150 Watt amplifier circuit
Low Cost 150 Watt Amplifier Circuit
Description
This is the cheapest 150 Watt amplifier circuit you can make,I think.Based on two Darlington power transistors TIP 142 and TIP 147 ,this circuit can deliver a blasting 150 W Rms to a 4 Ohm speaker.Enough for you to get rocked?;then try out this.
TIP 147 and 142 are complementary Darlington pair transistors which can handle 5 A current and 100V ,famous for their ruggedness. Here two BC 558 transistors Q5 and Q4 are wired as pre amplifier and TIP 142 ,TIP 147 together with TIP41 (Q1,Q2,Q3) is used for driving the speaker.This circuit is designed so rugged that this can be assembled even on a perf board or even by pin to pin soldering.The circuit can be powered from a +/-45V, 5A dual power supply.You must try this circuit.Its working great!
The preamplifier section of this circuit is based around Q4 and Q5 which forms a differential amplifier. The use of a differential amplifier in the input stage reduces noise and also provides a means for applying negative feedback. Thus overall performance of the amplifier is improved. Input signal is applied to the base of Q5 through the DC decoupling capacitor C2. Feedback voltage is applied to the base of Q4 from the junction of 0.33 ohm resistors through the 22K resistor. A complementary Class AB push-pull stage is built around the transistors Q1 and Q2 for driving the loud speaker. Diodes D1 and D2 biases the complementary pair and ensures Class AB operation. Transistor Q3 drives the push-pull pair and its base is directly coupled to the collector of Q5.
Circuit Diagram & Parts List .
- 150 watt amplifier circuit diagram
Notes.
- Remember TIP 142 and 147 are Darlington pairs .They are shown as conventional transistors in figure for ease.So don’t get confused.Even though each of them have 2 transistors ,2 resistors and 1 diode inside ,only three pins ,base emitter and collector are coming out.Rest are connected internally.So its quite OK to assume each of them as transistor for ease.
- Use a well regulated and filtered power supply.
- Connect a 10K POT in series with the input as volume control if you need.Not shown in circuit diagram.
- All electrolytic capacitors must be rated at least 50volts.
Power supply for this circuit.
A +40/-40 unregulated dual supply for powering this amplifier project is shown below. This power supply is only enough for powering one channel and for stereo applications double the current ratings of the transformer, diodes and fuses.
Power supply for this project
TIP 142 & 147 Internal diagram and pin out.
TIP 142-TIP 147 Pin Out Diagram with Schematics
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2. Headphone Amplifier Circuit – This is a simple circuit which uses only 3 transistors, that can be used to drive your headphone. It can be easily built by any one and can be powered using a 3 volts battery.
3. Mosfet Amplifier Circuit - This circuit is designed using two Mosfet’s and one transistor; which makes it an easy to build circuit. It can deliver 18 Watts output power to 8 ohms speaker or 30 watts to 4 ohms speaker; you can do it the way you like it. Another advantage of this circuit is the minimal use of components.
4. 40 Watts Amplifier using TDA1514 - TDA1514 is a high performance hi – fi amplifier from Philips. It requires a dual +25/-25 volts supply. Advantages of using TDA1514 are low THD, mute standby feature, thermal protection and other features. It can deliver 40 watts of output power to an 8 ohm speaker. You need a proper heat sink for the desired reliability of this circuit.
5. 2 X 32 Watts Stereo Amplifier Circuit – This circuit is built using TDA2050 which is a 32 Watts Class AB Audio amplifier IC (monolithic) . This IC has many features like thermal shut down, low THD, short circuit protection etc. This circuit uses Two of these IC TDA205o; one for each channel. An 18 volts dual power supply is required to power this circuit.
Pls sir can dis cct be used as a subwoofer amp? if yes den how…?
Hi you can use this amp as subwoofer amplifier. feed audio input to the amplifier through the sub woofer filter, appeared earlier as a project in circuitstoday.(sub woofer frequency will be in the range of 80 to 120Hz).
I have try this circuit and it works effectively.
We made the whole circuit.. And did the modifications as suggested in the link… http://pcb.jspayne.com/150wattamp.html But even with or without the modifications it is not working… We are getting 40 volts DC at the output of the amplifier… What do you suggest … And how do I check to see if the TIP 142 and TIP 147 is working… Please help!!!
Pls sir does the circuit need a heatsink?
yes the two power transistors TIP 142 / 147 need a proper heat sink…
TIP 41 does’nt need it
I used a 450watts-8 ohms speaker bt it rather got blown out. pls wat is the problem?
hi youngest C ……
We have built this circuit about more than 1000 times this works well and perfect..
If you are facing any type of problems regarding this circuit then you can contact us any time….. we are here for your assistance
We have a complete tutorial ( images as well as videos ) of this circuit’s building procedure…
If you are realy willing to built this circuit with perfection then contact us below given mail…. we are here to solve your problems… thanks , have a good day
Pls sir, its just 1 output of the amp, what abt d other speaker? tanks
hi ……
We have built this circuit about more than 1000 times this works well and perfect..
If you are facing any type of problems regarding this circuit then you can contact us any time….. we are here for your assistance
We have a complete tutorial ( images as well as videos ) of this circuit’s building procedure…
If you are realy willing to built this circuit with perfection then contact us below given mail…. we are here to solve your problems… thanks , have a good day
Pls, need a pcb layout for 150w amp
sir pls share PCB lay out and the analysis of this circuit 150 watts.
The 33 ohm resistance in the circuit where -45 volts is applied is burning out and glowing red hot… What seems to be the problem…
Hi Saha It looks like your TIP142 is dead short. Kindly do a cold check of TIP142 between collector and emitter. Anyway check all the connection ensure you start with a DC voltage of plus minus 30volt DC and an 8ohms speaker. If every thing is in order use 45 volt DC supply with 8 ohms speaker. Since this circuit doesn’t have output short circuit protection circuit built in, (as we have maintain least component count)hence use 3amp fast blow fuse initially in positive and negative dc supply line to protect the output transistors. Once the system is healthy replace the fuses with 5amps.
Thank but there seems to be another problem… I was using another pre amplifier with this circuit and I accidentally opened the connection for negative feedback thus increasing gain and bursting the 100 uF cap…Since then I am getting a voltage from ground…(i.e ground is at a higher potential)
And can you tell me a test to know if BC558 is fine and also can you suggest an alternative…
recheck the circuit if its on PCB …..
Hello every one i have made this circuit it is eorking but the output of this amp is very low even when i onnected a 12″ 150 watt speaker with 30-0-30 l5 amp transformer so could any one tell me how should i get full 150 watt output frm my speaker plzzz
sorry in the above comment i have typed 15 amp transformer but it is only a 5 amp transformer sorry for my bad typing
Hi Sagar what is the impedance of the speaker. it should be 4 ohms with 30volt supply to get 150 watts. input signal to the amplifier should be at least 600mV rms (line level) if it is less add a simple 10 gain pre-amplifier between source and the amplifier.
hi ……
We have built this circuit about more than 1000 times this works well and perfect..
If you are facing any type of problems regarding this circuit then you can contact us any time….. we are here for your assistance
We have a complete tutorial ( images as well as videos ) of this circuit’s building procedure…
If you are realy willing to built this circuit with perfection then contact us below given mail…. we are here to solve your problems… thanks , have a good day
i tried this 150w amp the first time with tip 142,147 and 41c it worked well but it is over heating.however i discovered that tip 41 and 41c are different in value so i am working on that now.
thinks its vry nice and helpfull circukts
Is this circuit gonna work even the other components here http://pcb.jspayne.com/150wattamp.html are not placed? Thanks in advance!
i also want to know if it can work even if the supply is less than 40. tnx
‘
sir , i just want to ask if this circuit can amplify inputs coming form mp3. and if this is mono-channeled
tnx
HI NEED TV CIRCUIT
Sir, Assembled the circuit for 150w power amp,it did not work.we are getting only humming noise. Initially DC supply connected was 17V dc dual supply for try out.is it necessary that max volt to be connected.what may be the reason,out put base voltage is max(13v) on both 142 &147 power transistors.would you kindly let me know the reason also please forward ref.voltages.
Regards kindly reply\Chandrashekar
Thanks to u guys for the education. l want to try my hands on this Amp (150 W) and want to ask, does TIP141 transistor the same as the TIP142 transistor in this circuit? And therfore can l replace TIP142 with TIP141?
plias tell me nomber transistor sacet 207
pls mr i need to sarcet diagram sherwood amplifer model no ra-11114t prias help
hi can any one tell me that if i use this amplifier with 4ohm load then ???
hi, this amp cannot support the 4 ohm load because it has only two transistor at output.it will overheat on 4 ohm load and will burn.at low bass it will be ok.
First of all, sorry if this is a stupid question. But I’m total newbie on audio amplifiers! With that said, now to the question:
I have a couple IRFR2497, can I use this layout and replace Q1 to Q5 with those? I understand that I might need to have different values on resistors and such.
Kind Regards
Christian
i would like to know the wattage of the other resistors
please share the information related to digital storage oscilloscope….
https://www.facebook.com/auxtics
see this amplifier working in stereo mode.
sound is amazing and mirror cracking…
Questions related to this design will be answered here. thnx
Hi Seetharaman,
I’m planning to build this circuit. Since I’m going to make a stereo, I need to double the power rating of the transformer. I’m planning to order a 30-0-30 10 or 12A transformer. Could you please let me know if that will be enough? If that’s the case, more importantly, I would also like to know which diode I should use for the bridge rectifier. Can I use two P600A in parallel? what would be the voltage drop?
hi all, i have built this amp 7 times, each time i am left with an amp that has fail each time with +v rising to full psu volts the neg supply dies to 0v. the speaker 0 volts has half volts at this point. the – supply falls to zero. the npn o/p device has on, 3 times blown its guts out. i found a circuit by vellman 100w 200wmp kit and noticed that the 150w amp is a stripped down version of the 150w one. i am a electronic design engineer in the u.k. and notice that using a scope i have found that this design is as stable as a brick in custard, sorry guys, but with all the mistakes in and on the circuit it shoud have been fully noted with corrections and fully tested BEFORE it was issued to the net. i have never found a circuit to SO DODGIE. and released to the public.
Unless someone can save this amp from distruction each time i conect it to a power supply i would all avvid builders to not to bother with this design. i have used a power supply (dual) +/- 2v to 100v this amp has failed at +/- 15v @6a and it still blow up ? my fear is regardless of layout(s) and i have tried 4 different methods and layouts including one from the original pictures AND IT STILL BLOWS UP?
THANKS TO ALL FOR READING THIS AND IF THERE IS A CURE FOR IT PLEASE LET ME KNOW
can i use a 30-0-30 v 8amps trafo for a stereo amplifier?
you can use but ensure that for each channel positive and negative bus add a 3A fast acting fuse to protect the output transistors against load short circuit as there is no protection circuit included in this simple design.
plias tell me oll transistor use for this amplifier
Hi, I’m here to find transistor tip 147!
The type of transistor, the transistor, which is the same.
I am Iran
Two’m Goodbye
This is just a quick answer.
**
Similar tip147 transistor is?
I had been adding BD 139 and 140 to my second amplifier with TIP 2955 and TIP 3055 AND ITS WORKING GREAT when i convert to stereo its working great,thank you for this site,I learned and gained more knowledge about amplifier…
can i have the data analysis of the circuit because my friend asked me why did i use BC 558 and not other kind of transistor i didn’t find an answer can you help please?
you can use other transistor but this is good and cheap.if your friend is intelligent then you can ask to him for other transistor.
Dear sir,I did this ampli but I have a problem, that in the entrance of audio I have a wave signal (12V, f = 1Hz), but I obteint in the output of the amplifier square signal ? why? it’s logic? please advice
Atlast i had been enjoy my amplifier using BDW 83c and 84c with Passive Baxandall Tone control its working great. Now i assembled another amplifier using TIP 3055 and TIP 2955 its working great also,,,and i plan to add another transistor using BD 140 and BD 139.,,hoping it will work soon
well hello Mr.prudencio g. peritos jr could you post your amp ckt video plzz , i have done this amp ckt but it’s output sound is very low could you plzz guide me( i have used 30-0-30 ,5 amp transformer also but it’s output is less)
i want high bass audio circuit board.
rohin.sharma83@yahoo.com
Hello again! My TIP41 is overheating and suddenly my R10 (33 ohm) fried/busted. Please help me.
tnx!
change your tip 41 and r 10.check your all connection.for help contact me by email .rohin.sharma83@yahoo.com
Thank you very much, sir! The base and collector of my tip41 was shorted
Sorry for late reply. Now its working! Thanks again!
sorry for mistake.http://pcb.jspayne.com/150wattamp.htm
Sir, deadlink?
link is not dead there is some mistake.copy this address and add l in the last. http://pcb.jspayne.com/150wattamp.html
hi to everyone,For pcb of this nice amplifier is available. http://pcb.jspayne.com/150wattamp.html.Don't use update version.
Can i use 1 heatsink to transistors; tip41, tip142 and tip147?
sir robin just a little bit correction to my email add and this regards with the PCB of the 150 watt power amplifier circuit i am asking to please send me a layout, thank u & more power
jsl_7458@yahoo.com
12 December 2010 at 1240H
a very nice circuit and thank u so much for sharing! by the way sir robin can u pls share me a PCB layout of the 150 Watt amplifier circuit. Thank and please, more power and GOD Bless…
sir pls share PCB lay out and the analysis of this circuit 150 watts,., nusoncar@yahoo.com
Nice one circuit, thanks for sharing it! By the way cAn anyone send me the pcB layout for this circuit.. Thanks again.! God bless!
My email – erm.sk8er@yahoo.com
Im having a hard time looking for a 120V to 30V step down transformer for this circuit. Can somone please tell me where I can find these components? Post or send a link if possible please
what is the basics theory to design such type of circuit?how shall we start to think to built such circuit if we beginer of electronics?…which comp. is required or not?..how can we justify which comp. is connected at perticular place.if i use 4 darlington then what happen if any link there to know about these plz tell me.
pls sir i need a circuit diagram of audio receive,
hello Mr. Seetharaman
well i have gone through your circuit and its quiet intresting so i have done it on a pcb but it aint working so could you help me how to check it or what to do plz….
Hello Seetharaman sir!
it very interesting working on this circuit.
Sir i have used 32v-0-32v 8amps transformer for this circuit you have mentioned to use 30v-0-30 3amps transformer but i am using 8amps wil it create any problem?
and in this circuit the output terminals from pcb is having 46v when checked with voltmeter when checked with no input,
your transformer is ideal for this circuit.after rectification you will get 45v which is good for this amplifier.
thanx bro i sent you an email with the link which i got the PCB layout,,,hoping your reply soon with you suggestion or advise
You are right Rohin,,when i checked the output with the tester ,i put it at 250 volts,,and i found out that there’s a voltage came out…that,s why the music is not clear…I add some 2 resistors and now the diction is clear alredy..i used 16 sqr inch heatsink because the Q1 is so hot,but the Q2 and Q3 is normal,..can you suggest me regarding this problem, please,.
I used TURKISH PCB Layout,,,using BDW83C and 84C,,with TIP 41 and BC556…with POWER supply of 24-0-24v,6A…Please suggest me regarding the Q1 is so hot…Longing you reply soon.
hi bro, as you said that there is some volt on output so there is some fault in you design. you used good alternative transistor so problem is not due to alternatives transistor.if your q1 is going hot n hot it will blow after some hour.first wash it with thinner then check polarity of all capacitor and good look at ground pin.you please give me link of pcb layout and component list that you used in your circuit because my guess is that you didn’t wrong anything problem due to any wrong component and wrong value resistance.my email id is rohin.sharma83@yahoo.com.
Thanks rohin ill check it…and you will know further
can any one please send me pcb layout of this circuit
at
” alamisdecent@gmail.com“
Sir, i have done already assembled this amplifier, using BDW83c and 84c, it is very loud but the diction or wording of the music is not clear..and Q1 is very hot even I am using 3″ x 3″ heatsink…please help me, what shall I do regarding my amplifier..
Hoping your reply soon. Thanx.
dear bro ,i already made this amp. amplifier is beautiful and clear sound and loud too.it seems that there is something wrong in your amp. R2 should be 220 ohm.if everything is fine then problem is due to alternative transistor.and made this amp as it is.don,t use its updated version where some one put more components like pf and resistance. check the output of amp with multimeter put the scale to dc 200v plus and it should be zero.if there is some volt then you did something wrong.
hello sir i have build this amplifeier with 24v &1amp transformer and there is too much distortion i use speakers of 35 watt 6ohm
please answer what should i do?
sir why does the sound not amplified?? i change all the transistors that i use. what should i do???
if you made it on pcb then pcb may be short one track to another or your flux is not removed on pcb .wash it with thinner or if you made this amp with additional component like pf and resistance then remove them.their is minor fault in your circuit or you fit wrong way any component.
hi sir
can you please tell me how to convert this amplifier into stereo?
hello sir,
what transistor can i replace TIP 142 and TIP 147?can i replace also
TIP 41? for matching Q1, Q2 and Q3
i used 45v vdc and i have a pre amplifier connected in a 150 watts amplifier. then i try, the circuit is good and theirs no problem on it . but i confused i try to volume at 50% with a load at input at no power then i turn on the fused blow out together wid tip 142,147 whats the problem on it sir?
HI sir i have a 142 & 147 with amplifier,when i playing this its too hot.can i chenge 142 & 147 to tv’s power horizental transisters like sd1410,sd1550.Please reply.
TVH-out is not a darlington transistor and it is low current and high voltage drive transistor. You have to try with larger heat sync and cooling fan can apply. in other hand you have to replace 142 & 147 only with darlington types.
Hi Chhotu The power is RMS voltage available across speaker terminal, V square / speaker impedance. It is clear that for higher power you have to raise the voltage or reduce the speaker impedance. your heating up may be due to higher no signal current for the output transistors, chech the D1 and D2 loop.
sir please tell me how you decide the output power as here you have said its cheapest 150 watt amplifier circuit.
Basically output power is depending on the supply voltage and impedance of the speaker. P(out) = sqr(V-10)/R.
V: supply voltage (45v)
R: impedance of the speaker (8Ohms)
here 10 is the voltage drop by the darlington.
you can increase the output power by reducing the R or 10.V
to reduce the 10V drop you can apply more output darlington in parallely with 0.33/7W resistors.
Good day sir, I built 3 of this wonderful amp without any problem, except for the “excessive heat” of the Darlington pair. I used a fin type 3″x5″ heatsink for each transistor. I know I can use a bigger heatsink but my question is, what causes the Darlington pair to “overheat”.
Pls. reply to my e-mail…..
Thanks and more power…
sir i have a 44v-0-44v 5a tranformer . After using capacitor 60v-0-60v is available ,i can use this circuit for this psu?
hey prithvi, go ahead do not worry about supply. you can use this t/r. but take care that you have to use filer condencer of 75 workig volt.do not forget it.it is better to use instead of 63 woring volt cond.and one more thing ,use 33 ohm one watt resistences as a current limiting resistences to connect positive and negative supply of an amplifier.if you do not use these resistences then both the tr, tip 142 and tip 147 blown off in less than a second. because i have tested this amplifier today.it works well.
Manohara, applying 33 ohms resistors is not recommended. because the power amplifier is consuming variable current while it is working. so voltage drop across the 33 ohms is variable. Think the amplifier consuming about 1Amp current. so voltage drop across the 33 ohms is (V=IR) 33Volts. the power supply is about 40V the voltage of the amplifier is about 10V. So this is not the right way. Prithvi, I recomended you to increased voltage of all the capacitors up to 70 volts or more. and Vce of all the darlington transistors should be at-least 80V. Vce of all the other transistors should be at-least 120V.
thank you for reply .i was waiting for the reply for 3 days after that i tried it from 32vac to 56vac(45vdc-79vdc) from a 550va 8 kg transformer and i used 4 transistor per channel, my two 120mm 8” speaker’s blown . But transistors are fine ,this amp pays back every thing with less hifi quality.
Hi prithvi all the transistors may blow up. Never use higher than 30 – 0 – 30 Volt RMS @ 3 amps transformer.
sir i have asked tis que. bcos i have spent time and inr 2k for making 44-0-44 5a with auxilarary winding 12v 2a transformer . I have used parallel 142 and 147 with no problem or blowing of transistor and i used bc 556 for pre amp.
sir? if rectifier diode in the power supply is 6A05. its okay sir? tnx sir and God bless always^^
Hi Rey use 6A10 6amps 100piv rectifier
Hi samshith,in reply to your request.I am happy to announce to you that i can give you all necessary information you need on this amplifier circuit and other audio system information.I am the MD/CEO of my own electronic fabrication centre,I have trained alot of people and also written some book on sound system and electrical gadget.Should you are interested contact me via my email.
statement: design an audio systm f a fitnes clb f an area 700 sq.feet with glass windows and conseald sealing with following specifications
instruction mikes,cd/dvd player,appropriate signal conditioning ckt,suitable pre and power amplifier ,7 band grafic equalizer,volume control,tone control,sound level indicator,distortion cancelling ckt,power supply with sht ckt protection and power on indicator,speaker should be column and sealing ,mixed arrangement.
drawings:
amplifier enclosure ,half schematic ,sample drawing of sealing and column speaker,connection diagram….
please let us no it………..by tomorrow….it’s very urgent sir………..help us….it very urgent……….
sir, as per power supply diagram c1 and c2 is 4700uf,,,c3 and c4 is 100nf,,,100nf is no available in our market,,,what capacitor shall we replace this 100nf capacitor? please confirm…thanx
the minimum of C1 and C2 should be 4700uf electrolytic and c3 and c4 should be around 100nf and should be in Mylar type. (68oouf, 10000uf also better for steady current).
c3 & c4 are acting as high-pass filter and reducing high frequency oscillations in the power supply. any value between 0.1uf (100nf) and 0.22uf (220nf) are ok for c3 & c4 (both c3 & c4 should be same)
hi sir, 30-0-30 volts is not available in our market, can i used 24-0-24 volts transformer 6A ?,,thanx
The supply voltage is important factor of output power of an amplifier. There is no doubt to apply this transformer to this amplifier. only thing is the output power will be low than the given value.
YOU CAN,BUT IT WILL GIVE LESS AMOUNT OF 150 WATTS
Sir, thank you so much for answering my comments… Have a nice day,,,God bless you
Hello sir Seetharaman, I’m from Philippines, Manila I would like to ask if what speaker should I provide building this amplifier using all same active and passive components except that I’m only using 4Amp 30 – 0 – 30 transformer.
I’ve just build this right this morning and it seems working fine without smoke appears only that I don’t have a speakers yet. I’m a Student!
Thank You Sir!
Hi Ljay. You can use 100watts 8 Ohms 12″ full range speaker, in an air tight 65 litres inner capacity enclosure.
Hi Ray use 6A10 to be on the safer side.
I tried this circuit with several darlingtons and three way speaker system. also I applied integrated speaker protection circuit to the output of the amplifier. it is recommended to transistor amplifiers because to protect the valuable speakers. the amplifier has very good low frequency (bass) response and it is recommended to apply good low pass filter at the input of the amplifier was trying to oscillating at high frequencies. I thing it is good to apply two way or three way speaker system with good bass woofer rather than a full range speaker. you can also apply a good cross-over circuit for hi-quality music response.
Hi Prudencio By keeping the flat surface dowm and ensuring that the pins are pointing to you. Left side pin is emitter center top is base and right is collector.
i’m olso interested on constructions of amplifier circuit, but i dont have enough basic obout transistors. i’m doing electronic 2 in computer system engineering. so can you please help me to find more information by sending me some simple circuits to construct.
The designed is ok d output power is recommented.the heating effect is mush as power suply increases what could be done to use circuit at +70 & -70volt look forward to hear from you.mail me dialinton power transistor that can withstand 80volt
Hi Togor,concerning your request contact me via my email.I promise to give you better power darlington transistor that can withstand 100 volt and 45 amp.Am MD/CEO of BODNIK TECHNOLOGIE VENTURE here in Nigeria.And i specialised on sound system fabrication.
sir, can you give the pin out of this transistor BC 558,the store did not give the pin out,,,im beginner,,,thanx
PRUDENCIO,YOU PIC THE TRANSISTER BC 558 ,UP SIDE THE CASE AND FLAT SIDE OF T/R IN FRONT OF YOU & LOWER THE SIDE THE PIN OF T/R, THEN THE RIGHT PIN IS EMMITER,THE CENTRE IS BASE AND THE LEFT ONE IS COLLECTOR.
thanks sir……
Hi Pankaj 12″ 150 watts woofer is best suited in an air tight enclosure, with an internal volume of 45 to 60litres.
süpperrrrrrrrrrr power supply
sir can I use a 12inch 150 watt sub-woofer driver with this circuit?????
Thanks a lot sir for your support and help.
Hi Samshith 63 volts or higher.
Hi Pankaj why not? you can use with the sub woofer filter appeared earlier in circuits today
http://www.circuitstoday.com/low-pass-filter-for-subwoofer
Hi sir if i build this amplifier in two channel it will work or not? Plz reply..,
bert from mindanao, philippines..
–
Via MebApp.com
sir, i would like to made it. So help me. I want to know capasitor4700uf volt?
Dear Sir.
i am happy to get in contact with you, please i need your help concerning this amplifier, When i assemble the amplifier in Mono, it works well, but when i make it stereo, the left channel or right channel will not work, i inter changed all parts from left to right, one chanel still maintain this fault, Please what can be the solution to this? do i need to assemble a split power supply using the same transformer or two transformers for this amplifier, then my second question is that, can i bridge this amplifier to Mono to get more power out-put that can drive my 4 pieces of 21Inches speakers for commercial use? please my email address is(dnkwenti@gmail.com) any help from members here would be appreciated, i am happy to share with good hearth people.
Thanks
sir please help me I want to use this circuit for subwoofer how can I use it??????
Can I use a low pass filter??????
if yes then please provide me the circuit diagram….
Hi Spharow with 24-0-24 transformer with 8 ohms speaker the output power will be around 60 watts. You require an input of not less than a signal level of 250 mV. Use a pre amplifier with a gain of 10 to 25.
But having this 24V 0V 24V is not loud enough for me to play my e.guitar?what’s the power of the speaker do I need to use?Or do I need to put preamp before it,plz repz…
Thank you so much, I already found out the fault. The positive line of the of the speaker is shorted unto the ground..tanx..:)
Hi sir, good day.
If I build this amplifier in stereo it will work or not?
please reply.
thank you.
–
Via MebApp.com
Hi Sir its my desire to work on this circuit very soon,please send me this page in my email to facilitate my study and reference as i work on the project.thanks God bless
I have done this schamatic but went i combint the p.supply on power Ac…the
Power ampl. Have sound sudenly for a second sound stop…just hear the voice tottt………
Thanks for the good work,
Thats very powerful amplifier.
I’l try to construct it coz it is visible and understandable,
God bless you keep it up to assist us as student.
hi! sir, can i ask? what is the wattage value of all the resistor and the voltage rating of all the capacitor’s?
Hi Ramdas I have sent the email it had returned. send your letter to my email id seethasub@hotmail.com
Dear Br. Seetharaman…I have 2 requests
1)I want to assemble this 150W amplifier (TIP142/147)..But from where I can get the PCB layout or readymade PCB kit…
2)Can u please sent me ur email address..cause I have one old Tone control PCB by Visha electronics..of the circuit published in Elektor India.long back..i think in 80s.I dont have the circuit diagram..if i have ur email address I can attach the photograph of the same for ur kind perusal…I tried a lot for this..pls help me out..
With hope..
Ramdas.(n.ramdas@yahoomail.com)
Hi Anbu please go through the following link
http://pcb.jspayne.com/150wattamp.html
how to assemling this cuit
Thats very kind of you sir, you’ve been a blessing to us.
Hi Tosin they are power Darlington transistors with freewheeling diodes and currnt limitting resistors. You can fabricate then by using TIP2955/ TIP3055 matched pair (Any High Voltage high power)output transistors with BD140/BD139 (any high voltage medium power)with IN5404 or IN5819 as freewheeling diodes .
I want to know if there are other transistors which can replace tip142, tip147 in the diagram because these ones are not available in my area now. Thanks for the good work
Hi John you can use 10KuF 63 volts in each supply line. (both positive and negative voltage). You can always use a higher power amplifier with a little lower power handling capacity speakers, nothing will happen. The other way, the distortion generated by the lower power amplifier can damage the voice coil of the higher power speakers.
thanx a lot sir,,,MAY GOD BLESS U
is it ok if i used a 80 watts amplifier to 150-200watts speaker ??? thanks
can we use a 10k uf 63 volts capacitor in the power supply?
Hi Rusty TIP41 is NPN, which is required here. TIP42 is PNP with which you will blow the output transistors.
HELLO SIR this circuit work or not… plz
THANASEKAR,I HAVE TESTED IT EARLIER,IT WORKS GOOD.
MADE PC BOARD AND ASSEMBLED IS Q3 A TIP41 OR A TIP42. WHEN SWITCHED ON
3WITH 25V SUPPLY Q4 AND Q5 BLEW ANY IDEAS PLEASE.REGARDS RUSTY.
Hi John no need to use screws just slide on the clip.
what is clip on ?
thanks a lot bro ..
Hi John it is a must, for TIP142 & 147 you require a large extruded alloy heat sink. for TIP41 a clip on will do.
Good day , I have Query, Ive biult the 150watt amplifier but have a problem. In the write up it calls for a TIP42, but in the diagram it calls for a Tip31. when I connected up with Tip42 r4 burnt up including Q4 & Q5. on replacing them it burnt Q2 ,Q3 Q4,Q5 R10, c2.
I had a30volt supply. could you throw some light on this.
Regards Rusty. rhearder@intehom.co.za
its TIP 41
heatsink for the three TIP are needed??? please answer thanks
Hi Prudencia please refer my earlier comments on this
December 15, 2011 at 9:46 am
hello sir. as per diagram Q1 is TIP 41? or TIP 141,,likewise the capacitors ,the volt was not given for every capacitor listed in diagram,,,
heatsink is needed for tip142 tip147 and tip41 ??what kind of heatsink is it??
Thanks seetharaman..
Pinoy ako
Hi Many connect a 22k or higher value potentiometer for volume control. Connect one end to 0 volt line and the other end to input and potentiometer’s center pont(slider) to audio in of the amplifier.
tnx seetharaman, i using for my mobile sound system big horn tweeter if you have more compatible amps for tweeter can i request more fabor.
Tnx and more blessing to you and CT….
Respectfully yours,
GILBERT
PHILIPPINENS
how are you to connect the variabel resistors to vary the volume
Hi Gilbert reduce C2 from 10uF to 1nF. Add a 47PF from Q3 collector to base. Why do you require so much for tweeter power?
Sir Seetharaman
A nice day, if I use for tweeter power amlifier this circuit what is the modification.
Tnx alot Gilbert…
Hi John with low value potentiometer while it is set at extreme ends will get burnt, hence a fixed resistance is preferred.
thanks seetharaman
no potentiometer ?
Hi John you can use 3nos 1 ohm 2 watts (which is standard and freely available)resistance in parallel to get 0.33 ohms 6 watts.
what if r8 and r9 is not available in the market ? what should be replacE ?thank !
from the philippines PINOY !
Hi all capacitors should be 50volts or higher
in this schamatic 150w ampl. the all capacitor did’t swo how much volt u can put?c1,c2,c3……including the power supply c1,c2,c3,c4…..all this capacitor did’t swo how much can put?pleeeseee…….imfom. me…this ergent!!t.Q…
can i use 6A in transformer > the value of others will affect ? help me tnx
what is the voltage of 100nf ?? thanks …
what should be in AUDIO IN ?? beginner thanks
how many watts in R1 , r2 , r4, r6 , r7 and r10 ..thanks
BRIAN,R1,R2,R4,R6,R7 CAN BE USED 1/4 OF WATT BUT R10 SHOULD BE OF 1WATT.
seetharaman sory for asking you a lot of cuestions but i measured 75watts into 8 ohm load.if i use two pairs of tip14x conected in paralel i will take 150watts rms ito 8 ohms?thanks for your help!
thanks circuittoday, I’ll try to my project..
Hello sir I am having some douts…….
1. I am having a (24 w 4ohm)*2 speaker,is dis circuit suitable for powering it
2. Normally in stereo circuit we hav 2 inputs (R&L)but in dis circuit i can find only one.. So do i hav to make 2 circuits for stereo output I.E (150w circuit * 2)?..
thank you seetharaman!
Hi Panos you can use any tone control which uses plus and minus supply similar to our Passive tone control, which is most suited for this project.
http://www.circuitstoday.com/passive-tone-control-circuit
hi sir i made this circuit.its working grest!!can you sugest me a tone control circuit for this amp?
Hi Rush you can use two capacitors in parallel. it will suit. you can use ceramic or polyester capacitor rated for 50volts or higher
Hi sir,
Plz suggest me about query posted on February 13, 2012 at 8:12 pm
thanx a lot
Hi Spharow check the bias diodes D1 & D2 direction, the end with a white band is cathode.
Have you insulated Q1 & Q2 from heat sink with proper mounting kit.
I’ve assembled it but the moment i run it, the wire from power supply(+) is melted and burn the wire..(0) is on the ground and (-) is on the collector of tip147..I’m just using 24v 0v 24v..what’s the problem?I’d rechecked it over and over again but the circuit is just rightly connected..
Hi Tmaxx226,
The 300VA transformer should do just fine for the stereo application, but I recommend using the 500VA instead, having a little more power than recommended is always better in amplifiers.
any circuit available which converts from 60 W audio o/p with 16 ohms res to 150 Watts 16 ohms.
seetharaman,
Will a 300VA 30-0-30 toroid transformer produce enough power for a stereo application of the amplifier? Or would it be best to use a 500VA transformer? Thank you for the help!
Hi Sir,
I have done my 150W amp as per ur instructions and its working gr8.
Sir, now i going for subwoofer low pass filter shown in http://www.circuitstoday.com/subwoofer-amplifier
But, as per ur suggestion for 0.18uf(C1)we can use 0.1uf & 0.082uf in parallel. So,please let me know which type capacitor i can use for 0.082uf? Is it disc type?
Thanks again…………. Have a nice day..Happy valentine day….
Hi Sir,
I have done my 150Watt AMP as per your instructions and its working fine.
Thanks for your help.
I want to assemble subwoofer low pass filter shown in http://www.circuitstoday.com/subwoofer-amplifier
But, i didn’t get 0.18Mf(C1)in market.So,
As per your suggestion for 0.18Mf we can use 0.1Mf+0.082Mf.
So, please let me know 0.082Mf is which type of capacitor? Is it disk?
Hi Jam +45volt should get connected to TIP142 collector and -45volts sholud get connected to TIP147 collector. zero should be connected to terminals shown as earth. (speaker’s one end, C3, R7 and input common terminal)
hi sir, just wanna ask.. on the circuit proper, where should we connect all of the ground? and also, should the -45V be connected with the grounds as well? pls reply. thanks.
One last (possibly stupid) question.
I’m making it with 2n3055/MJ2955 darlingrons. Their rated power is 116W 60V 15A, the rating of the TIP147/142 is 100V 10A 125W, so will there be any drop in the output or will it increase/remain the same (my guess is drop)? Or will the output impedance handling change? (Will be used as a driver for a sub, the sub is 250W rms 4 ohm). I’ll be using a 45-0-45 ~10A supply.
Thanks in advance.
I assembled two units for stereo but every time i test it, one unit blows!!! I tried to separate their power supply but still the same…( I already busted 10 pairs of TIP142 and TIP147) I continued troubleshooting but I can’t find any defect in the circuit,The latest part replacement of the Darlington pairs were OK, I guess I must have bought fakes TIP 142 & 147….
The sound is good. I used this this Ckt. to drive my Subs and center speakers….. I’ll send some pictures later….
Hi Rush the PCB shown is perfect the layout is also correct you can go ahead.
Hi Panos the maximum output with +42-0–42volts DC can produce 200watts into 4 ohms load.
Hi Noel 4700uF can be 63volts DC or more. C1 & C2 & C3 can be 25 volts
HiToC use 2N3055 MJ2955 with BD139 and BD140 as darlington.
1. can’t u give the condenser What volt in use=4700uf ?v
=C1,C2=10uf ?v
=C3=100uf ?v
2. the transformer 5A can use more then 5amphere?
Will this work, because i’m too lazy to go out and buy the TIP142,147 now, won’t making it with 2n3055(I know 2n3055 is not darlington but I’ve added another transistor to make it like that also without the other transistor it will work too) darlington do it? (of course 2n3055 with MJ2955)
hi ser,i am panos from greece and i want you to tell me the maximum rms watage i can take of this amplifier.
hi sir,
i try this amp. I’am very sad this is not woking.
D1 and D2 and R5and R3 is very very hot
sir .. for this circuit that you posted is it necessary or do we need to add an preamplifier ? if yes how ? thanks
Sir….. If i using +/- 50 volt DC power supply its need to be change R6 value??
sir can i connect another pair of tip142 and 147 in a parallel connection. what will happen the rms will be increases? thanks
Thanks a lot Sir
can i refer below mentioned URL.
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=6&durum=e#sonyorum
Thanks again & sorry for continues asking questions to you……
Hi Rush007 TIP142/147 pair output is limited to 150watts maximum into 4ohms load with +35 0 -35 volts DC and around 100watts into 8 ohms load with +42 0 -42 volts DC.
BDW83C/84C 150watts into 8 ohms with +52 0 -52 volts DC and 250watts with +48 0 -48 volt DC.
Since peak current is going to be quite high layout and the gauge of wire used are very important. Please take care.
Sir….. actually i want 150Watt RMS(on 8Ohm)& 300Watt RMS(on 4Ohm).
can i get this by using BDW83C / 84C pair.
Sir…How many RMS output can i get from this circuit for 4Ohm/8Ohm woofer with using BDW83C / 84C pair instead of TIP142/147 pair which suggested by you. Have A Nice Day.
Thanks a Lot sir………Ur Gr8.
Hi Rush007 no need for any other modifications, just replace the output transistors with a good heat sink.
Thanks very much Sir………but let me know what changes needs to do in original 150W circuit with BDW83C / 84C. Have a nice Day……
Hi Rush007 you have to use >150 watts amplifier for good transient with 150Watts speaker (always use an amplifier with a speaker with less capability, with higher capacity speakers the amp distortion will be transferred to speaker and damage it) . Use DC 50-0-50volt 3amp power supply and use BDW83C / 84C pair for the output, with good large heat sink.
you can use the sub woofer filter appeared in our projects
http://www.circuitstoday.com/subwoofer-amplifier
No PCB layout available you may use standard universal boards.
Thanks for response sir…..Request to you please give me suitable sub-woofer filter or sub-woofer output pre-amp circuit diagram for this 150 watt Amp.
And sir what is the recommended sub-woofer and DC +/- Volt for this 150 Watt circuit because my requirement is to use 12″-150W-8Ohm Sub-woofer.
Thanks Again sir….. And Wish u Happy New Year.
Hi Basi +40-0–40 volt DC not AC. AC 30-0-30volts
Hi Rush007 you can use with a suitable sub woofer filter or the sub woofer output of pre-amp / amplifier
Sir, Can i use this AMP for my sub-woofer(12″-150W-8Ohm)
Please suggest me..Thanks.
Hai seetharaman..
Plz help me..
I have used irf250 4 mosft pwr amp volt why..?
Hai
40 0 40 AC volt
DC ???
thank you sir seetharaman……….,i will do your advise…
hi, sir thanks. the circuit was great. but if you use 8ohms speaker the output of 150watts rms, it become 75watts rms. in mono. thank you sir you are great.. if you have a 1000 watts rms pls send me thans hers my email normzhie@yahoo.com
Specify the speaker, How much inches?
Power full Amp-
thanq!
Hi Bose you require smaller clip on heat sink for Q3, and extruded alloy heat sink of around 16sq inches for output transistors Q1 & Q2.
this is helpful
sir is heat sink required for the transistors ?
thanks seetharaman
Hi Bose you can use 0.47 ohms 5watts resistance. for 4 ohms speaker better use 0.33 ohms, this can be achieved by using 3nos 1 ohm 2 watt resistances in parallel.
sir i dnt get the resister 0.33 ohm what can i do ,can any other resister is enough or else .33 ohms is required
thank u,
Hi Bryan it is working great. please go through all my comments. Q3 should be TIP41 NPN transistor.
Oops, finally it was working awesome….
But there was huge distortion when connected (just connected but not played any music ) to the computer output directly without a pot.
Is it normal with this Amp or is there any mistake in my construction. I have used 10000uF caps as filters.
And I was also tried with 24-0-24 transformer, but the problem still exists.
Hello sir,
I have built this circuit, but when I have checked the output voltage it was displaying around 110 volts at 0 input signal btw I was running on 40-0-40 transformer. when I have connected my subwoofer the diaphragm coming out from its neutral position and stays over there until I turned off the power supply.
I have rechecked the circuit many times every thing was ok, and replaced all transistors, but the problem still exists.
Any idea on this.?
sir can you clarify the Q3?….cause in diagram its TIP41 but in the description above its TIP42!…thats all sir!!!tnx……..
CAN I CONNECT A TONE CONTROL HERE SIR?….ACTUALLY I AM FROM PHILIPPINES…………
HELLO!….I WANT TO BUILT THIS CIRCUIT….I JUST WANT TO CLARIFY IF THAT CIRCUIT IS WORKING GREAT!??……TNX….
Hi Pekka Langer you have to use 30-0-30 V RMS AC @ 5 Amps secondary transformer of good quality.
And i got it wrong again… not 60-0-60vac.
Sorry. i meant 30-0-30 vac and 60-0-60 vac
i was thinking about rewiring the secondary on a microwave oven transformer, how many amps would the new cable in the secondary need to be rated for 35+35 vac.
5A on 35vac or 5amp on 90vac ?
a fitting transformer around here would cost about 100euros
Hi JRY all ceramics as per PCB are required for the stability of the amplifier. The circuit is the basic one for good quality components and layout. since both are not practicable you have to add these components to avoid the shortfalls
tanks!
it’s good circuit!
it is working as my hope thanks
Thanks Seetharaman! That did the trick, I love this amp, works perfectly.
@ seetharaman base on your schematic dia. you have C1 TO C3 but on your pcb layout you have C1 TO C11,, ceramics is not included on your schematic dia. it is nessesary or not
Hi Tomy it looks like crossover distortion. may be at high volues it is sounding clean and at low volumes it is having distortion. If this is your problem, when your out put transistors are highy mismatched this happens, you can reduce this by measuring the output tansistor collector (any one) current and raising it to 50mA, if it is too low by including a 1/2 watt resistace of 10 to 27 ohms between D1 and D2 such that you achieve the results. do not exceed 75mA.
Hi Seetharaman,
I really like the simple design of this. My problem is distortion that is coming out if I try to lower the input signal with any resistors. I’m using this amp to power a 4ohm subwoofer. I have the amp connected to a line level low frequence output of my main amp. I put this amp together based on the exact components that you recommend. I connected 0V to the chassis ground (close to the transformer). I have also connected input common to the same ground point. I’m using 16gauge or larger wires and bus perf board. I can not hear distortion if I don’t use any resistance on signal input. If I try to put 3K normal resitor or 50k pot to the input signal, I get distortion. I have also tried to connect 220PF and 1000PF disk capacitor between the input signal and ground, but no effect. I’m doing probably something obvious wrong, but I just can not understand what that is…
Your help would be highly appreciated.
thanks also to SEETHARAMAN for the ground detail..
this amplifier is 100%
This design actually work..
I followed every steps and it worked..
thanks…
I have now an amplifier that has a very clear output.
nyahahahaha
Hai sir
Thanks for your reply
Hi Joy AC RMS X sr. root 2 will be the DC output without load (DC output = V RMS X 1.4.14). With load it dpends on the regulation of the transformer. hence with 32-0-32 you will get 45-0-45 volts DC.
Hai seetharaman
I woud like the 100 watt rms Poweramplifier, I can use 32 0 32 ac out put transformer, how much dc volt will come the rectifier out put.
thanking you
Hi Johnda ground should be connected to 0 volt reference supply as there are both negative and positive voltages are used to energise the amp. please refer to amps power supply circuit
Hi Navales you have to use only darlington transistors in this circuit. with regular transistors it will work in low voltage as you raise the voltage the no signal current will increase to full rating and beyond and destroy the output transistors. you have to adjust bias etc, which is a the basics. try to use the published circuits as it is for positive results as the published circuits are well tested.
I have changed the 2 power transistors to a1904 and 5198, a 500 watts power transistor of KONZERT amplifiers then it works to a supply -12 o +12, but during the time I powered it into a -30 o +30 volts… 5A fuse blows… now my question is… what is the difference of tip darlington pair transistor among other transistors? if there is a replacement for that tip transistor that is cheaper than tip… can you please tell me or send it to my email..navalesaryan@yahoo.com. i need your help… thanksssss… your reply is highly needed and appreciated. good afternoon.
uhhmm…
im still new in making amplifiers..
my problem is the power source..
where would put the ground?
I think its not in the negative
in this schamatic 150w ampl. the all capacitor did’t swo how much volt u can put?c1,c2,c3……including the power supply c1,c2,c3,c4…..all this capacitor did’t swo how much can put?pleeeseee…….imfom. me…this ergent!!t.Q…
plese send 2000watts rms amplifier circute diagram
my mail id
Hi Vash you please refer to my sept 17th comment that site gives you the updated modifications and layout, use them for your success.
can anyone send me a layout on this circuit because i have still dificulties on it i already troubleshoot it but it’s still not working
hi
plz never minde i have not understand in english.
plz give me a woofer circuit 200w
easy circuit
and power full bass controler
and max speaker 8″ +5″*2
Thanx all
Hi Navales you can use the following site’s data
http://pcb.jspayne.com/150wattamp.html
can you please send me a complete pcb layout of this project tip 147. thank you. ( navalesaryan@yahoo.com
Hi NKWENTI there is no protection circuit available for this simple amplifier. you have to take care of speaker impedance(not less than 8 ohms), peak DC supply voltage(+40 and -40 volts should not be exceeded at any time) and loose contacts in speaker connection. you cannot bridge, any mistake will destroy all the transistors may be rectifier and power pack also may blow off.
Hello.
I found this site interesting about this amplifier. My problems with the schematic is this, After i assembled the power amplifier in stereo mode, only one channel was working, the other channel only humm and only the TIP 147 gets hot, but as for the other channel, it gives me good sound, also why is it that the amplifier gets damaged very fast??
Then please i am really interested to build this amplifier in bridge mode, can i just build the amplifier and bridge it just like how TDA 7294 is bridged?? can i please have a simple circuit for speaker protection that can be used with this amplifier??
Any support will be appreciated.
Thanks all
Hi Admin thanks for response the thing is on the output even if I connect them together the positive and negative polarity no distortion sound comes. It should make a disortion sound if amp is alive I think.
I like the circuit and i like to build it in stereo.what changes should be done in the power supply(ie;Ampere of the transformer).
hi….since i completed my amplifier,every time i connect 2 60watts speakers i always experience a hum sound whenever i turn the pot to the end but when i only connect one 60w speaker,it does not occur.what should be the problem and what should i do because i really need to connect the two speakers???please help…
HI ALL
IVE CLEARED ALL MY PROBLEMS WITH THIS ONE CANT USE A 10K POT ONLY 1K INLINE TO AMP AND IT WORKS GREAT I DIDNT BELIEVE THE SCHEMATIC AT FIRST THATS Y I DID IT TO CHECK FOR MYSELF IM SURPRIZED ITS ACTUALLY A POWER LITTLE AMP FOR THE MONEY IF SOMEONE WANTS A PCB EMAIL ME(ejhgbb@gmail.com).instead of bc558-bc556 transformer 36v-0-36v regulated 50v,otherwise all the rest by the book.txs for a great sight and txs mr SEETHARAMAN for the power supply circuit u send me.
cheers john
I did this amp but instead of bc558 I used bc556 and I connected a 10k pot but its not working correctly lot of hum I’ve done a few amps with success but this one has me puzzled,are the bc556 the cause used a 36- 0 36 volt trx,iu know its low but even if it pushes out 50w I’m happy.what could the problem be any help pls. When I measure output volt on speaker line I get 42ma but as I turn the pot it goes to 200ma plus then down again.at full volume not bad but down bad. Help pls
Hi seetharaman
i just got the Tip 142 and i am don with this circuit.it is working perfect for me,i love it.
SEETHARAMAN i must say i am greatful for your asistance.
Pls can i get the circuit diagram for 12volt car amp with a output of 140watt,pls i need this one so bad.
I will be waiting tanks
Its a very simple but effective amplifier,completed mine about a week ago and it works great.But the speakers i have are only 60w so instead of putting 220ohms i put 2k to retard output and improve the stability.
hi seetharaman.
Pls want the resistor that can step down 25v,15v and 12v to 3v and 5v pls.
I will be waiting tanks.
ok,seetharaman
Reply to ANDY
2200 uF/ 16V capacitors are not at all sufficient
Use the one i shown in the power supply circuit
Hi Cooldon kindly list what is available in your market (even it is not Darling-ton transistor) then i can suggest.
Hi Vysakh is correct use with 50 volt DC rating.
check your rectifier output. If need please add 4700mfd capacitor for filtering
I am hearing alot distortion. Is this maybe because of the capacitors that I used to the rectifier. The caps are 16v 2200uf.
Any help please?
Thanks
it’s a simple but huge power amplifier, nice…..
Hi seetharaman,
I am jst coming back from the market,i still can get 2SD2390 (2SB1560,Pls help me i need to biuld this circuit.
I will be waiting,
tanks.
seetharaman, i’ saw the reply tanks every much
WINSTON,i most say tanks man.i am so much greatful
i most say tanks man.i am so much greatful
Hi Winston you can use 0.5 ohms 10watts. Maximum voltage is plus minus 45 volts DC. 32-0-32 volts @3amps maximum for unregulated supply.
hi…i was wondering instead of using a pair of 0.33ohms,can i put a pair of 0.5ohms for replacements.And what is the maximum voltage for amplifier?please reply i need to conclude.
Hi Cooldon you can use 2SD2390 (2SB1560 is the PNP pair of this) as replacement. in place of 1.5k one 1k and 470 ohms in series or you can use 3.3k in parallel with 2.7K if available.
pls i will be waiting
Hi somebody,
Hi everyone,
am cris from JOS IN NIGERIA.pls i need somebodys asistants pls.i want biuld this circuit.but when i went to the market to buy the parts they dont have R1 1.5 and Q1 Tip 142 pls i want the replacement for this componet.pls send it to my email,youngcooldon@yahoo.com
I WANT DOWNLOAD ALL FILES BUT FAILED..
CAN YOU HELP ME..
I WANT A LIST OF COMPONENTS INCLUDING THE TYPES OF WIRES FOR CERTAINTY..
Hi Andy measure always at the collector of output transistor, connected to positive rail.
Hi Jakuv
use the following site PCB drawing includes rectifier and filter capacitors
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=6&durum=e#sonyorum
HI..
I WANT A LAYOUT PCB FOR THIS CICRCUIT INCLUDING A POWER SUPPLY..
EMAIL AT tinytech99@yahoo.com
PLEASE HELP ME FOR MY FINAL PROJECT..
Seetaraman thanks for explaining technically but I’m not that technical
What should I do with my MM to test it? Should I put current measuring on Tip142 base to collector?
Thanks
Hi Masood try this circuit a proven one.
http://sound.westhost.com/project101.htm
dear sir,
this circuit works very well and i salute this circuit .i want a circuit 300w using 2sk1058 and 2sj162.please send me on my facebook alvi.masood251@gmail.com.thanking you.
Hi Andy for a class B amplifier with signal only they should conduct otherwise it should not draw any current theoretically. One output transistor will conduct for 180deg of the input signal and the other balance 180deg. But due to mismatch between the transistors it is not practicable. This will give raise the transfer of conduction from one transistor to other one, may for a small angle both may not conduct. This will start giving crossover distortion.(high volume level will sound ok but very low volume signal will be highly distorted. To avoid this a small forward bias is given to the output transistors (without signal say 50 to 100ma, such that they conduct little over 180deg so there is a overlap between their conduction). This current is called standing current. This is normally measured in the collector circuit of the output transistor without any input signal.
required from any one good amplifier circuit + its PCb
Seetharam what did you mean collector current without any input signal. Can you please clarify?
I am hearing alot of distortion from my circuit
Tanx a lot. . .
Hi Verma guaranteed RMS output is >100 watts with 8 ohms speaker and >150watts with 4 ohms load. it is recommended to use 8 ohms speaker as there is no protection circuits used, only simple fuse protection against short circuit of the output is provided.
Wat must be d impedance . . .8 or 4 in ckt it is givn 8 n in description 4. . . . .
Tanx ,n wher can i learn d basics of audio amp
Hi Varma 10″ or 12″ with free cone movement, not a rigid one.
Hi Andy TIP142 collector current without any input signal.
N can u plz giv me a link wher i can learn basics abt audio amplifiers . . .
Tanx again for ur response ,which kind n size of driver is better for subwoofer using d above 150w ckt. . .
Hi Seetharaman thanks again. Sorry regarding my little tech knowledge but I need spoon feeding
. When you said check standing current through output transistors, it should be around 50 to 100mA. Which are the output transistors those TIP ones? and I check collector to emitter? Which one you’re refering the output transistor?
Thanks
Hi Varma you can use the following project best one earlier appeared in Circuitstoday, with full cetails.
http://electroschematics.blogspot.com/2011/04/filter-preamp-subwoofer.html
for TDA1562Q
http://amplifiers-wave.blogspot.com/2010/12/50w-tda1562.html
And, Can u plz send me a subwoofer ckt using tda1562q . . . .plz do reply
Well tanx a lot seetharaman for ur response ,can u plz giv me d links of subwoofer filter appropriate for dis ckt . . .
Well tanx a lot for ur response ,can u plz giv me d links of subwoofer filter appropriate for dis ckt . . .
Hi Andy you may feed a quality music from your ipod, through a volume control of 22K or 47K to the amplifier and listen. If the quality is good then amp is ok. if not check standing current through output transistors, it should be around 50 to 100mA. if not check the output transistor wiring. check the circuit thoroughly for errors correct them. it is a proven circuit with the transistors recommended.
thank u SEETHARAMAN for ur imediate response. it has worked for me. am fine now
Hi Seetharaman thanks for response. Is there a way that I can check it without preamp? cause a hi gain of distortion is coming from the speaker. I tried a one transistor pre amp but still nothing came out with mic maybe need a more powerful pre amp?
Thanks
Hi Mos connect 10 ohms 25 watts as dummy load in place of speaker and check the voltage across this resistance, it should be just a few milli-volt. if it is high check for mistakes in the component / wiring.
Hi Andy the input requirement for the rated output is 200mV RMS Mic signal will be around 1 to 3 mV. Hence you require a pre-amplifier gain of around 70 to 200.
I read on this forum that one needs a pre-amp to this amplifier for mic maybe this is my problem I will build a small pre amp and see.
hi admin.mos from nairobi and am pleased with ur circuit. its awesome, except for one problem i experience at startup of the amplifier where i hear a thud noise from the speaker . what should i do coz the voltage there is 35v dc. plz assist before my speakers blow off. thank u in advance
Hi Varma use this amplifier after the sub-woofer filter. From your DVD player feed the sub woofer output directly to this amplifier using a potentiometer to balance the Low Bass level.
can anyone plz tell me how 2 use dis ckt for a subwoofer
Today I’ve changed the transistors. Only loud distortion is coming out nothing from mic
I think I am using wrong transistors. The guy of the electronic store told me that BD243c;BD241 and BD244c are good instead those Tip transistors but when I saw their datasheet they are not darlington
. So I have to go and get the right equivalents if I don’t find them.
Thanks
Hi Ellis They are low power audio ICs for computer speaker amplifier or headphone stereo amplifier.
you can use the following application circuits.
http://pdf1.alldatasheet.com/datasheet-pdf/view/25055/STMICROELECTRONICS/TDA2822.html
http://www.datasheet4u.net/datasheet/L/M/4/LM4863M_NationalSemiconductor.pdf.html
http://www.datasheet4u.net/datasheet/L/M/4/LM4863M_NationalSemiconductor.pdf.html
I was very enthusiaistic about the amp, after reading comments. i took time and did things diligently, i did everything from scratch including making my own PCB
getting transformer made from custom shop,I built the amp, but I was totally dissapointed with the experiments result,
I used 50-0-50v 5amp
when i measure the voltage was around 58-60v
Audio input is around 12-20mv
i used 1.5E 6w instead of .33E 7w which turned to red hot the moment i turned the power on
later i changed the resistor to .5E 10w same thing it turned red hot with internal wires visible.
i had to switch it off before it is burnt.
Can any one help me troubleshoot the amp.
Here i have an HWCAT IC CSC2003P,Is there any simple circuit you can suggest for me?
Seetheran,i have here an IC2822,Which circuit can i design using it?give full details pliz.again on dealing with a 150w amplifier i can’t find the nf capacitors.and my havit HV-A35 amplifier ic is burnt so i cant find LM4863D IC which one can i replace with?please help.
I was actually looking for a 600watts amplifier design from the foundation to the finishing of the project.
Yes for sure I did that but I did this circuit on a bread board to test and I’m thinking that certain components not contacting well.
Hi Andy you require both plus and minus supply. with + & – 12 volt you will get distorted low sound.
Hi Seetharaman thanks for response. I cannot make this circuit work with 12v supply don’t know why
. I am using 243C 241 and 244c instead of the Tip142/41/147 transistors.
I connected a mic to try to hear something but nothing till now.
Still testing.
Hi Hengilbert Thanks for your observations. your ideas are correct but these components need not be mounted on the heat sink, the circuit will get over compensated, hence it can be just nearby. The presets are always a problem for the constructors, with least tools hence it is always preferred to eliminate these complexities to enable them to have successful results without any disappointment, in the first attempt itself.
Hi Seetharaman,
you can mount the tip41c to the heatsink alongside with tip142 and 147.Adjust it first to minimum and slowly adjust.
or with the original circuit,you must put the diodes near the heatsink to sense the heat.
I have again the two IC’s (CSC2822 and CSC2003P)so i’m wondering which circuit can i construct with those two?
Hi!i have a havit HV-A35 Speake with built in amplifire with an ic LM4863D which is damaged and so i can’t find it in stores,which one else can i use to replace the LM4863D?PLEASE GIVE ALL SUITABLE IC’s.
Which transistors can i use except the stated ones?i’m in Lesotho.
Hi Hingilbert it is ok but the preset adjustment will be critical and over a period of time they give problem and out put current will raise damaging out put transistors, the modification of the above site also will give thermal compensation as above but for the indicated preset problems.
any modifications on these circuit??
i have an idea.
http://imageshack.us/photo/my-images/38/150wattamplifercircuit.png/
Hi Mordis all capacitors are rated for 50volts. if you can give us what is available in your place we can suggest you which one you can use as equivallent
Hi! I want to deal with a 150 watt amplifier but the problem is that the voltages of the capacitors are not stated and i cn’t fint some of the transistors in my place,coul anyone please help with the voltages?i’l b more than happy if i can get them.
Hi Andy this amp will give some highly distorted sound. with plus and minus 12 volt from the 12 volt transformer. nothing will blow.
Hi I am trying to work this ciruit with a 12v transformer to a 2w speaker. Do I blow them both?
Thanks
ok….thanks for helping…
Hi Mike of course you can substitute a 10+10 stereo amplifier. you can place it in between the pre-amp out and 10 watt stereo amplifier.
….so purely op-amp and no other elements needed??
hi there, is it ok instead of two amplifiers(10w rms) i will substitute a stereo aplifier at the same wattage??
…and where do i place this circuit?..is it ok to place it after my preamp? (my preamp is also an op-amp)….
Hi Mike you can use two operational amplifiers in one, connect Left channel signal to non inverting input and Right channel signal to inverting input the out signal will be left – right signal feed it to an amplifier of around 10 watt RMS and place speaker at the rear left. Carry out vice-versa you will get R-L signal; feed it to another 10watt amplifier and place the speaker at rear right. with mono signal your sound image will appear at the front center other speakers will be dead. with stereo signal you will get the surround effect.
Hi there, do you have some additional circuit use to generate multichannel and incorporate it with existing two channel(Right and Left)???
other suggestions?………
Hi Dieudonne you have to use PNP and NPN power transistors with zener diodes etc please refer to active series pass regulators.
And can i use 2x100ohms 1watt on either power (+/-) as a pass regulator?
which type should i use thanks.
Hi Dieudonne it is not possible in this application as the load current is not constant and varying one as per the volume level kept at the amplifier (power delivered), hence you have to use series pass regulators for both positive and negative supply.
Hi i want to regulate the power of my transformer from 45v to 35v by using a POT. Which resistant should i use.
Hi Mark012 connect a 4.7k in series with the slider of the control to input of the amplifier. add 470 PF in parallel to R7. Now connect 0 volt reference bus to chassis at the input socket. (earthing to chassis from 0 volt bus should be done at one place only multiple grounding will give raise to severe hum).
Hi, I want to ask the same, about connection PCB ground and chassis earth. Do I have to wire direct link or put some resistor or diode?
Hi there. At the end of my preamp there’s a 47k pot. Should I put some component between pot an input of amplifier or not? Does it change input gain of power amp? And what about conection of a PCB ground and chassis?
Hi Mic inter change the speaker terminal and try the feed back phase will change still no effect reduce main amplifier coupling capacitor to lower value may be 2200pf or so. most scientific method will be introduce a graphic equalizer bet ween pre amp and main amp and reduce level of each pot at a time and one pot or two should solve your problem.
hi there, my next problem is the noise feedback created when i put my microphone near to the loudspeaker….
do you have some circuit design or suggestions to eliminate this feedback?…
hi,….ok so no need to replace my output transformer…thanks for helping,,,….
ok, I will try it…
Hi Mic your filter capacitor should be at-least 10000uF. your amplifier ground and booster amplifier ground should be connected at only one place. ensure no hum is introduced from the main amplifier. you may have to give a overall feed back to first amplifier from booster amplifier out put to linearize the amplifier. with this your amp should work fine.
Hi there, I’ve change the biasing resistors and have a current of 29mA and the music is good but i am not satisfied because there is a humming noise……is it because of the power supply? or still there is another problem?,…my power supply by the way is not regulated only filters….
or should i increase the power of my output transformer to greater value because i have only 50watts?….pls…help me…
hi, can you email it to me your schematic diagram of transformer coupled booster?
actually I made an experiment, from 470 ohms i reduce it to 300 ohms, and i find out that the music is ok, but i notice when i decrease the volume i heard humming noise…
i will wait your design, thanks….
Hi Mike without input to your coupling transformer check the current drawn by the out put stage (2 X MJ2955)if it is around 25 to 50mA, it is ok if less increase 12 ohms to 15 etc. If high reduce to 10 etc. Once you are satisfied now feed the input to coupling transformer through a 1K pot. Now check whether the distortion is reducing. now vary the drive to coupling transformer and listen.
My power supply is 12V,6A. I’m using transistors value of MJ2955…..
so, what should I do with my coupling transformer?….
Hi Mike Your 25 watt amplifier will saturate the driver transformer cores. this will lead to severe distortion. your bias resistances are OK but you have not mentioned the supply voltage to your push-pull add on circuit and about the PNP transistors whether they are germanium or silicon to give further comments.
hi there, i build a transformer coupled push-pull amplifier using PNP transistors. My plan is to boost my 25W amplifier. But then, i come up with distortion, both input and output transformer are center tap and biasing resistors R1=12ohm, R2= 470ohm….can you help me solve my problem……
and pls. email it at micburn18@yahoo.com.. thanks…
Hi Dieudonne you can use up to a maximum of 35-0-35 volts transformer for this circuit.
can i use 45volts transformer
Hi Mr.Seetharaman, I have compiled amplifier by all the instructions (change R8 and R9 to 10watt, put a 470p cap on colector-base on both darlingtons, have a zobel network – 0.1uF with 10R 1watt, change C1 to 100uF, crossover distortion diodes are 1x 1N4007 in series with 2x 1N4003 and 12ohm resistor, have a 40-0-40 DC 270mV transformer, use 2x 8 ohm celestions speakers) but when turn ON the amp, there is a huge low noise and sound isn’t clean, there’s a still some distortion. What now? I got a good RMS power but and lot of noise too….??? Do you suggesting to continue with this amp and find a solution or made another for myself??? Im a musician and want something fine “selfmade amp” for myself.
Hi Dieudonne you can use 50K pot.
can i use 50k pot/100k pot instead of 10k pot.Because i only got 50k and 100k pots.
hi i build this circuit when i power on my speaker blow (4 ohms 80 watts) i used 45 0 45 power supply .any one solve this problem
Hi Mark012 it looks like your speaker impedance is low hence with high volumes the peak out put current exceeds the safe limit of out put transistors. You can increase emitter resistance to 0.47 ohms 10 watts. You kindly refer to my motional feed back amplifier the protective diodes in parallel to output transistors and the Zobel network also can be included as additional protection.
http://www.circuitstoday.com/motional-feed-back-amplifier
I need answer! If anyone knows a solution???
Mr. Seetharaman, problem solved about output, it was my mistake about R7. But…I have another problem now. Everything works great until push up volume to about 8/10. Darlington transistor blows up at that volume! What now? I have a large heatsink from older amplifier and think that’s not a problem.
Should I change R8 and R9 to 7-10 watts or what?
Thanks for responding….
0.33 ohms 10W could be used.
hai
this circuit is perfect, but if the load is 8ohm 8″speaker with tweeter and use la 3161 head pre + baxandall tone circuit system need for hearing quality
regarads
iqu
I used 5w0.33 and when i aplified it, the transistors went off. Because i couldn’t the 7watts. And i ask can i use 10watts.
Hi Mark012 these are perfectly OK. Try by i ncreasing C1 from 10uF to 47uF. already the amplifier gain is around 100, hence i feel your input level is insufficient drive the amplifier.
Hi again Seetharaman, I still have a problem with not enough output power!?! On my PCB I use 2x bc556 instead of bc558/ R8 and R9 are 2x 0.33 5W resistors/ diodes are 1x 1N4007 + 2x 4003 in series with 12ohm resistor. Everything else is like this original circuit.
Is this componets are problem or something else???
Thanks for helping and responding…
thank you a lot for the circuit. i have finally made it but with omission of R1 and R7. for me its working better than having the two resistors in place. from Nairobi Kenya
i tried it but wont work at all. do not know what to do
Hi Mark012 with 42-0-42 DC supply you should get more than 160 watts. May be your input drive is not sufficient. You require 300mV RMS input signal for the rated out put. Just try connecting 100uF 25 volt in parallel with 33 ohms (R10) the sound should become bold. You can try with 45 0 45 volt 6Amps power supply. As with lower impedance speakers you require a higher peak current capability from the power supply.
Mr.SEETHARAMAN, I try this circuit amp with good hi-gain guitar preamp and I got a about 60-70W RMS at 4ohm (2 speakers parallel at 8 ohm 100W each)!?! I compare my amp with a guitar amp “Marshall AVT 50 (50W power)” at the maximum power and looks like almost the same output power. So what’s a point to get a 100-150W RMS with this amp schematic.
TIP 142 and 147 works at 100V and can handle 125W maximum. I use 42-0 -42 volts at 4A.
Sory if I’m boring you but I need at least a 100W RMS power for live gigs playing…
Is this circuit realy give a 150W RMS power or I did something wrong???
Thanks for understanding….
Hi Richard Tip142/147 are Darlington pair with a current gain of around 1000 but C5198 is just a transistor with a gain of just around 60,hence cannot be used.
can i use c5198/a1941 instead of tip142/147?
@kambo
I’ve used 1/2W resistors. Not much current gets through them so i believe 1/4W could be used too
Very good project and extremely efficient for driving subwoofers. Just add a potensiometer between input and source and let there be music!
Just install efficient heat spreaders on tip/bdw, they get HOT!
Thanks!
What is power (watts) of the rest of resistors used on this 150w amp.
plz help equivarent of ceramic capacitor 103 and 2k470j how do i convert them to uf.
Hi circuitstoday, i would like to ask favor from you can you send me please PCB layout of 100watts subwoofer, 150watts & low pass filter. just send it to my email ad. thank you very much for youre help.
Hi, this amplifier looks promising… I want to use it on a 4Ohm subwoofer, a 25-0-25 ac transformer 6Amp should be appropriate, right?
Seetharaman could i have a project description sent in my email? Thanks in advance xhorium@hotmail.com
I have a new PCB layout done and circuit boards are available. The new layout includes provisions for bypass capacitors that add stability. Also, the layout accommodates both the low and high wattage TIP transistors packages (TO-220, TO-218/247).
http://pcb.jspayne.com/150wattamp.html
hey……
i’m myanmar.
220volt amplifier circuit diargram see.
Hi Marko12 you can use this amp with suitable guitar preamp. you can fix this also in side a good solid speaker enclosure
I want to try to build this amp but can I use it as a guitar amp? How good is this amp for a guitar and a guitar cabinets
great circuit,.. it works very fine,..
24-0-24v, 5A. Power supply for 150w amp will it be okey?
Hi Sebin you can do that. it will be a nice sub woofer amplifier. Kindly add a 330PF ceramic disc capacitor between Q3 collector and base.
is it possible o connect a bass filter before the input and use it as a sub woofer amplifier
no comments it work fine….i built this one,very good circute
gud day, seetharaman,. nice IC. can i use 12 amperes as a power supply to tda2030? LM4702 is not available here in our place..
Hi Rogelio LM4702 (a power amplifier driver IC)will give an output of more than 60volt drive for the output transistors which as per their application data 300 watts RMS power with least distortion. you can use +100 & -100 volt supply to get 7 volt RMS with quite low distortion of less than 0.001% . Anice IC to try if available freely i the market.
you may go through national datasheet
http://www.national.com/ds/LM/LM4702.pdf
hi, seetharaman. tnx 4 the reply last feb 23,. uh, can i ask u what is the output power of LM4702b?
,seetharaman..tnx 4 d rply.. I thought u will send me the project capability and limitati0ns to my email..? U said dat in ur c0mment ryt? C0z u said, the space here is n0t sufficient.. I didn’t receive an email fr0m u..
Hi Tel refer my earlier comment
Hi Laeka to enjoy high fidelity music you require a good soft thumping low frequency reproduction. this can be achieved through a good quality medium to high power amplifier. it is not that you will be blasting always at 150watts but with modern digital equipments capable of producing 90dB dynamic range you can enjoy the music without any distortion creeping in. This circuit is a simple straight forward good design, that is an added advantage.
,ok. I will f0llow you.. Can u give me the significance of this project? teljarabe@yahoo.com this is my email..
Hi Tel the project limitation is 150 watts into 8 ohms speaker. this limitation is due to the thermal resistance of the output Darlington pair transistors. send me your email id i will give you full description. here the space may not be sufficient.
,and also can u give me the project description of this circuit? Tenk u..
,seetharaman..tnx 4 d rply, i hav an0der questi0n. What is the pr0ject capability of this circuit and its limitati0ns? Pls rply..tenk u s0 much.
Hi Tel +44 – 0 -44 volt 2Amp supply will be just right. If you are assembling stereo amp with this use RCA-Phono sockets for the input. (most rugged and fail safe)
Hi Laeka to enjoy high fidelity music you require a good soft thumping low frequency reproduction. this can be achieved through a good quality medium to high power amplifier. it is not that you will be blasting always at 150watts but with modern digital equipments capable of producing 90dB dynamic range you can enjoy the music without any distortion creeping in.
what is the general objective of this project pls reply thanks
seetharaman can you please give me the complete computation of this circuit? i need it so badly, our submission of this project is fast approaching…plssss.. and what kind of babay jack am i going to use? mono or stereo?
seetharaman i need ur reply,, is my power supply right? it has 44 for positive and 44 for negative?
Hi Rogelio wattage is V (AC voltage available across speaker terminals with load)square divided by impedance of the speaker. hence you will get half the out put for 8 ohms instead of 4 ohms. that is 50watts.
gud day,! thanks a lot seetharaman,. uh, wat will be the power output on 8 ohms?
Hi Rogelio +/- 30 volt can be used. the power output to 4 ohms speaker will be around 100Watts. you require only a 2amp supply for stereo 4amps that is all the requiremen, which TIP142/147 pair can handle.
hi seetharaman, can i use a +/-30 15amp to the tip147 & tip142.?
This amplifier is amazing, i have build the amplifier several times, but the Amplifier is too complicated, at times when i assemble it in Mono, it works well, but when i do it in Stereo, i have problems, then the transistors are very sensitive and quick to be blown, that is my problems, but i usually run the amplifier with a +/- 35v instead of +/-45, why do i keep having this problems?? please any help forwarded to me at dnkwenti@gmail.com will be appreciated, my greetings to you all.
……………….PEACE AND GOOD LUCK………………..
Hi Crystel you can use 2nos capacitors in series with parallel distributing resistances, can be 2.2K 0.5watts.
,can someone tell me wat capacitor can i replace in the p0wer supply of this amplifier. The 63v is n0t available here in manila.. Only 50v I need a reply.. Plss…
does know the alternate transistor for bd708
hi sir seetharaman im done with the circuit tnx…
i have a question i have amplifier konzert av 301 with
22 0 22 volts and A1941/C5198 transistor.. if i make the transformer 35 0 35 does make the amplifier add its watts? this will not damage the amplifier? tnx
tnx seetharaman.. am drilling the pcb.. i hope it works… tnx
Hi Richard you can use TIP41C in the place of TIP41.
TIP41 Vceo 40 Volt
TIP41A 60 Volt
TIP41B 80 Volt
TIP41C 100 Volt
But for the above parameter there is no other difference between them.
sorry its not bc558 its tip41c.. can i use that? tnx
Hi admin there is no bc558 available.. bc558c is only available here can i use that transistor? tnx
HI seetharaman
i am very happy to meet you in this site after long time
what about 500w pa amp still construction is going on?
i am very eager to do that amp
thank you
please give a practical transistor combination for the npn and pnp darlington transistors.eg,tip147 is (tip41+d718+in4007).
Hi Fozu R3 and R5 should be 3.3k.ohms(3k3 / 1 watt). for mic you have to have an additional amplification of 50 to 100 before feeding to the amplifier.
you can use the circuit appeared earlier in circuits today
http://www.circuitstoday.com/3-input-microphone-preamplifier
As for a mic input, you would need a pre-amp to get enough gain.
As stated in this article, you need a good quality power supply. In my experience you need power supply decoupling caps very close to the amp circuit. In addition a cap(10-100pf) from C to B on the TIP41 helps a lot. Also, you can add a 100pf(approx) from input to common. It is fairly easy to scab in these caps on the bottom of your board.
As posted earlier in this thread, addition of an RC network on the output adds stability.
I am working on a layout that incorporates these suggestions. I will post when it is ready.
hi all i hv tyied above circuit with 1)R8 & R9=10watt.33ohm 2)R3 &R5=33k(33000ohm) 3) power supply =35-0-35 4)audio in =mic 5) pcb lay out stephen’s
my prob is when i give it voltage input tip142 & 147 get warmer plzzzzz anybody who has tried it tel me what is the basic or main problem in it
response me soon plzzzzzzzz
using mic this circuit is not working:( pcb lay out used is Stephen’s design…..
plzzzzzz teme about audio i/p?
hi Seetharaman i have try this circuit as my project with 35-0-35 i/p supply, 8ohm 100watt, but i need to knw about i/p if i use a mic will it work? or what can i do to input audio?
i need some specs for the 150 watt.
hello, for those people making this amp there first project make sure not to use imitation output transistors, especially residing in Philippines!marami kasing fake!
wat will happen if the output terminal and the input terminal for power supply is near from each other???
hum noise???
Hi seetharaman did you remember me what about 500w pa amp
@ shailendra007
check your pcb design.
i am happy to know that this circuit is funtioning well. but i want to ask if we can use a supply of 30 0 -30v. i also wish to request for the 1500w inverter circuit. i am waiting pleaseeeeeeeeeeeeeeeeeee.
hi, i was made this project on general p.c.b but it was not working , what was reason i dont know ,please help me
Hi Caloy 3 diodes are just sufficient to operate on Class B mode.
Hi Basha you can turn a thyristor on with the positive gate pulse but cannot control with gate pulse there after. You have to reduce the current flow through thyrister below its holding current to switch off.
Is there any thyristor which turns on negative gate voltage and turns off on positive gate voltage.
I got good results with 3.3K resistors in place of the 33K resistors.
how many bias diodes do you require which will work the best???
Hi Edcube the quality can be improved by adding one more diode and a 10 to 22ohms resistance in series with the existing 2 bias diodes D1 and D2. Ensure the no signal currnet through the output transistors are within 50mA.
HAPPY NEW YEAR TO ALL…!!!!
I built this amp. It works but the crossover distortion is quite bad especially at low power levels. It can be seen very clearly on an oscilloscope. It seems the comment previously posted by somebody is true. (That comment is gone though – removed?.) This amp is OK as long as you are not looking for high quality sound.
thanks for that info mr.seetharaman…32-0-32 is not available here…
Hi Caloy you can use 24-0-24 which will produce dc 34-0-34. with 3amps current capability will ensure 125watts into 4 ohms speaker. with 8 ohms speaker 62watts will be delivered.
is it ok if i use 24-0-24 transformer for this project????
Hi DAN46 TIP147 is a PNP Darlington pair. you can try using BD140 with TIP2955 in Darlington with 1N5404 / BA148 diode as indicated in the above pin out details.
Plsssss!!! I ned d cal for dis amp.as much i can get.i ned it 4my writup.cal 4rm d power suply,stages cal and power consmp&los.u can email me.thaankss in advanc
my email is boyolu4real@yahoo.com.i’m watin badly
HI pls how can i get the tip147 transistor?? or can i use tip3055 for tip147?
Hi Caloy 0.47 ohms 10watts will do.
is it ok if i use .47 ohm 15watt resistors for R8 & R9???
D circuit’s wokin gud .gud job
Thanks Stephen
For all who want, I have created a PCB layout of this 150 watt amplifier. There is a correct size PDF of the PCB layout. Goto http://pcb.jspayne.com/150wattamp.html for more info.
ok
The one off test model is under rigorous tests.
Hi seetharaman what about 500watt amplifier
Hi Segzy kindly use the following circuit which appeared earlier in Circuits today.
http://www.circuitstoday.com/40v-dual-power-supply
use 32 – 0 – 32 transformer in place of 30-0-30
Pls i ned diag4 d +/-45v dualpower suply witout IC
Pls can i build +/-45vdual power suply witout using IC?i ned hlp on d circt diag
Hi Sabri use the 100 watts inverter appeared earlier in circuits today with 555 as per diagram shown below
http://skema-elektronik.blogspot.com/2008/12/inverter-12v-dc-to-120-230v-dc-with-ic.html
mr.seetharaman
I NEED CIRCUIT CAN BE CONVERT 12V DC TO 220V AC @60HZ ??
CAN BE USED 555 IN THIS CIRCUIT?????
THANKS
I HAVE REPLACED BOTH 142&147 AND ASLO ADDED A GOOG HEAT SINK ALONG WITH HF STABILITY COMPONENTS. THANKS AGAIN FOR YOUR VALUABLE ADVICE.MY AMP IS FUNCTIONAL NOW. CAN YOU SEND ME THE 5.1 SYSTEM DIAGRAM. i HAVE 4 AMPS WITH 01 SUB OF 100W.
Hi Segzy you have to use both positive and negative supply. with one supply only it will not work.
Is it comp 2use dual pwer suply 4d amp?can i use+45v btwn d +ve tminal&GND 4d amp?can i also 12-0-12 voltage doubler 2obtain 48v 4d amp
thank you very much. I found the collector emitter short and hope it was due to the heat sink (as I forgot to fix them on first power on). I will do the rest of the modification and let u know the results.
Hi Saju checkup for transistor collector emitter short (though base emitter and base collector is ok). check the polarity of bias diodes. R5 = R3 = 3.3K (3K3). have you fixed HF stability components. 1k with 470PF at the input. 100PF between collector and base of Q3. fix 0.1 uF ceramic disc in positive and negative power supply rails. with this it should work. all the best
hi caloy
The PCB been adopted from the diagram on the web.
hey SAJU
maybe follow what is exactly shown here:
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=6&durum=e#sonyorum
I am using +/- 35V with 5Amp fuse. And also have the PCB which is available on net. I have gone through your earlier comments and doubts whether the fuse is blowing because of the HF instability?. The very first time when I swiched the Amp on it amplified the signal. There after no respose to the input also!!!!!!?
All the componets are in good condition
kindly advice me what to do.
how about 3amps on 300mA device??
hi, Seetharaman
I have tried the circuit but the fuses on both + and – power supply keeps blowing. I have done the visual inspection could not find any wrong connection. please advice me
Hi Adnan you can use 0.47ohms 5watts resistance for each transistor, so that each transistor is taken care from over current(equal distribution of current will take place) all will share the current equally.
Hi Saju a simple fast acting fuse can protect the speaker from burnout.
Hi Caloy only 900mA will be consumed the balance is the additonal capability of the power supply, that will be in reserve. nothing will happen to the components. if you have a 40 watt bulb connect to your domestic mains which is capable of 5KW before blowing the fuse, the 40 watt bulb will consum only 40 watts not more than that.
is there a possibility that the device will be destroyed???
what will happen if i use a 2 amp power supply on a device that requires only a 900mA of current???
can you provide speaker protection circuits for the amp
HOW CAN I CALCULATE THE EMITTER RESISTANCE FOR PROPER PARALLELING?
Hi Adnan proper way of paralleling with emitter split resistance it can double the power with lower impedance speaker. with 45-0-45 and 4 ohms speaker you can achieve 300 watts,
if we use 2xTIP147,2xTIP142,TIP41 in parallel @ 45-0-45v 4A
will the output of amplifier increase from 150watts?
Hi Saju you can use down to + – 25 volts. Note the resistances R3 and R5 are 3.3K ohms.
Hi Jack The amplifier gain is set at 100. (R4 / R2)
With 45 volt supply and with 8 ohms speaker to achieve 42 volt pk to pk ( 42 / rt2 = 30 volt RMS i.e 30 X 30 / 8 = 112.5 watts RMS) you require 42V pk pk / 100 = 0.42V pk to pk.
For clues in construction please go through my comments from the beginning.
hi, Seetharaman
Can we use +/- 35V supply for this circuit.
Hi, Seetharaman, I’m Jack Daniel
this amp is look simple to build, can you please explain what is the full specification such as
min & max of DC Voltage for this circuit.
Secondly what is the input signal voltage peak to peak, so we don’t overload the poweramp circuit which can create unwanted distorted sound.
Hi Adnan it should be 10-0-10 volt 25 Amp capacity (6-0-6 shown is incorrect) transformer will be best suited as you have to take care of saturation voltage of transistors. collector to collector shorted indicates that they are all on the same heat sink without insulation. otherwise the circuit is in order
http://www.eleccircuit.com/500w-inverter-12v-to-220v-by-40472n3055/
plz visit this site and suggest the transformer i cant understand plz help me?
please refer to my earlier comment:
seetharaman says: June 25, 2010 at 9:18 am Hi Bryce You can connect the volume contron in the input terminals of the amplifier. cold end to common, pot variable point to input coupling capacitor and signal between the earthy end and the other end of the potentiometer.
you can use 50 K for 47K. ( JIS is 25K 50K 100K but western preferred value std is 22, 47, 100)
What about a volume control?
Hi Caloy you can use 0.47 ohms. it will affect the performance of very low impedance speaker as the peak current through the output transistor will get limitted. with speakers of 4 ohms and above it will not matter.
is it ok if i use .47ohm 10 watt resistor for R8 & R9 ???
Hi Caloy no possibility at all. The amp will draw the required current only though the power supply is capable of 6amps. Here it is designed for 5mA only, so nothing should happen
is there a possibility that the bc558 transistors will explode if i use 6 amps of current ????
do you have PCB pattern of this amplifier?
Hi Adnan yes you are correct as per calculation. the circuit to which you are going to feed should be capable of handling the voltage, current and power.
if we give 50-0-50v 4 ampere means 400watts of power and suppose our amplifier is of 75% efficient then AC output is 300 watts?is this true or not
Hi Adnan the power supply gives the power to amplifier after consuming some it delivers the balance as power output to speaker(efficiency). amplifier power output cannot be greater than power supply capability.
Hi Mounica in the spec there is a small mistake it should be 4 ohms system 300 watts 8 ohms system 150 watts. if your woofer is 4 ohms, use 4 ohms tweeter in parallel (in phase) with woofer through a non polar capacitor of 5uF if system is 8 ohms use 2.5uF(you can even use ceiling fan capacitor, if non polar is not available). if you feel the volume of tweeter is quite high then add a 22 ohms wirw wound 10 watt pot in series with tweeter and adjust for just matching volume level with woofer, while playing good music.
Hello seetharaman
I want to use the tweeter along with the speaker for specifications see the link http://www.ahujaradios.com/ProductSpecification.asp?prd_id=204&id=7&sc_id=49
how i have to use it. something like resistor ,capacitor
is there any relation between DC supply power in watts and amplified power in watts?
No these analog amplifier’s efficiency cannot be increased. To acheive higher efficiency you should go for class d amplifiers.
can we increase the efficiency of this amplifier?
Hi Caloy 0.4 is not a standard value you can get 0.47uF (470n). 39PF is just 39PF only.
This amplifier though it can be called as class B. it is just class AB push pull amplifier.
what class of amplifier is this???
what is the capacitance code of 0.4uF & 39pf capacitor???
Hi Sagar leave the center tap use the full winding it will be 24volt. use a bridge rectifier and filter capacitot to get 24 volt dc output.
Hi Adnan yes you can give both the channel inputs at a time.
can i give two inputs (both right and left) at a time???
can i give two inputs(both right and left) at a time?
if i have 12v center tap transformer how can i get 24v from it
Hi Caloy with 5 watts the output current can be 4amps continuous with 7 watts it will be 4.6 amps. in fact with audio in it will be only varrying current hence 5 watts is more than sufficient. if you want to drive with sine wave at full power continuous then use 7 or 10 watts. you can use freely available diodes 6A1 four numbers.
Hi Adnan yes you are correct you can use 2nos 10uF in series to achieve 5uF. (resistance in parllel formula will hold good for capacitors in series).
can i use 10uf in series to get 5uf?
if 6 amp bridge rectifier is not available…what model of diode should i use???
mr.seetharaman
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=6&durum=e#sonyorum
R8 & R9 is 0.47 ohm @ 5 watt…what will be the effect???
Hi Nightingale first you can start with a variable power supply using LM317 which will be useful for all your projects. then you can proceed with projects using around 20 components and useful for domestic requirements.
Hi Adnan it will be limitted to your power supply capability. That is 64 X 4 = 256watts of energy is available. say if the amplifier efficiency is 80% then you can get around 200watts. againg this is dendant on the output transistor capability its thermal conductivity etc.
you tell me last time that if i bridge this amplifier it will give me 900w @ 4ohms but it will require 4 times current and you suggested me 32-0-32v @12amp transformer right but if i use 32-0-34 transformer @4A how much output will decrease in bridged mode?
hey m a first year engineering student,i want to know some initial and interesting projects as i havent studied alot yet..reply soon
Hi Caloy you can use 6amps transformer as the requirement is just 5 amps it will be better to use slightly a higher rated transformer.
is it ok if i use 6 amp transformer for the amplifier???
Hi Caloy the circuit diagram is correct. component list shows IC as TL084 it should be TL082. C5 is not shown but 220 ohms is shown in the pcb layout, change it to 0.4uF and out put resistance R10 is shown as 100 ohms, it should be 220 ohms. the first photo of the assembled module is correct. the circuit is working ok.
if i make this amplifier two times and bridge them then what will be the calculated output if using 35-0-35v @4A transformer? plz calculate it and tell me and show the calculation that will be helpful to me??
Hi Seetharaman,
Thanks a heap, spot on, except for 2 nos internal resistors of 10K, which can be managed,
regards & Cheers!!!
Hi Patrick BC107 transistor is the equivallent you can refer the following site
http://engisys.info/transistor.php?transistor=48078
another link for the low pass filter:
http://www.free-electronic-circuits.com/circuits/low-pass-filter-subwoofer.html
mr.seetharaman,kindly look at this low pass filter….
http://english.cxem.net/amplifier/amplifier21.php
some parts of the pcb layout is different from the schematic diagram….
what should i follow???the schematic diagram or the pcb layout…???
thanks mr. seetharaman…
more power….
Hi Admin,
Pls can u let me know what is the equivalent Transistor for UN4211, Iam new in bangalore (india) and iam unable to find the transistor nor any help from the shop vendors regarding equivalents
regards
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=7
300 watts mosfet amplifier
Hi Caloy you can visit the following site which gives you all details for the above amplifier including pcb layout etc
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=6&durum=e#sonyorum
seethasub@hotmail.com
MR.seetharaman,,,when will you send the pcb layout…i’ve already bought the components…
i made a pcb layout using double layer pcb…
will you pls check it….
will you pls give me your e-mail account and i will send you my pcb layout & check if there are errors……..
MR.seetharaman,,,when will you send the pcb layout…i’ve already bought the components…
i made a pcb layout using double layer pcb…
will you pls check it….
will you pls give me your e-mail account and i will send you my pcb layout & check if there are errors…
Hi Adnan for a cross over frequency of approx 3KHz you require 3.3uF for 8 ohms load and for 6ohms it will be around 5uF. 100 volt is chosen to take care of the output voltage swing of the amplifier. capacitor should be in series with the tweeter. the whole thing should be in parallel with the woofer.
yes i will send
will you plz mail me the circuit of 500watts amplifier with shreya????
you tell me in 2nd last comment to use 5uf 100v capacitor for 50watts tweeter tell me how will i decide the value of capacitor according to input of amplifier and speakers for connecting in parallel same as u tell me?
is the capacitor connect in series or in parallel?
Hi Adnan feed connect the meter in AC voltage range across speaker, feed some loud music to the amplifier. read the maximum AC voltage reached by the meter. this voltage square devided by 6 will give you the power outpur. For getting RMS power you have to feed 1KHz sine wave input and go on increasing it till the sound is clear without any distortion. measure the AC voltage and calculate as above.
Ive made this amplifier using 35-0-35 transformer 2x3300uf 71v capacitors with 2 0.1uf ceramic with 6ohms 150watts woofer
how can i calculate the output power using multimeter tell me the method plz?
plz send me the pcb diagram of above amplifier and also the power supply circuit?
Hi Adnan you can connect you tweeter in parallel with the woofer through a 5 uF 100 volt non polar capacitor.
Hi Emmi I have replied to your email
i have connected a 150watts woofer for base and i want to connect a tweeter of 50w 4ohms in parallel tell me how can i connect tweeter?
hi seetharaman your given circuit is producing more distortion there is no clarity
i gave 12v to it
ive made this apmlifier using 35-0-35 transformer 2x3300uf 71v capacitors with 2 0.1uf ceramic with 6ohms 150watts woofer
how can i calculate the output power using multimeter tell me the method plz?
Hi, Seetharaman, if you don’t mind, can you please provide some details about the power supply which will robust enough for stereo channel?
Do we have the full specifications for this circuit.
I am interested to build one for my self.
HI can send me the PCV plan thank you
Hi Emmi you can use this circuit befor your tone control circuit. if no tone control circuit use with your sub woofer or 150 watts amplifier.
Thank you for your quick reply
i have to use your circuit after my Aux circuit or use instead of it
hello today i have sent a mail to you (seethasub at hotmail)
please check it and kindly send me reply please its very urgent
Hi Nidesh it can be TIP41 A or B or C. TIP141 is an NPN darlington not our requirement
Hi Caloy i will mail you soon
Hi Shreya the design is getting frozen still some reliability test have to be completed. pl wait.
Hi Emmi the PCB layout and copper track will be send to you soon
transister Q3 ,IS IT TIP141 OR TIP 41 ,GIVE ME ANSWER IMMEDIATELY,THANKYOU.
hi mr.seetharaman
here is my e-mail add
pjc_valerio@yahoo.com
thanks a lot…more power…
Hi seetharaman
what about my amplifier?
plz send me the pcb diagram of both 100watt and 150watt amps
emmizeb@gmail.com
and i have send you a mail to seethasub@hotmail.com but you didn’t give any reply why?
plz send me the pcb diagram of both 100watt and 150watt amps along with them
emmizeb@gmail.com
and i have send you a mail to seethasub@hotmail.com but you didn’t give any reply why?
plz send me the pcb diagram with caloy
adnan_khan_yzai@hotmail.com
Hi Caloy i will send you the PCB drawing soon
Hi Adnan with respect to chassis or common the voltage is 50 hence should not be a problem.
can you give me some tips for designing the pcb of this amp..
thanks….
can u give me some tips for designing the pcb of this amp…
thanks…
Thanks Seetharaman….
its mean 50-0-50 dc volts @ 4amp are not dangerous?
but if accidentally touch the wire will it leave the human or not?
Hi Caloy you can use this amp as sub woofer amp use external sub woofer filter.
Hi Adnan it depends on the resistivity of the body(wetness etc) even 100 volt DC can kill a human under certain conditions
what is the dangerous range of dc voltages which can kill a human?
Hi Adnan you can use two 8 ohms 150 watts speakers in parallel, which become 4 ohms and with 300watts power handling capacity.
HELLO…CAN I USE THIS AMP AS A SUBWOOFER PWER AMP…???
if a amplifier gives 300 watts at 4 ohm
can we connect two 150 watts speakers in parallel?
YES ADNAN,YOU CAN BUT THE IMPEDENCE OF BOTH THE SPEAKERS SHOULD BE 8 OHM.
Hi Hengilbert This amplifier requires +30 – 0 – -30 Volt hence the total requirement is 60volts. hence you may not be in a position to use 30volt only.
Hi Seetharaman,
Can i have a supply of 0-30v only?And what will be the new diagram?
Thank you seetharaman my mail id is mounicashreya@ymail.com please send me soon
Hi Shreya you require around 500watts RMS Power please wait for some time I will forward a nice high power protected amplifier.
Hi seetharaman
i want hybrid variety
my purpose is to use in open area meetings for a crowd of 500 people (for music and speech)
Hi Shreya what is your requirement a nice suitable reliable design can be published. you want discreate or IC based or hybrid variety. purpose.
Hi seetharaman
why this site has only two high power amps?
i want more high power amps like 250watt 500watt….
Hi Adnan This will be the best power supply suited for this IC. for filter you can add 0.1uF ceramic in parellel with the 15000uF to take care of HF instability.
power supply for Tda7295 ic transformer 24-0-24v @4amp with 6amp bridge with 2x15000uf capacitor is OK or any addition in capacitors are needed?
hai seetharaman but tip 147 and 142 can hadle 100 volt right ,other wise can we change any resistor value to reduce volt
and also please tell me how to reduce 55 volt to 30 volt using resistor value
regrads
jagadish
hai Onkelf i used processor heatsink with fan
cheer jagadish
this is jagadish thank you seetharaman can you please tell me any ic handle 75 0 75 volt and 7 amp
other wise stk 4050 v where i can find
Hi Adnan why not please go ahead use a good heat sink for output trasistors. use 2amps fast acting fuse for + & – power supply line to protect output transistors during an inadvertant shorting of speaker wires.
can i use 2x8ohm speakers in series at 35-0-35v @ 4 amp
Hi Adnan 35 0 35 will give a DC of 50volts which will lead beyond the maximum dissipation of the transistors may damage the output transistors with transients. 30 0 30 will be ideal for 8 ohms speaker. with 35 0 35 use 15 ohms or higher impedance speakers.
Hi seetharaman
subject: 100watt sub-woofer
i shorted R9 & R10 the temperature of transistors decreased but Q7 is getting hotter than Q5 why ?
can i use 35-0-35v @4amp with 6amp bridge with 2x4700uf capacitors for this amplifier?
Hello seetharaman,this circuir required a dual volt supply,but i don’t have a 30v-0-30v transformer,however if i used a 12v-0-12v transformer will this work.You can e-mail me at ajdeane03@yahoo.com.
hi admin wheres the seetha raman
hi if i use 35-0-35v @4A will the amplifier works or not?
And what would the °C/W be per amplifier if the transistors shared heatsink? the best i can get around here is 1,1°C/W
or could i use a intel p4 heatsink with fan ?
for 2 amps *
hello. sorry o bother you with another transformer related question but i need a powersupply 2 of these amps i have recently built. i can get a 35vac 600va transformer for a resonable price, do you think the amps can take it or is +49,5 0 -49,5 volts to much ?
can i use 2n3773 instead of 2n3055?
Hi Shreya the resistances are shown above use 8.2K and 39 ohms you can use BY127 or 1N5404 for the protective diodes.
Hi Jagadish the maximum voltage for transformer is 32-0-32 @ 4amps or higher.
Hi Emmi noise reduction (DNL) at the input of the amplifier.
Hello seetharaman
can you give me noise reduction circuit for this amplifier
any one please help me can i use 75 0 75 7 amps in rail for this circuit i am having 55 0 55 transformer this okey
HAI GUYS STILL I AM USING THIS CIRCUIT ITS WORKING FINE AND GREAT CAN I USE 75 0 75 IN RAIL VOLT IT HANDLE
can you give me the resistance values,diodes and how to connect if you have circuit diagram you can send to mounicashreya@ymail.com
can i use 2n3773 instead of 2n3055?
Hi Shreya sorry i got confused bet 100watt sub woofer and 150 watts. TO3 equivallent with higher power is MJ3001 / MJ2501. if you cannot find them use BD139-2N3055 with BD140-2N2955 as compementry pair for the out put stage with external resistances and diodes to achieve protection.
Hi seetharaman
in the given diagram Q1 and Q2 are not input stage they are in output stage
now tell me the TO3 model instead of TIP142 and TIP147
if we use TO3 type what changes have to do in the circuit
You cannot use in the input stage, TO3 transistors which will generate lots of noise and input impedance will be very low. you have to use low noise small signal high voltage transistors in the input stages.
Hi! seetharaman
i want q1 and q2 to be TO3 type can you tell me the model of TO3 casing transistor
also tell other corrections to the circuit if i use TO3 type
Hi Scot
try the following link. it gives full details including the PCB
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=6&durum=e#sonyorum
I searched the thread, and didn’t see this question. Does anybody have a jpg of the PCB? I would like to make a PCB using laser-printer method, but need a pic. If anyone has done a layout with a PCB creator, please post a link.
Thanks,
Scot
Hi Adnan you will be feeding constant voltage to amplifier but its out put voltage to speaker will vary as per the loudness you want. since speaker is of constant resistance the varing voltage to speaker will produce varying current through the speaker hence the wattage.
plz send me any example or any circuit on my email or here with variable voltage n current power supply??
its mean i will vary both of voltage and current as my load requirement????
Hi Adnan yes you can use for any current from 0 to 12 amps at 30volt. Voltage will be constant as per load requirement the current flow varies. the current consumed depends on the load resistance.
if i have a power supply of 30 volts 12 amp.Is this is possible to get 30 volts 6amperes from the 30volts 12amps power supply?
if i have a power supply of 30 volts 12 amp.Is this is possible to get 30 volts 6amperes from the 30volts 12amps power supply????
no meex its for a 500watts amplifiers
500V/A…? are you sure..? thats alot… thats 500W meaning max 10A on 50VAC ..is that a microwave transformer..? :p
a transformer have rating 50-0-50 500va than how much ampere of transformer is this?
@ADNAN – if u have speakers that need 150W of power and 24V, that means you need: (150W / 24V) = 6.25A for speakers to work at full strnght but its recommended that you use 7A
@ADNAN – nothing will happen, just the transformator (that is supplying your device) will not get hot when working. if you give your device a transformator with 12V and, for examle, 750 mA, it could work but probably not too long. ampers define strenght of transformator, so its like if u need $1.000 every mont but u get $4.000 it will be easy for you to survive but if you need $1000 and you get only $750 you will die :p …hehe….
if a device need 12volts 1 ampere but we give 12volts 4 amperes?what will happen?will the device works or get burn??
In series with the supply positive and negative lead. one at a time if you have one meter only.
Hi sitharaman
Thank you for your reply
The polarity of the diodes is correct
Where i have to check the standard current please tell me
Hi Adnan if you are making a stereo amplifier (two identical amplifiers of above)
Hi Joel check the polarity of bias diodes. short R9 & R10 and check the standind current may come down to just few mA, without any signal input to amplifier. at low volumes it may sound highly distorted. you can adjust these values to increase the standing current to 50mA or so. By shorting R9 & R10 is not reducing the current then there is some wiring mistake kindly check up thoroughly.
Hi Amol I am not in orkut.
Hi seetharaman, are you in orkut???
Hi seetharaman
I have built the 100-watt-sub-woofer-amplifier
The problem is when i connect 8ohms 100watt woofer at minimum sound Q5&Q7 are getting very hot and smoke is coming out from R16 & R14 even though i have used a good and big heat sink
i have changed only R16 & R14 i.e 0.33 to 0.50ohms
i have used 32-0-32 transformer and changed Q1&Q2 as you told me
could you please give your valuable solution to decrease hotness
I am waiting for your reply
what do you mean by 2 channel i cant understand??
Hi AK you can use 50 volt supply provided it is +25 -0- -25 volts. The power will get reduced to around 75watts with 8 ohms speaker and 150watts into 4 ohms speaker.
Hi Adnan you can use for 2 channels and ensure that you use 8 ohms or higher impedance speaker and the output transistors on a very good heat sink.
Hi Amol the bass distortion is due to long DC supply leads to the out put stages. ensure that you use a minimum 16 gauge copper wire and ensure the zero voltage is connected to the metal chassis at the input point only. similarly the speaker common lead should not be connected to chassis it should get connected to filter capacitors common. this should iron out all your low frequecy distortion.
can i use 35-0-35 4 amperes for the above 150w amplifier????
Hi seetharaman, thank you brother i will do it.my another problem is how can i reduce bass distortion without compromising volume range of my amplifire
you suggest me the 32-0-32 4 amperes transformer for this amplifier but this is not available in my market i get the 35-0-35 4 amperes transformer
can i use 35-0-35 4 amperes for the above 150w amplifier????
can i use 50V power supply to this amplifier?
Hi Amol this problem is due to high frequecy also getting amplified along with 20 to 20KHz audio. hence you have to provide a low pass filter in the power amplifier input a 1k in series with the input and fit a bypass ceramic capacitor 470PF to ground. add 4700PF 100 volt ceramic disc capacitor in parallel with each rectifier in the power supply
Hi seetharaman, i have made 8 channel (stk 4141II x 5) for my pc, its working great, but it creates loud noise like firecracker when somebody turns of tube light,fan etc in my house. will u help me to filter such noise??
Hi Adnan incresing current rating of the transformer will not improve anything. It will draw only the required current of around 4 amps.
if i kept the voltage same and increase the current rating to 5A or 6A what will be the output??
Hi Adnan it will work. With 8 ohms speaker you will get around 70watts and with 4 ohms load you will get around 140 watts, with this transformer. (one channel only)
if i use 24-0-24 volts 4 ampere transformer will the circuit works or not?
and what will be the output??
Hi Adnan the ceramic is the dielectric between the plates in this capacitor. Normally their value will be between 2.2PF to 1uF with the voltage rating from 16 volt ot few kilo volts. They are well suited for high frequency application.
whats the working of ceramic capacitors
Hi Adnan by using higher value capacitors in the power supply the transient response will be very clean, in other words the peak power will sustain so you get a very clean bass response.(for amplifying low frequecies you require lots of power)
As the electrolytic capacitors are wound they have an inductive element also in it. Hence at higher frequencies the reactance tend to increase like an inductor due to which the power supply impedance will start increasing with respect to frquency, due to common power supply impedance going higher the circuit will become unstable due to complex feed back due to power supply. Hence to avoid this a disc capacitor which is purely capacitive is used in parallel with the electrolytic capacitors. This is very important esp. in digital circuits.
if i change the capacitor to 12000uf then what will be change in the output?
n why we use the ceramic disc capacitor in supplies??
Hi Adnan that will be fine. you wll get a clean power of 120watt RMS into 8 ohms load. and a peak power of around 225 watts into 8 ohms load.
i have the power supply of 30-0-30 4 ampere with 2x4700uf 50v capacitor with 0.1uf capacitor
is the power supply i s ok for above 150watt amplifier???????
will you publish my circuit of 300×2 watts amplifier???
Sure Adnan…we will!!
Hi Adnan
Go through the specification of the transistor TIP122 and 127 (they are in plastic casing) hence maximum possible power dissipation is is only 150 watts even with an infinite heat sink, so you have to limit the voltage to 32 volts and speaker impedance to 8 ohms if not you will loose output transistors instantaniouly. If the output transistors are of T03 casing then it is different. http://www.st.com/stonline/books/pdf/docs/4132.pdf
then tell me the maximum voltage rating of transformer for the above 150 watts amplifier?????
Hi Adnan to get 300 watts into 8 ohms speaker. Vsg / Z = wattage. Hence you require around 38 – 0 – 38 volt transformer by taking a drop of 4 to 5 volts on out put transistors 40 – 0 – 40 @ 3amps will be the best choice.
ans me
the circuit 600watts amplifier Ive mail you
you tell me that amplifier gives 200watts on 8ohm load at 40v-40v
now tell me how i get 300watt instead of 200watts????
then tell me the maximum voltage rating of transformer for 150 watts amplifier?????
No Adnan it will be too high it will produce around + – 61volts it will kill the transistors immedeatey. it can be used for the circuit which you have sent to me through email.
you suggest me 32-0-32 4ampere transformer but this one i snot available in my market
can i use 45-0-45 4amp transformer?
Hi Roger The filter capacitors are used to convert pulslating AC (after rectifier circuit, you will get one portion of the sine waveform only, say positive going only in a half wave rectifier and both half wave will be positive going in case of full wave rectifier) into pure DC.
hi seetharaman ….can I ask you something…? ..what is the use of filtered capacitor ….that putted in the power supply….?
Hi Adnan No!
can i use 80+0 voltage transformer for 150watt amplifier????
Hi Adnan you have to use positive and negative voltage for LM4702. You have to use 40 – 0 -40 volt transformer.
with 30 – 0 – 30 as indicated in the diagram can give only 100 watts RMS into 8 ohms load. with 40 – 0 – 40 transformer you can get around 200 watts RMS into 8 ohms load.
http://www.national.com/ds/LM/LM4702.pdf
can i use 80+0 voltage transformer for this amplifier????
can i use 80+0 voltage transformer for this amplifier?
Hi Adnan I have got it i will send you a detailed reply on it.
ive send the circuit
Hi Adnan
please send my email id is seethasub@hotmail.com my email id is also available in the latest project mains operated LED circuit
i have an amplifier circuit of 600watts and i want to send u the circuit i want that u suggest the power supply for the amplifier can i send u?if i can then send me Ur email?thank you
i have an amplifier circuit of 600watts and i want to send u the circuit i want tha u suggest the power supply for the amplifier can i send u?if i an then send me ur email?thankyou
tnx for your info setharaman..
Hi Bryce You can connect the volume contron in the input terminals of the amplifier. cold end to common, pot variable point to input coupling capacitor and signal between the earthy end and the other end of the potentiometer.
you can use 50 K for 47K. ( JIS is 25K 50K 100K but western preferred value std is 22, 47, 100)
For baxandal tone contrl any small signal NPN transistor will be OK.
can i use 50 pot to replace 47k pot?
hi seetharaman can i ask about the baxendall tone control that you given, what is the replacement of bc109c? transistor coz its available in our market,,and about this amplifier where can i connect the volume control..?
tnks…
hi seetharaman im new here can i ask about the baxendall tone control that you have given, what is the replacement of BC109C? because its not available in our market and can i use 50k potentiometer to replace 47k potentiometer?,,
where can i put the volume control in the amplifier?,
pls reply,,, thanks
Hi Sanjay Use a 32-0-32 volt transformer with 200VA rating. Use a bridge rectifier of 5 amps rating from bridge rectifier + output and transformer center zero connect a 4700uf 63 volt this will be +45volt. Connect -ve end of the bridge rectifier and center zero transformer a 4700uF 63volt this will be your -45volts. refer to power supply circuits appeared in circuits today.
How to use power supply transformer and capacitor in 150 Watt amplifier circuit give me Ideas Plz?
who transformer to out dc vlots +/- 45v?
Ive build that amplifier its so good, thanks for your article…
Hi Adnan Torroidal transformers are small for the rating. since the magnetic field is fully closed no loss highly efficient no leakage to produce hum and buzz and no heating up. Good transient current response hence nice peak output without distortion. but quite expensive. worth the extra money.
what is the performance difference of normal transformer and toroidal transformer?
why toroidal transformer is prefer for amplifiers
Hi. I want to bridge this amplifier, how i do?. I have 2 aplifiers… Tanks
Hi, I assembled this circuit and it works great. I tried MOSFET IRFP150N power amplifier but it need’s some more pre amplification.
Hi Adnan please send any tried circuit, i will make a prototype and send it to ADMN to publish the same in Circuitstoday. Thanks.
Yes Adnan you can use. But you have to ensure whether your amplifier can feed to higher impedance load. If amplifier is rated for 200 watts into 4 ohms load. you can use two 100watts 8 ohms speakers in parallel. or say 200watts into 8 ohms load, then you can use two 100watts 4 ohms speaker in series
can i use two 100watts speakers connected in series as a 200watts speaker?
can i send u a 500 watts inverter circuit on your email?or can i upload my circuits on your website for the guidance like other circuits?
okay thanks
Hi Roger I dont have one. you can send it to my hotmail a/c i will reply.
seethasub@hotmail.com
hi seetharaman ….. i just want to ask you ..if you have a face book account . because i want to send you a bass and treble circuits. i just want to ask you about the some parts of the circuit…..like the capacitors voltages…. thanks.
Hi Adnan
12 volt 200AH say 10 hour rating 12 X 200AH 2400VAH that is if you draw 240 watts of power it can supply for 10 hours. if you draw 500 watts it may give for little more than 4 hours only. refer to manufacturers catalog for derating.
12volts
Hi Adnan what is the terminal voltage of the battery.
OK let suppose i connect the 5oowatts load power and i connected the 200AH battery plz tell me the output timing of battery and tell me how to calculate the timing of the battery?thanks
Hi Adnan it depends on the load power requirement and rated AH capacity of the battery.
if i have a ups of 1kw and i use a 200amperes battery how can i calculate the output timing of my ups when battery is fully charged
Hi Roger The bridge should be rated for 5amps,
Minimum 4700uF 50volt, one for positive and one for negative. infact i would prefer a pi filter. 4700uF a 0,47 ohms 2 watt ww resistance and again a 4700uF capacitor and a 0.1uF 100volt ceraminc disc capacitor in parallel with it.
All capacitors should be rated for a minimum of 50 volts.
please tell me the value of bridge diode and the 2 capacitors in the supply sides……….. and also the voltages of all capacitors in the amplifier side…….please ….thanks
and also the voltages of all the capacitors in the circuits ….thanks…..
hi guys ,,,,,, can i ask the value of bridge diode and capacitor to use in the power supply of this 150W amplifier….pls,. i need your reply…
will you plz upload a circuit of a digital clock with am and pm indicators,date and alarms
Hi friends you can use 32-0-32 with 4 ohms speaker you will get around 110watt RMS power. with 8 ohms load you will get around 55watts RMS.
Hi Adnan total power supply in the above case is + and -34volt. Hence the max pk to pk voltage across load is 68 volt minus drop across out put transistors say approx 6 volt. Then the pk to pk voltage available across the load is 62 volts. converting it into RMS = (pk to pk / 2 ) / sqrt2. That is 22volt RMS. Hence power = V sq / Z. That is 444 / 4 around 111 wats RMS into 4 ohms.
hi guys. i have a problem, i followed PAPACHIK PCB lay-out and it already finish. my problem is the transformer its required 32-0-32 and we have no available in the market. we have only 24-0-24 6 amps transformer.can i use transformer 24-0-24 6 amp? need your reply guys…. thank you
hi guys. i have a problem, i followed PAPACHIK PCB lay-out and it already finish. my problem is the transformer its required 32-0-32 and we have available in the market. we have only 24-0-24 6 amps transformer.can i use transformer 24-0-24 6 amp? need your reply guys…. thank you
how can i calculate the output power?
Hi Adnan 30 – 0 – 30 volt 2 amp will give you plus minus 42 volt DC @ 2 amps. 164 watts of energy for the output circuit with an efficiency of 80% you will get around 132 watts power output into 8 ohms load.
if i use 2Ampere transformer how much the output will be affected?
Hi Adnan Use 30 – 0 – 30 120Va transformers 2nos with two bridge rectifiers and parellel them on the DC side
excuse me 32-0-32 4A transformer is not available in my market?
30-0-30 2Amp is available tell me what i do?
yes you are right ive succesfully made regulated power supply,22watt amplifier and led emergency light and all the items are in use in my homes but this is not end ill proceed till im alive in making circuits thankyou i learned many thing and i want more
Hi Adnan With 8 ohms load you require a transformer of 32 – 0 – 32volt @ 12Amps.
With 12 Volt AC you will get 220V AC. But if you want to use as an inverter transformer with transistors and 12 volt DC, you will get less voltage, you have to take into account the saturation voltage of the transistor. Preferably 10 to 220 volt transformer you have to use.
Thank you Adnan I prefer to clear the technical doubts of the constructors so that they will have confidence in building a project, once they are happy with the successful completion of their first attempt it will make them involve more in the subject and learn more.
thankyou for all replies you are a very good learner and helper thankyou Seethaaraman god bless you
ca i use 220 primary and 12 volts secondary transformer in reverse to get 220 volts if input is 12 volts?
and transformer can operate just in ac volts or also operate in dc volts?
its mean a bridge amplifier requires 16amperes so i have to use a 16 amp transformer am i right?
Hi Dedi Being an electronic hobbiest must have tried lots of circuits. kindly share your ideas, circuits and experience with our readers.
thanks for your good articles. i’m a electronic hobbiest
Hi Adnan for bridging no increase in voltage is required in the supply but the current capability should be 4 times, if the speaker impedance remains the same. It is always preferable to use a speaker with little lesser power handling capacity than the amplifier. Say around 80 to 90% of the amplifier rated capacity. 800 watts speaker will be ideal. The reason you can discuss with any loud speaker repair expert, he will explain you in depth.
last time you suggest me the 32-0-32 toroidal transformer for the power supply of this amplifier but when i bridge this amplifier it requires high voltage and current so suggest me the new transformer according to the bridge configuration?
and 1200watts max input speaker is fit for the 900w output or not?suggest me the diffrent speakers for 900w output
Hi Adnan This amplifier as such will give you (30 sq / Z)with 8 ohms around 110 watts RMS. into 4 ohms will give you 225watts RMS. In the bridged mode 900Watt RMS into 4 ohms. OK this is theory. The actual out put power depends on the output darlington transistor and the power supply capability. With 8 ohms with the present darlinton pair you can get maximum 200 watts into 8 ohms that too with a good heat sink and cooling. 4 ohms not recommended.
tell me that if i made this amplifier 2 times and then i will bridge them then approximately how much output in watts i’ll get in 4ohms?
Hi Adnan you can try NTE251/NTE252 NPN-PNP complimentry darlinton pair they are in TO3 casing with a good heat sink it can give you higher power in bridged mode. The following site will give more details
http://www.nteinc.com/specs/200to299/pdf/nte251.pdf
http://www.national.com/appinfo/audio/files/BPA-200_Application_Note.pdf
can i replace any other darlington transistor for more high out for example i want to increase the output at 600watts can i change the darlingtons?
tell me that if i made this amplifier 2 times and then i will bridge them then approximately how much output in watts i’ll get in 8ohms?
Hi Adnan if you use an infinite heat sink with forced cooling you can achieve 62.5 watts dissipation maximum from these transistor. with a small head room you can achieve 50 watts dissipation. hence you can achieve only 200watts maximum with an 8 ohms speaker. if you want more power you may have to parallel more number of transistors so that the current can be shared between them. the design will become complicated with protection circuit current limitting etc etc. this is a simple design for a clean 100 watts RMS into 8ohms speaker.
Hi Adnan any good quality transformer can be used. secondary should be 32 – 0 – 32 volt (64 volt with center tapped) with a VA rating of 400 minimum.
After bridging with the power transformer as above you will get a guaranteed minimum of 200watt RMS power into 8 ohms load.
Go in for a good standard make loud speaker with a power rating of minimum 150 watt RMS.
after bridging this amplifier it will give 600watts in 8ohms speakers but if connect the 4ohms speaker thern waht will be the output?
and if i use 2ohms speakers then what will be the output?
after bridging this amplifier it will gives 600watts in 8ohm speakers but if i use 4ohms speakers then what will be the output?n if i use 2ohm speakers then what will be the output?
how much current a bridge amplifier will required?
and what is the suitable speaker for the amplifier after bridging i mean to say how much watts speaker will i connect?
n if toroidal transformer is not available then waht i sthe replacment of the toroidal transformer?
thanks for last reply
and which typt of transformer configuration i use 32-0 or 32-32?
Hi Adnan you can use standard 32-0-32 @ 4Amps torroidal transformer with 6amps bridge rectifier and 10,000 uf 63 volts X 2 in parallel with 0.1uf 63 volt is the best power supply with 2 fast acting fuse of 2Amps rating for each channel in both +ve & -ve power supply.
for input voltage which transformer is the best and how much current limit of transformer
Hi Sowmya you might have gone through my approach in checking the design of automatic LED emergency light. we can analyse in depth each design. if you have any doubt in any part of the circuit that alone can be assembled and the performance can be checked.
ya,,,this is a hot & active topic,i also suggest my friends for apply this.one things,each & every circuit application is not possible for me but i want to verify this so if u send me any procedure to check the circuit that will be better & i also be satisfied most.if possible make me member of this.i want to do something on circuit.
Hi Adnan
The following site gives you the details
http://sound.westhost.com/project14.htm
you can use it successfully with any two identical amplifiers to boost the out put 4 times
Hi Sheryll With MP3 player you may not face pboblem, if you use a low pass filter as i have idicated, 1K in series with the input and a 470PF from it to ground. (please refer motional feedback amplifier circuit)
with cell phone you may get interference heavily if the amplifier is not screened properly and grounded, if you use the cell phone at a distance with long connecting cable you can avoid the interference to a great extent. it is only atrial and error method.
hi seetharaman my input signal is mp3 player/cellphone
plz upload a circuit diagram of bridged amplifier configuration of 150w amplifier i have a woofer which required 600w input so help me how can i bridge this amplifier for 4 times output thankyou
Hi Adnan you assemble 2 amplifiers and bridge them you will achieve 4 times the power. But power supply should be capable of providing the additional current. 4 times the requirement. the heat sink for output transistors should be very large.
Hi Sheryll slider I mean the varable portion of the pot (the center tag). 50K rotary pot is fine. may be your input signal is very high what is the source you are using. use a 2.2k to 4.7k in series with the variable tag of the pot and the input capacitor C2.
Dear Seetharaman,
I don’t have 47K slide potentiometer.. I used 50K knob potentiometer but when i turn the knob to max resistance there’s a noise. The volume did not change..
excuse if i build this amplifier 2 times and can i connect this amplifier in series to get 300watts output if i can then tel me how
thankyou
Hi Didi the following sites have plenty for your requirement plus transformer data.
http://www.bonavolta.ch/hobby/en/audio/807.htm
http://diyaudioprojects.com/Schematics/Mullard-EL34-Push-Pull-Dynaco-A420-Tube-Amp-Schematic.htm
http://www.nijnkonijn.nl/machmat/schema/ppp.htmhttp://www.dvq.com/hifi/images/acro.pdf
http://morenclosures.com/pdf/5c_1650A.pdf
Hi All,
have you a schematic diagram with power amplifier using the vacum tube like EL34 or 807,push pull ballance and complete the impendance with output transformer and input transformer?if you have pleas send to me via email..
regard’s
from Jakarta,Indonesia
Hi Sheryll You can use a 47K potentiometer slider to C2 (10uF) negative and one end of the pot to common. Now connect audio input from any source between both the end of the pots ensuring that the signal of the input source is connected to free end of the pot and the screen (common)to earthy end of the pot.
Thanks Seetharaman.. My problem is in the heatsink.. There’s no heat transfer that’s why the transistors keeps blowing up… thanks again…
Another thing, can i add a volume control in this circuit? How?
HI Deedat do you want the complete design calculation.
can you give me the computations of this design?i need it badly…thanks
this is the great circuit…….thankssss….
thanks for the tips …………
Seetharaman,
Thanks for the tips. I will try them out and get back to you.
Hi James a 200watt rms into 8 ohms, rugged mosfet mono amplifier module will cost you around US$200 plus power supply (Plus, minus 50Volt minimum) pre amp etc. assembled ones will be quite expensive. you may visit the following site.
http://www.marchandelec.com/pricelst.html
Hi anyone everyone
I need to boost my passive woofer which reads as 6ohms
200w max, what could be the cost, to drive it as good
as the powered woofers in the 5.1 sets.
Regards
James
hi prem 32-0-32 is the right transformer to get + and -45volt dc.
hi sheryll try by reducing HF boost at high volume, if output transistors are not getting heated up after this (with HF cut) it looks like HF instability due to layout problem, High frequency instability are not audible but the current drawn will shoot up indicating instability. Try a 100PF disc capacitor between collector and base of Q3. A HF filter of 1Kohm resistance series connected with 470PF ceramic disc capacitor to ground at the input of the amplifier before C2 should help.
I just tried the circuit but the TIP142 and TIP147 keeps blowing up. The first time it blew up in a few seconds. After working on the heat sink I got it to work for a few minutes with my mp3 player’s volume set to 5/10. But when I turned up the volume to 6/10, the transistors blew up immediately. I am using 8 ohm speakers. my power supply measures 47 volts on the + and the – side. What am I doing wrong?
this an use transformer 32-0-32 5amp pls reply me..
Hi Soumya you can use any baxandal tone control available on the net, ensure that the circuit uses dual sulpply (+15 – 0 -15), if you want to use the inernal supply with suitable dropping resistance and regulator etc. if it is external can be any circuit available on the net. if you want mount it internally http://www.ecircuitcenter.com/Circuits/op_tone1/op_tone1.htm for external set up http://www.zen22142.zen.co.uk/Circuits/Audio/t-ctrl.htm I always prefer a passive tone control, added with an amplifier of 20 to 50 gain. which will be more stable than active type, if you have not taken care, which may become unstable if you give higher level of boosting for the signal esp. HF(treble).
circuit is ok. If i want to apply bass & treable with this circuit,how can i connect?
Hi Ptero the site given by Papachik gives full details. The PCB (PWB- Printed Wiring Board)) layout is good (only with 2 links). You may try it. I am planning to get the PCB done.
any one will share the pcb layout.pls give us the link or post it here
I have three questions.
1) Can you run this with just a TIP142 and bypass the TIP147 for lower output or do they absolutely have to compliment each other?
2)Is there a way to power this off of a single voltage rail (I.E car audio, DC adapter, etc)
3)If yes to question 2, what needs to be changed to bring current requirement from 45volts to approx 10,12 or 14?
Thanks in advance,
Bob
Hi
Any one have FN1016 based subwoofer amp circuits
simplest amp assembled. few components but high power = JG
Bought the components but no time to built yet . Have a look at this site for the PCB .
http://www.diyaudiotr.com/islecler/tammetin.php?metinid=6&durum=e#sonyorum
This is the cheapest circuit i have discovered and try it it’s pretty amazing it only costs PHP 300.00
can i supply this amp with 30volts?
Dear Sir,
I have change the 2N3903 transistors to BC557 and is still having problem to get the output signal to the speaker.
Are these the correct transistors TIP 142, 147 and 41 and is this the correct voltage to feed the circuit 45v 5A.
All the other components used are rated according to the diagram posted on this site. I don’t want to give up at this time please help me.
I am looking forward for you urgent respond and any members who have completed this project and got through please assist me.You can contact me on my email at ajdeane03@yahoo.com
Best Wishes
Anthony
Reply to Anthony Deane
All transistors are correct. I think there is no problem with the circuit. Pls check your circuit and components.
Many guys have successfully assembled this circuit .
Dear Sir,
I have reciently build this 150w amp, all the components used on the circuit are of the correct values, except for the Bc558 transistor. I was given the replacement value which is 2N3903 transistors.I connect them according to the diagram you post but when I powered this amp I am not getting an output signal to the speaker. When I test the circuit the power is going to the 1st transistor. What diganosis can you give me to solve this problem, please email me at ajdeane03@yahoo.com thanks.
Reply to Anthony
2N3903 is NPN and it is not a replacement for BC558 which is a PNP transistor.That’s the problem.
2N2907, BC158, BC557, BC177 etc are the suggested replacements for BC558
Dear Manoj you can built any preamplifier using both positive and negative power supply if it is to be built in as the output amplier is with dual supply. For externally powered pre amplifier I have tried with Two transistor tone controller circuit appeared in these column and found to be sounding perfectly alright. Kindly inform what are the inputs you wand to handle. happy listening.
Hi Nr Gregtherider Yes with one end of the transformer connected to center of two filter capacitors connected in series. other end of the transformer to anode of the first rectifier and also to cathode of second rectifier. cathode of first rectifier to positive end of serially connected filter capacitor and anode of the second rectifier to negative of serially connected filter capacitor. serially connected Capacitors center is taken as zero volt. Only problem is i have to use double the value for the filter capacitor to reduce the ripple and hum. I have used 2 X 4700MFD 63Volt each for both positive and negative supply.
kindly send your email id to seethasub@hotmail.com for detailed circuits
@ SEETHARAMAN: Can you please tell me how did you make +-30V from 30V transformer? Voltage doubler? Some schematics would be very helpful!
Hey
I really liked the circuit seems pretty good. I wanted to build this aong with an uA741 preamp circuit i was wonderin if tht is good or do u have better pre amp circuits in mind?
hello; my problem is the transistor you giving is tip142=tip147 i go to the shop and they ask me tip142=147 is [b or c} can you tell me b or c reply me soon as possible than you.
regards 2 Ryan….gudluck 2 your circuit project!!!!
u can e mail me at cled_alagban2000@yahoo.com hello 2 all cicuit fanatics!!!dis web is very helpfull…
no comments it work fine….i built dis one
hELLO ,PLEASE I NEED CIRCUIT DIGRAM ADUIO POWER AMPLIFIER
STERRO 150 W(TRANSISTOR & I.C)
Hi,
All of the comment are mostly technical but I would like to know with the suggested diagram and parts is the sound good?
If I connect this to the output of my PC sound card will it be OK?
Thanks!
Sound quality is fine
Hi, my name is emmanuel from malawi. i tried the circuit and it worked just fine but not for me. so i tried these 200watts 16Amps BDV66D and BDV67D as output transistors but “Hey people” you cant imagin the power that a simple amplifier like this can output. plz change the 33k resistors to 3.3k and increase the wattage of 0.33 resistors to 10 watts. i also have designed a simple hyper bass circuit that works fine with any type of amplifier | it produces exactly hi-fi sound with only ten components|and i would like to share it with you friends. use this email address and the next moment, it will be in your inbox (emmanuel@windowshoppingmalawi.com)Thanks to admin
hi…i have decided to use 2N3055 TO-3 type transistor instead of TIP142 and MJ2955 for TIP147..Is it OK???
Hi
I am making my sub woofer , i am going to try with TIP 142/147 transister only, suggest me on the same, which will be good amp for building sub woofer
Hi Cedric
if 4 diodes are used it will become a class A amplifier, you require a large heat sink to take care of the out put transistor heat dissipation. to operate as class B push pull out put, the out put transistors to be biased just short of conduction hence a maximum of 3 diodes can be used to avoid cross over distortion in these circuits. Happy listening
The boostrap capacitor C1 should be 100 MFD not 10MFD as shown (volume and bass response improved dramatically). I have used a 15-0-15 5amp (150VA) car battery charger transformer using as 30 volt transformer and a voltage doubler. to remove the instability and output transistor getting warmed up due to spurious oscillation I have added 100MFD with 0.1mfd in parallel in both positive and negative power supply in the board and also 100PF capacitor between col and base of TIP41. a simple HF filter 1Kohm with 470PF also added to the input circuit. the performance was amazing for such a simple low component count circuit. wishing you all the best for your nice contribution. pl keep it up.
is this circuit still operational at +-33V?? please reply
This circuit will work on +/- 33V, but the output power and performance will be reduced.
Hi
I wonder if this amplifier can work as bass guitar amplifier?
Thanks
hii have made this circuit and it is working good i just need to know that it is 33k or 3.3k and i it is tip41 or tip42 can u pls sugest me
PLS clarify that
a) 33K should be read as 3K3 for R5 & R3
b) The TIP147 gets warm in the absence of an input,about 25mv appears at the output.what must be done to achieve 0 output in the absence of an input? please help
c) All transistor amps should have zobel rc networks to keep the amp stable. (10 ohm and a 100n cap will be fine.
d) I saw an another circuit like yours but there has TIP41 and not TIP42
e) can 0.33E be replaced by 0.3E 10 W
PLS modify the Circuit accordingly on the WEB site
In the diagram the transistor Q3 is described as TIP42 (PNP). It must be a TIP41 (NPN)
Yes, you are correct. Q3 is TIP41. Typing mistake from my part. I have corrected the circuit diagram now.
Hello, I simulated this circuit on LiveWire and found that it performed the same with or without C1 (1kHz – 15kHz). Any reason why it is there?
im using +/-18v and instead of the 27k resistor in using a 22k+4.7k in series to get 26.7k and im getting distortion. Are one of these the cause?
Hi there,I’m from South Africa..I was suprised how cheap this project costed me compared to quality and power (except for the 300VA transformer I bought..Costed me a fortune!! But nothing to worry about if you can find a suitable one in your scrapbox or garage or wherever)..I just wanted to know,if I want to increase the amount of output power (about 400W or so),should I only repeat the two output transistors and resistors R8 & R9 and put it in parallel?? Thank you
this is gr8 ckt . but how can i add bass treble ckt to this ckt . pls ans by circuit diagram
this circuit works amasingly,but how can i add bass treble circuit to this amplifier?
Hi. I am writing from East Africa, Nairobi City. I assembled the 150W circuit using a 50V-0-50V, 3Amp dual power supply. It works great with my 4 ohms, 300 watts speaker!! Its the cheapes amp I ever built! Thank You Admin.
I want Stereo Sound of it.
Give a Suitable Power Supply 2* 150 = 300 W.
Is the speaker 8 Ohm or 4 Ohm
Sir. I am a student of jetking. I extreamlly need a very powerful amplifier circuit diagram with bass and trable control with supply 12v though IC not transistor. Please Help Me.
There are many amplifier circuits in the audio circuits section.
pls have a look.
Is this circuit enough for you
http://www.circuitstoday.com/24w-amplifier-using-tda1516
There could be some simple mod’s to keep this little amp more stable, even adding a componet to bridge this little guy, 300w @8 ohms… more so led bargarth to show power out put and a 22k log pot at the input stage as not to drive to much in put signal in and clip the o/p….
Hello to all, very simple circuit indeed.
the ’33k’s are 3k3 types, all transistor amps should have zobel rc networks to keep the amp stable. (10 ohm and a 100n cap will be fine.
Someone did ask ‘why use diode’s this is to help bais the amp… quick psu design would be 220va transformer and filter dc caps 4700uf say 63v’s. and simple 3 second relay timer between the o/p and speaker circuit will stop turn on/off thumps.
from manila.
i just want to ask if their are any transistor that can replace for TIP140,TIP147,TIP42 and im using Multism7 for the simulation.need reply asap tnx
Hi,
iam new to this site i have seen the diagram i like it but i would like to know weather the transistors are available in the market???
hi can you give me the power supply circuit diagram of the 150 watts amplifier. I don’t know the diode that i put in or the capacitor the i place in the circuits.
i have added the power supply circuit.
pls check http://www.circuitstoday.com/40v-dual-power-supply
Is it really possible to use an MJ11028 and MJ11029 instead of TIP142 and TIP147?
admin is correct
4500W PMPO (peak maximum power output)is non existent and is only there to entice wangsters with mine is bigger than yours.
If a circuit was capable of delivering that sort of power, imagine how big it would have to be. Definitely beyond the means of any body wishing to build the circuit themselves. And just imagine, if you were capable of building it, would you be able to listen to it.
helloooooooo , give me a 4500w pmpo ckt ………. plzzzzzzzzzzzzz
PMPO is just an advertising stunt made by the manufacturer to confuse the customers. PMPO is the output that could be obtained from an amplifier with 100% efficiency at ideal conditions for certain frequencies and so on.The requirement goes long.Anyway this is absolute non sense and impractical.
4500W is hell of power.Have you notices one thing?. The power consumption stated on the back side of a so called commercial 4500W PMPO music system or amp will be only few hundred watts. How can they produce 4500W of output from few hundreds of watt input.
The real and practical representation of power is the power in rms (Wrms) and you need to be concerned only about the rms Wattage.
A simple, cheap and elementary 150W rms amplifier will produce more blast than a so called 4500W PMPO amp.
I follow the rms scale and so do my all circuits.
YOUR CCT. WORKS WELL BUT THE TIP147(NPN) WARMS IN THE ABSENCE OF AN INPUT. I MEASURED ABOUT 24mv AT THE OUTPUT.PLS. WHAT MUST BE TO GET O OUTPUT IN THE ABSENCE OF AN INPUT?
The TIP147 gets warm in the absence of an input,and i noticed about 25mv at the output.what must be done to achieve 0 output in the absence of an input? please help.
THANKS FOR YOUR EXCELLENT CCT. PLEASE CAN I GET A CCT DIAGRAM OF A TONE CONTROL,PREAMP,EQUALIZER and A NOISE REDUCTION CCT? HOPING TO HERE FROM YOU SOON.
most of these circuits are in the site.pls look out.
the regard,I from russia,has collected this amplifier,but with three diodes and consecutively to him resistor 22 ohm,when garbling less.
вопрс,possible 142 147 change on MJ11028 MJ11029?
Hello there
I want to ask u , what is the maxixmum cuurent i nedd to supply the amplifier and what is the maximum output current?
Well I build the amplifier with a + – 50v /7A and I run it , I raise the volume from my computer but the level of sound in the output of the amplifier , was not the level of sound I was expected to hear in a amplifier 150W , why is that problem ?( In this circuit I use TIP147,TIP142,TIP41 and the resistors 3.3KOhms)
Another problem I have here , is that I only can find the resistors 0.33Ohms in 5W , is that a problem ?
And something last I want to tell u that I saw an another circuit like yours but there has TIP41 and not TIP42 also it had RESISTORS 3.3KOhms 1W and not 33kKOhms 1W u have here . I want to know witch circuit is the right.I try your circuit with TIP42 and R=33KOhms 1W and didn’t work , then I try the other wicth uses the TIP41 and R=3.3KOhms and it worked but I had that problem with the sound.
Plese answear my Reply Thanks!
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hi
it’s very nice circuit..
can u send me it’s block diagram of working on my e-mail id i.e. er.patidar@rediffmail.com
i want to make it circuit as my minor project..
one more thing, if u have any protection circuit for this above circuit then please sene me it also..
pls help me…
piyush patidar
indore (india)
hi..I from Philippines
this is a great AMPS but my problem is the wattage 150W. I decided to change the TIP142 and TIP147 to MJ11028,MJ11029 darlington pair to get a 300 watts,but the same TIP41 and the same supply voltage.It is good? or working Properly?
thanks..
hi..I from Philippines
this is a great AMPS but my problem is the wattage 150W. I decided to change the TIP142 and TIP147 to MJ11028,MJ11029 darlington pair and the same TIP41 and the same supply voltage.IT is good? or working Properly?
just E-mail me.rj_john23@yahoo.com
thanks..
Is it o.k. if I connect the metal of the transistor to the Heatsink or in ground.thanks.
i have a transformer from an old pioneer
can i build a new power supply with it. it was a 280watt stereo so the transformer will be enough? and i think that the transformer gives -120 gnd +120 but i dont know how to build a power supply that will give
-45 0 +45 with enough power for the 150watt amplifier, and will it be enough for 2 amplifiers.
where would it be best to put the volume controll ?
and VU meter ?
can i ask why do the tip147 smoke and wrecked when i turn it on? is there a problem of the supply, because i used 35 0 35 15 amp… or the low resistance between the two bc558 the 1.5k i used 1k 1/2 watt.. as well as the 2 resistor 0.33k 5watts only? can you help me. whats the prob? i just want to creat the amplifier. pls. thanks..
Hey,i’m dare from indonesia
= that’s nice amp. i’ve try it once,not dissappointed . but i need some with transformer output ,coz i”m working on 120 watts sirine ,can i modify this circuit?? —
I try to built this circuit at home but I can’t buy 7 watts .33 ohms resistor, only 10 and 5 watts is available here our market. Can you suggest what resistor will I use.
Reply: No problem , use the 10 W resistor.
Are the 33K 1W really 33k or 3.3k. Also, TIP 142 and 147 are darlington, you put two diodes (1N4007) to compensate the crossover distortion, because the transistor are darlington, should it be preferable to put 4 diodes ?
comment : I was just curious since I don’t work with transistors that often. My background is in opamps. Is there any benefit to stacking two of these transistors in parallel? I thought possibly more headroom or faster bass response. any input?
Ans: i don’t think there is nothing more in putting the two transistors.I am a transistor man that’s why i just included these two transistors and they are found to be OK.If you you want to go with opamp OK no problem ,it will surely provide some better low freq response
.but have to check it .Any way I will try your suggestion soon .Any way you go with your opamp design .This is a cheap design so nothing to loose.it should work. any way best of luck.great circuits are born with experiments.
jimmy:
I am interesting about this circuit and I want to assemble it in double (for Right and left). Are there some want who knows what kind of transformer I could use to provide the power supply?
I have looks for this one (167S64) but it is 64 volt CT 10 amps. I don’t know if the voltage is too high?
I thing I could also try with 2 167P50 (50volts CT, 5amps) but that will be more expensive.
I don’t know what could be the best
Thanks for help
Author:
A power supply for each channel is the best option,because it will reduce distortion theoretically.Here we cannot expect this because this is a cheap and simple design .
I prefer to make this circuit as cheap as possible.I used a 45-0-45 transformer and the result was just fine.You can use up to some 65-0-65.Above that may cause some extra pressure on the transistors ,and I have not tested that much high voltages as supply for this circuit during test.You can gamble with this circuit because this is a cheap one .Any way my preference is 50-0-50.
If you have a 65-0-65 already with you ,you can try that.Other ways a 50-0-50 will be enough.Thanks for the comment.
sir,
will this circuit works on 22-0-22 dc dual power supply.I have seen one circuit with transistor 3773 100w in this site.Which one will sounds best please help me.Which one has low distortion.
Use the following link and use the pcb design. you can also incorporate the improvements shown to the circuit, which are useful and also incorporated in the PCB.
http://pcb.jspayne.com/150wattamp.html