150 Watt amplifier circuit
Description
This is the cheapest 150 Watt amplifier circuit you can get,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 transistorsQ5 and Q6 are wired as pre amplifier and TIP 142 ,TIP 147 together with TIP42 (Q1,Q2,Q3) for driving the transistors.This circuit is designed so rugged that this can be assembled even on a common 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.
Circuit Diagram & Parts List .
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.
TIP 142 & 147 Internal diagram and pin out.
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.
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.
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 ?
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.
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?? —
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..
where would it be best to put the volume controll ?
and VU meter ?
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.
Is it o.k. if I connect the metal of the transistor to the Heatsink or in ground.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..
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
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)
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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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?
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 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.
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?
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.
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.
Is it really possible to use an MJ11028 and MJ11029 instead of TIP142 and TIP147?
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
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???
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
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.
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….
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
Is the speaker 8 Ohm or 4 Ohm
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.
this circuit works amasingly,but how can i add bass treble circuit to this amplifier?
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
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?
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?
In the diagram the transistor Q3 is described as TIP42 (PNP). It must be a TIP41 (NPN)
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
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
Yes, you are correct. Q3 is TIP41. Typing mistake from my part. I have corrected the circuit diagram now.
Hi
I wonder if this amplifier can work as bass guitar amplifier?
Thanks
is this circuit still operational at +-33V?? please reply
This circuit will work on +/- 33V, but the output power and performance will be reduced.
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.
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
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…i have decided to use 2N3055 TO-3 type transistor instead of TIP142 and MJ2955 for TIP147..Is it OK???
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,
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