100 Watt sub woofer amplifier.

john January 23, 2018 819 Comments

Description.
This is the circuit diagram of a fully transistorized sub woofer amplifier that can produce an output of 100W.There are seven transistors including four in the output stage. The transistors Q1 and Q2 form the preamplifier stage. Transistors Q4 to Q7 form the output stage. Since no ICs are used the circuit is very robust and can be easily assembled on a general purpose PCB.

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Circuit diagram with Parts list.

Notes.

• The circuit can be powered from a +35V/-35V, 5A dual power supply.
• Use a 100W, 12 inch sub woofer at the output.
• All electrolytic capacitors must be rated 100V.
• The transistor Q4 to Q7 must be fitted with heat sinks.
Comments
• Andrew
September 22, 2018

Have a 100 watt amp-522 what are the colors on it the colors are Orange wire in a red wire in a black wire any answers

• Rakesh Kumar
July 27, 2018

sir plss suggest something about, alter for 0.33 ohm 5 watt resistor

• auxtics technologies
September 1, 2018

you can use 0.47ohms 5watt 0.5ohms 5watt or any other close to these values, there will be no problem.
For the Free PCB and a detailed video tutorial of this project
check this link

https://www.youtube.com/watch?v=Mr_5rnBxzAc&t=939s

• satish mor
November 26, 2017

Resp. sir
plz tell me the circuit of 250 watts operating by 12 volts.

• November 12, 2017

Hello sir,
I have built this circuit and it is working fine. I had power up with +/-27 volt and sound is very clear and clean. But C2 polarity shown wrongly in this circuit. With wrong polarity of C2 amplifier will not work and R13 will brunt. So keep +ve side of C2 towards GND.

• sajeersha
December 18, 2017

could you please explain the 27v power supply for me.

• jude
October 9, 2017

where can get the crossovers/stereo from?

• ramesh harijan
September 22, 2017

I made an amplifier using the ta72222 ic to make it sound slow in the sound of what’s going to happen. please help me…sr

• Frost
September 4, 2017

Hi Seetharaman,

I’ve built this circuit but it doesn’t work. Resistor R16 and R14 are heating up and I’ve used a 24-0-24V/5A transformer which gives a DC output of 36.7V. Any workaround for the heating problem would be appreciated.

• Davendra Kumar Sharma
August 11, 2017

Dear sir,
Please send me the Power supply circuits for 2.5-4 amp, 24 volt DC power supply.
I need this circuit , my 01 machine is under B/D due to brunt of same powe supply.

Regards,
Davendra Kumar Sharma

• Merin
May 12, 2017

Sir..I’m planning to set a basstube and speakers at my home
please suggest me a amplifier for doing this

• chandu
January 30, 2017

hi, sir i have 150 watt, 8ohm, subwoofer ,its support to 4.1 home theatre audio board ???? once its can’t supprt then wich type of audio board i can use plzz tell me sit

• December 3, 2016

Sir
I have 2 doubts….plz help
1. Can I use. 0.5ohm 10w instead of 0.33
2. I don’t get 1.5k 2w….So can i replace it with 1k 2w
Plz help me sir…
Thanks

• Mani deep
November 25, 2016

Hi,
I have a doubt.
Is this circuit only a low frequency amplifier or it is just a high power amplifier?
What I mean is, will the subwoofer connected to it produces only low frequency effects or both low and high frequencies combinedly when connected to a 2 channel auxiliary analog sound input(like the mobile phone)?

• Manideep
November 21, 2016

Hi sir,
I want to know where to put the volume control for this! Plz tell me the position and rating of the control.

Thank you.

• Jithin
September 7, 2016

Can any one tell me the minimum voltage and current that we can apply ?

• MICHAEL
April 24, 2016

Hi Mr.Seetharaman, can I use your 150 watts amplifier as a subwoofer amp in my 12″ 8ohms 200W subwoofer instead of this 100watts sub- amp as shown obove?

any suggestion will be very much appreciated.

thanks.

• March 28, 2016

Can you please help me with the explanation of functions of each component for the whole circuit. Please.

• March 15, 2016

Gud pm sir ….

can i ask for the value of the resistors and how many volts do i have to use in capacitors

tnx and god bless

• burhan
February 16, 2016

i want parches in this plz. contact

• jojo
February 16, 2016

@burhan – we dont sell this as kit now.We will definitely add this kit later!

• March 8, 2016

sir what is Q4 and r 8 or c 2 means and you given the numbers also , how i can recognize that that is register or what is mospet or diodes , i means this diagrams shows numbers but iam a fresher how will i know what will be placed where codes are in short cut plzz clearly define codes like q8 and c2 or r 8 etc what they means ,

• stephen
March 20, 2016

it doesn’t work. i simulated it, it has a explotion on it

• prudhvi
February 2, 2016

so, I’ll be using a low frequency pass filter from a pre-built multimedia speaker system. & I don’t have any problems regarding the circuit. but, I am unable to find or harness the input voltages which are +/- 35V. what should I be doing to, get those voltages. what rating of transformer should be used?

• prudhvi
February 1, 2016

Well that was a stupid question which I asked. I should be using the low pass filter. so, the last remaining doubt for me, is Power supply. what should I do? and will it put 100W Rms into a 8inch 100W subwoofer when the Input voltage is +/- 35V ?

• prudhvi
February 1, 2016

should the input fed into the circuit be after processed low frequency ? or could it be normal stereo input ? and as this circuit is based on transistors, should the power supply a AC supply be used? i’m unable to find +/- 35V power supply. all I could find is a 14V AC which when Rectified gives a total output of 18~19V DC. so, what should I be doing? Thanks in Advance.

• January 24, 2016

Unable to understand where to connect volume control, bass control and terrible control will be placed on the circuit….Plz help me

• MOoN
October 12, 2015

Hello sir,
I hope that u will be fine. Sir, I want to making an amplifier. So please guide me. Which is the best circuit,”100 watt or 150 watt.”
Thank you,
MOoN.

• rameshkumar
September 8, 2015

Sir I want to 12battery volt to 24-0-24 5amp circuit diagram and spares please

• June 3, 2015

sir stk 4141ii ke liye 24v-0-24v 7amp ka transformer chalega

• Anuj
November 19, 2015

no current is high you will damage stk i c

• Shivam Vats
May 16, 2015

Sir
Can you please give the circuit diagram of a +35V/-35V, 5A dual power supply to power the
100W-sub-woofer amplifire.

Thank you
Shivam Vats

• Pramod Manuja
February 26, 2015

Can i use 1/4 W resistors instead of 1/8 W resistors.

• January 26, 2015

sir can i use 2 * 50 watt woofer in series

• January 5, 2015

Dear Seetharaman Sir,
Is there any 300 watt stable Amp circuit to drive 4 Ohm subwoofer?
I got one circuit on below link…….. Is it good for my CAR subwoofer?
Please suggest.
http://www.amplifiercircuit.info/2014/04/300w-subwoofer-amplifier.html

• January 5, 2015

Dear Seetharaman Sir,

Is there any 300 watt stable Amp circuit to drive 4 Ohm subwoofer?

I got one circuit on below link…….. Is it good for mu CAR subwoofer?

Please suggest.

http://www.amplifiercircuit.info/2014/04/300w-subwoofer-amplifier.html

• aiza basquina
December 18, 2014

Try this 300W Hi-Fi mosfet Amplifier http://adf.ly/vNFeo. The sound is superb.

• Gautham
December 18, 2014

Hi i want to know,,,, is this possible
Normal stereo amplifier to subwoofer amplifier
Convert -> Normal -> Sub ?????????

• BALASUBRAMANIAM
January 5, 2016

Yes possible

• Aiza Basquina
December 17, 2014

https://www.dropbox.com/s/hfbutrjfovjimt8/100W%20Subwoofer%20Amplifier.zip?dl=0 this is the pcb layout comes from sir seetharaman. Install pad to pad software to open pcb file. Thank you very much sir for the layout.

• Aiza Basquina
December 17, 2014

Pcb layout for 100 watt subwoofer amplifier.http://adf.ly/vLIxB

• pat ramirez
November 22, 2014

Hi Sir… can you please send me your PCB layout of this circuit.Thank you in advance. God Bless You.

• Pascual
November 16, 2014

Hi Sir Seetharaman can you please send me your PCB layout of this circuit.Thank you in advance. God Bless You.

• SEBIN JACOB
November 15, 2014

Dear Seetharaman Sir,

i am using this circuit as a subwoofer amplifier for past 3 years…working fine..but when i am using it as an amplifier with out any subwoofer filter then the 2m3773 is getting hotter when it is worked at its full volume.Plse help me to rectifiy this because i love this amplifier it sounds good and simple to make

• SEBIN JACOB
November 13, 2014

Dear Seetharaman Sir,

I was using this amplifier for past 3 years i checked my amplifire recently and i found the resistor R13 100R 2W is blown. it is not actually blown but it is burst out.i replaced with a new one and i found that while working the R13 is getting very hot but the amplifier is working properly. please help me to resolve this problem sir.

• Toby
December 2, 2014

Make it 150-200Ohm 2 watts.

• November 2, 2014

use the high quality pre amp (nokia samsung etc branded phons) to the amp high quality sound.with out tone sercute.

• October 28, 2014

wow…i made this sercute solidsound..

• Pascual
October 15, 2014

Sir in mfb amplifier if i use TIP35C and increase the supply to 70V what will be output power?

• seetharaman
October 30, 2014

around 68 watts into 8ohms load

• abraham
October 31, 2014

What about the sound quality sir still the same?

• arun darbari
March 4, 2017

sir we made 100 watt subwoofer circuit using 2n3773 but audio not found only humming sound found pl.help me as erly as possible we had ckack this properly

• October 11, 2014

Sir can you pls give me a diagram of bridge output transistorized amplifier.

• October 10, 2014

can u send photography of ur circuit….

• abraham
October 4, 2014

it is ok but can u pls give us circuit diagram for preamp

• seetharaman
October 7, 2014

You can use one of our sub woofer filters published in our earlier projects

• Prajyot
October 4, 2014

hello,
I have a pair of car Speaker with old magnetic car tape And also have a 12v power eliminator to connect at home but this is old fashion.

Now i want to make a circuit that connect to my mobile to play the music.
Using these sound and 12v power suppyer.

So please help me to make it working.
Also want to know what components should be required to make a circuit.

Please help me.

• Pascual
October 2, 2014

Sir can i use BC557 instead BC108?

• seetharaman
October 7, 2014

You can use BC546/BC547 or BC337

• Pascual
October 9, 2014

Thank you sir.

• markson 5.1 ch front displ pcb
September 11, 2014

Sir i need remore control 5.1 chanal with display .(clk.dat .5v .acb and ic 07bana005e3 i have caicuit but dont no correct ic no

• harith
August 14, 2014

sir..i made this circuit…i designed the PCB and buld it…but it works in best way for 3 mins and then lower the sound and produce a humming sound with varying bass sound… one 3773 transister is heating up… i cant understand why it is happening… can any one help me….

• anil babbar
September 29, 2014

please check Q5 & Q6 , and re-solder all the connections ( to rule out any dry solder- its a common problem with etched pcb)
also check the pcb it must be an etched pcb sometimes it is not able to carry the current the best way( for the hobbyist) is to solder a copper wire all along the pcb connections
finally the Q 7 is bound to heat up and iff u mount Q6 also on the same sink it will also get heated. USE A GOOD QUALITY HEAVY HEAT SINK OF NOT LESS THAN 8″ x 4″ WITH GOOD FINS

• harith
October 11, 2014

thanks..now it is working properly…nice..

• anil babbar
August 6, 2014

sir I want to add a filter circuit to this amplifier which requires a separate power supply of +12 / -12 VDC, can you give me a power supply circuit that can supply +/- 12 VDC and +/- 35 VDC from a single transformer
thanks

• Ateeq
July 18, 2014

my question is that i can not get the transistor 2n3773 because in the circuit diagram you have shown three legs of that transistor but in market it has only two legs.could you please tell me the substitution of that transistor or please guide me because i have to submit my final project in two weeks. please help me……….

• August 5, 2014

collector leg is metal case

• stj
July 7, 2014

Hi sir, I have tda7294 sub woofer, witch is the best sound quality, tda 7294 or your 100 wat trans..?

• Rateesh
June 30, 2014

Hi I assempled this circuit 2years before even now better work with 10″sub

• Riyaz
May 27, 2014

Sir how can i convert 12 -0 -12 suly to 25-0-25 with a transistor power suply please give me diagram

• john
May 5, 2014

hi sir which is the best for subwoofer amp. this circuit or 150 watt amp circuit.???? i want to make subwoofer amp.

• Seetharaman
May 6, 2014

150 watts amplifier with a good sub woofer filter will be best bet. Use latest updated circuit from the following site
(http://pcb.jspayne.com/150wattamp.html)

• john
May 8, 2014

thank you sir!

• May 2, 2014

Hello sir,can i use 12v input to the amplifier? if yes pliiz provide the circuit containing 12v input signal.
another request sir…please send me the dual 35+/35- power supply circuit of the amplifier.

• john
April 30, 2014

Hi sir! is this ckt need separate transformer? or can i use tip 142 and 147 150 watt ckt’s powersuply. if i connect like that, is this both amps output transistors will short?

• April 8, 2014

Any problem when can i connect 10inch 4ohm subwoofr on this circut. If no problem how much power will get?

• April 7, 2014

Can i use 25v 5amp ac to the circut?

• Seetharaman
April 7, 2014

Why this funny question? use supply voltage as recommended in the project. you can use a 25-0-25 5amps transformer with rectifiers smoothing capacitors and 6amp bridge rectifier (See 150 watts amplifier circuit for the power supply circuit). which will give you +35 -0- -35 volt DC for the amplifier.

• March 24, 2014

Hello, every one can i attach Q4 to Q7 in one heat sink and also give the perfect size of heat sink for this project thanks please reply I m waiting .

• abubakar
March 15, 2014

hello sir pls I have a question based on how to calculate the output power of this amp. U mention dat d relation of d output power is d square of voltage swing on d speaker leads divided by the impedence.pls sir I need explanations in detail. Thanks

• Chris
March 11, 2014

Hello,

I managed to build the circuit and on an ossciloscope the readings look correct but when i connect a speaker instead it shorts on the negative end of the circuit. Any idea how to fix this? Any help would be greatly appreciated!

• abubakar
February 11, 2014

pls sir I made another circuit of dis same amp n I don’t want to use these 2n3773 due to insulation issue, pls sir can u tell me any 3 pin transistor Wich will b as good as d 2n3773 ? I tried using 2sc5200 but d sound isn’t as good as d 2n3773.
n pls sir tell me d use of r1.tank u sir for ur time

• February 11, 2014

sir
want to be all all transistors please sent me i am all really getting transforms 35-0-35

• abubakar
February 8, 2014

thank u sir for d response my amp is working perfectly

• lcd950
February 2, 2014

Does this circuit work?
Did anyone make this circuit?

• babu
February 2, 2014

I have la4400 circuit what transformer it require for input power.
please specify me that are there any connection wire for bass in la4440 and i will connect 2 woofer speakers as 80w with 8″,let me know if I am wrong that at first i need a transformer to connect to la4440,where to connect the volume,bass connection.
here we have mac 8″ can i use.

what type of woofer I must use name please.

• babu
February 2, 2014

or give me a name of circuit to connect 8″ to 12 ” woofer.

• Seetharaman
February 3, 2014

This IC is a car amplifier chip to handle car battery voltage . you can use 13.2 volt DC. A 0-9 volt transformer rated for 2 amps is more than sufficient. use a 3amp bridge rectifier and 4700uF 25 volt filter capacitor in parallel with 0.1uf 25volt ceramic disc capacitor. The IC will give 4.5 watt rms output into 4 ohms speaker.

• prudhvi
February 24, 2017

So what is the rms output for this 100 watt circuit?

• January 30, 2014

Direkt auf. Es ist mehr informativ und leicht zu verstehen. Vielen Dank so eine schöne Leitlinie ……

pa verstärker

pa endstufe

Mehrzonenendstufen

• Seetharaman
January 31, 2014

english please for a reply.

• abubakar
January 28, 2014

hi every 1 pls I have a question..pls I have a 2ohms 50watt subwoofer speaker can I use it wit dis amp

• Seetharaman
January 31, 2014

Hi Abubakar No. It will blow the output transistors. Minimum speaker impedance is 4 ohms for this circuit.

• abubakar
January 27, 2014

thank u sir seetharaman for d wonderful post n I thank u all for all ur comments. through d comments I was nw able to build my amp n it works really great. Thanks every 1 once again .i have nw started building d 150watt amp.sir may god reward u for all ur efforts

• rohin
January 25, 2014

hi, for pcb of this amp read my comment (rohin).

• abubakar
January 18, 2014

hi every one I have problem building dis circuit can someone help me out?pls

• January 17, 2014

Pls can someone guide me on building dis circuit? I only have a humming sound @ d output.Whr must I have gone wrong?

• harith
January 16, 2014

sir please…im waiting for ur reply….pls any one….help….

• alexander
January 14, 2014

Hi i like this circuit,please give and send me a printed circuit board for this project.

• Kannan
January 7, 2014

how to noise produce to this ic

• harith
January 4, 2014

seetharaman sir,
im an university student from Sri Lanka.im interested in this circuit….im going to build it.i have 28-0-28 transformer.can i use it? im going to use 4ohms 10inchs 200W subwoofer speaker.is there a chance to having a PCB desing of this cicuit..pls help…thanks.

• saravanan
December 29, 2013

please i want to know the full spare list and pcb layout

• IH55T
December 20, 2013

This amp works great. I was unable to find a 2N5494, but searching through the replies from the author identified similar replacements. The only problem I’m having is the presence of 0.177v at the output with no input. I’ll do a little adjusting on the bench to move the crossover point. Regardless, this works as published.

• November 24, 2013

my mobil no 9843946968

• November 24, 2013

want to all spears

• BAB
December 4, 2017

i want pcb of this amplifier

• krishna
September 25, 2013

Hai sir, SEETHARAMAN. Does this amp needs preamplifier to amplify below 140htz signals or jst audio output any source will do, can u plz send me the circuit PCB,thanx for the reply.

• Seetharaman
January 19, 2014

You can connect the input to 5.1 filters sub woofer output.

• September 19, 2013

seetharaman sir plase help with me my mail id gsgunasiva077@gmail.com

• September 19, 2013

all spears data sheet and transister 3 how can test telme my mobil no 09843946968

• September 19, 2013

please all spears list (35+)+(-35):70dc given onely for this project give me one sample assambled pdf or photo

• September 10, 2013

i need information on electronics

• sravan
August 15, 2013

how to add a volume controller to the circuit
please please send me the circuit diagram to my email id please sir please,,,,,,,

• RAVI
August 7, 2013

CIRCUIT FOR 7.1 CHANNEL AUDIO. FOR 2 CHANNEL INPUT.
ABOUT 300-400 WATT SUB WOOFER,& 50-100 WATT SPEAKERS.
SIMPLE CIRCUIT FOR IT.
PLEASE REPLY ME.

• siva.R
September 14, 2013

CIRCUIT FOR 7.1 CHANNEL AUDIO. FOR 2 CHANNEL INPUT.
ABOUT 300-400 WATT SUB WOOFER,& 50-100 WATT SPEAKERS.
SIMPLE CIRCUIT FOR IT.
PLEASE REPLY ME.

• Kwadwo Boateng
August 7, 2013

Sir, after building the 100w subwoofer power amplifier how will it look like. Thanks

• August 4, 2013

hello sir, i want 5.1 home theater circuit digram pleas

• omer
July 16, 2013

150 watts subwoofer amplifier circuit added here
visit
www . it-tronics . blogspot . com

• Guna
June 26, 2013

Transister how cane checked .? Bass callactor emater and npn pnpn

• Guna
June 26, 2013

Yoused for 35-0-35 volt transformer dc circuit diode and capacitor witche valvu yoused an this circuit

• cooool
June 25, 2013

hi sir I made this circuit on breadboard only speaker humming there is no output sir please help me sir my circuit is till on table

• Guna
June 24, 2013

100w amplifier connected load 8″ speaker how much sound came ? Input volt 35 -0-35vdc 5amps

• Seetharaman
June 25, 2013

Hi Guna with 35 – 0 – 35 volts DC you will get 60 Watts RMS output power into 8 ohms speaker .

• December 16, 2013

please give me your nambur

• arun darbari
March 4, 2017

we made subwoofer amp.using 2n3773 as per your circuit diagrame but audio was not fond on today we ckack properly can you halp me we will thankfull for that

• Guna
June 17, 2013

680 ohm how? watt

• Seetharaman
June 20, 2013

Hi Guna Normally all non indicated resistances are 1/4 Watt 5% tolerance type.

• Guna
June 17, 2013

47 k is how ? Watt

• Guna
June 17, 2013

100w amp traied this projact please help all capacitor valvu 100v reastor valvu some miss ing

• Harry Cat
June 8, 2013

I have a question about the required power supply for this amp circuit..
I currently have a 36-0-36 5 amp per side transformer that will deliver +-35 volts DC after going through the 5 amp bridge rectifier. I also have one each per side 4700MFD 63 volt Electrolytic Cap and one 2.2MFD 60volt Poly Cap per side..
Is this power supply setup too much for the circuit to handle or do I need to by a 25-0-25 transformer to keep from over loading the circuit?
A 25-0-25 transformer that delivers 5 amps per side is extremely expensive..
I could build my own transformer but getting the E I type silicon Iron sheets is impossible since I live in America. America doesn’t make anything or have anything to make a transformer except magnet wire only.
Thanks

• Harry Cat
January 20, 2017

I got it to work myself. I rewound the secondary on the transformer twice. Once at 25-0-25 which didn’t work very good and then again at 34-0-34 which worked fantastic. The only problem that I’m having is, is with the preamp stage where the audio is being distorted. But neither the less, I have it working and it doesn’t sound to bad. I have it posted on my Facebook page. I had to tweak the hell out of the crossover to make it sound halfway descent.

• Harry Cat
January 20, 2017

I think that problem with the preamp stage is, is the C2 polarity is wrong. I noticed when I have the volume way down, it sounds perfect but when I crack up the volume it becomes distorted. It would be nice for someone to let me know something.

• normal
June 6, 2013

Hi sir I transistor 2n5294 and only 5294 are same? Please reply me

• normal
June 6, 2013

Hi sir I transistor 2n5254 and only 5294 are same? Please reply me

• vitthal
May 31, 2013

Hi Sir,
please sir,
Can you please send me a simple home theatre circuit using Subwoofer. with material list

• Janaka
May 25, 2013

Hi Sir,
This one has no Filter circuit. Right.? So if we connect this to any input other than SUBWOOFER OUT PUT of a Hi FI set up we should have a filter circuit connected to this first. Right sir.?
Forgive my Ignorance. How do I determine the BCE pins of Transistors. I know how to figure out BCE of C828 and D400 transistors but is it the same for these Transistors too.?. All Transistors have the BCE pins in the same way or are they different depending on PNP or NPN. Please explain..Sir..

• Seetharaman
May 26, 2013

Hi Janaka if you have a subwoofer output from your dvd player, can be connected directly to this amplifier. If you have only stereo information(left and right channel information) then you have connect through a sub woofer filter bothe channel information to make it as 2.1 information. 2 is left and right .1 is subwoofer signal.
Transistor lead configuration will differ for each manufacturer, hence you have to consult their catalog. the following link is the best filter
http://sound.westhost.com/project48.htm

• ASHISH KUMAR
May 20, 2013

HI,
SIR,
KINDLY SEND ME A CIRCUIT OF 200 WATT RMS SUB-WOOFER AMPLIFIER, ITS OPERATING CURRENT AND VOLTAGE, PART LIST AND PCB.

• ajithsoman
May 15, 2013

its working..well..

• Janaka
April 23, 2013

Sir, Forgive my Ignorance. How do I determine the BCE pins of Transistors. I know how to figure out BCE of C828 and D400 transistors but is it the same for these Transistors too.?. All Transistors have the BCE pins in the same way or are they different depending on PNP or NPN. Please explain..Sir..

• Janaka
April 23, 2013

Hi Sir,
This one has no Filter circuit. Right.? So if we connect this to any input other than SUBWOOFER OUT PUT of a Hi FI set up we should have a filter circuit connected to this first. Right sir.?

• SUBRATA KARMAKAR
April 20, 2013

Can you please send me a simple 2.1 home theatre circuit using Subwoofer.

• Bipro
April 15, 2013

pleas give me the pcb of this circut.

• LOGANATHAN G
February 27, 2013

hi sir
can you please give me the PCB layout of this circuit..

• Janaka
February 25, 2013

Please let me know this 100 watts are PMPO or RMS???

• Seetharaman
March 30, 2013

Hi Janaka it is 100Watts RMS power at <1% distortion into 4 ohms load with plus minus 32 volts DC and into 8 ohms load with plus minus 45volts DC supply.

• rohin
February 24, 2013

hi, for pcb of this beautiful amplifier visit at my blog http://www.123456789wertt.blogspot.in/

• vicky
March 19, 2013

thanks for pcb…did u check that ckt by giving connections>>>>?

• rohin
March 24, 2013

hi vicky, i made 6 amp on this pcb.pcb is working 100%.alternative list of transistor.bc 108 or bc 109 or bc 547 and 2n 6107 or a940 and 2n5296 or 2n 5294 or c2073.2n3773 or 2n3055 or c 5200 or mjl 21194.

• Alfian
March 25, 2013

Hi….. Rohin
how to add volume control in this subwoofer…?

• rohin
March 26, 2013

hi, you can use any tone control circuit.for a subwoofer you need sub filter circuit otherwise you can add a tone to control volume that is your taste.

• Seetharaman
March 30, 2013

August 9, 2011 at 8:36 am
Hi Shbham Use a 100k log potentio-meter(three tags), preferred but if not available use 100k lin (not rheostat- 2 tags only). connect center of the potentiometer to C1. one end of the potentiometer to common(ground). Connect input between both the end of the potentiometer such that input signal ref is connected to common and actual signal is connected to other end of the potentiometer.

• Petar
February 17, 2013

Hey there im a student at chisholm catholic college and am working on an engineering project.Just wondering if you have a diagram of a circuit for a 100 Watt sub woofer amplifier that can run off 12 volts.

• Lonely Eagle ..
January 24, 2013

Sir can i get your pcb lay-out !? So that i can build it at my own ..

• RHOL
January 19, 2013

sir, can i have the design of pcb layout…thanks!!!

• Ch.shashank
January 16, 2013

sir i want to design this ckt please if u have some time please send me your pcb layout sir please i want to try it for my project sir…….

• Brainz
February 5, 2013

Has anyone emailed you the PCB?

• safder
January 13, 2013

hi sir
can you please give me the PCB layout of this circuit..

• December 30, 2012

Sir i am used for 100 watts subwoofer . Which capacitor use?

• srinivasan
December 24, 2012

dear sir,

i am using this amplifier for my sub-woofer with KFC W3013 ken wood 12″ Woofer(1200 W peak 450 W RMS) , and i am using sub-woofer filter also i/p of this amplifier , 24-0-24 5A Ac transformer,but when i raise the volume,i am getting poor effect( like vibration DURRRRRR – sorry i don’t know how to explain)with base effect ,i could not understand, what is the real problem , woofer also more than enough wattage rated with proper size enclosure ,transformer 5A rating . any body can please advice me .

thanks in advance

• May 9, 2013

Hi, please check the grounding.power supply grounding ,volume control grounding and speaker ground should be connected to different ground points. volume gnd should be away from power supply gnd point .

• gayan
December 10, 2012

can u please send me the list of components by a mail please .

• ermsk8er
December 5, 2012

Thanks!

• ermsk8er
December 4, 2012

Thanks for sharing your design, sir. Can u send me ur pcb layout for this circuit. Thanks again! My email – erm.sk8er@yahoo.com

• December 4, 2012

dear sir..

i want to try your 100wat subwoofer as my project in school.. can u sent it to me ur PCB layout and so with the components… thanks in advance..

• November 22, 2012

Dear Sir,
Please send me the parts details of this circuit board & thanks for the idea.

Thanks & Regards,
Rahul Cina
Data Processor of Godrej & Boyce Mfg. Co. Ltd.

• manish
November 16, 2012

hiii can u plzz tell me whats d difference between a subwoofer amplifier and a normal 150 WATT amplifier…..
can anyone plzz explain….
plzz hlp..me i m making d 150 WATT amplifier

• Janaka
April 23, 2013

Sub woofer is a Mono Amp giving only the Bass ( Mostly) to a one Speaker. A Normal Stereo Amp is giving both Bass and treble to two Speakers. In a Sub woofer A Filter circuit also used to filter the sound so Treble can be minimized giving only the Bass. but again in a Normal Stereo Amplifier Filtering is not required. It gives both Bass and Treble equally.

• manish
November 16, 2012

Hi can anyone plz temme is ther any difference between a subwoofer amplifier and a normal amplifier I am going to build the 150watt amplifier how can I interface a subwoofer??? Plzzzz hlp me
Thanks in advance……

• S.alam
November 6, 2012

hi
can anyone please give me the PCB layout of this circuit
“alamisdecent@gmail.com”

thanking you..

• omer
October 22, 2012

hi sir seetharaman….

i have a question in my mind that is dre any way to increase the output power of this amplifier?

here’s one thing in my mind that if i use multiple transistors (2n3773’s) at the ouptput then is there any chance of increment of the output of this amplifier???????

if yes then what will b the supply ratings??
n how much i can increase the power by doing this modification ?

• Kennedy Marquez
October 4, 2012

Thanks for the circuit. Sir I want to do it. can you please help me, just send to my email the full detailed of the circuit including the part lists(also the electronic components connection), the speaker and the power supply that I will going to used. thank you very much sir.

• rohin
October 6, 2012

hi everyone,those who want to get pcb layout of this circuit plz tell me on my email id rohitkumar962@yahoo.com.i will give you all detail related to this topic.thank you and love you.

• October 12, 2012

Do you really have the PCB for this circuit????
if yes plz mail me on my mail id

• rohin
October 14, 2012

what is your email adress, send me on my email id.

• tabish baqri
November 18, 2012

sir pls pcb layout send my id

• Guna
June 18, 2013

Want to be 100watts sub circuit parts

• joy
October 21, 2012

Am interested this ckt please give the pcb lay out

• tabish baqri
November 9, 2012

i want to know about pcb

• pradipta pal
September 26, 2012

i want to do a 5.2 channel surrounding home theater without programmer i.c. I want to know a circuit design using tl 084. But the i.c is not available where i live. Plz anybody give substitiude i.c design.

• rohin
October 4, 2012

hi pradipta pal,you can use lm324 in place of tl084 without any tension and it is available all electronics shops.best of luck

• YED KRiz
September 22, 2012

SEETHARAMAN sir tank u for this circuit…..
sir can u please mail me the pcb layout of this circuit….

SEETHARAMAN Sir,AS A FEED BACK,CAN YOU ATTACH THE PCB LAYOUT OF THIS CIRCUIT.BECAUSE EVERY ONE HAS DIFFICULTY TO FIND THE PROPER PCB LAYOUT OF THIS CIRCUT.IF YOU DO THIS,IT WILL BE A VERY HELP FULL FOR PEOPLE LIKE US

• rohin
October 3, 2012

HI YED KRIZ,don’t take tension about the pcb.i will make for you on 7th oct. on sunday.i will make it without power supply capactor and diodes.i want to help you all new people in electronics. seetharaman sir is great and they are doing a nice job for us.thank you n love u all

• prakash
September 19, 2012

Hi… can we use torroidal transformer…?

• prakash
September 19, 2012

Hi… plz provide the transformer specification and as well as recommended power supply circuit to the amplifier.

• seetharaman
September 20, 2012

September 9, 2012 at 9:43 am
Hi Pramod you cannot, as 36-0-36 AC at transformer secondary will produce a DC of +51 – 0 – -51 volts. it will blow all the components. The maximum allowable transformer secondary rating is 25-0-25 volt RMS AC @3Amps, will develop around +36 -0- -36 volts DC best suited for this amplifier.

• rohin
September 22, 2012

hi everyone,transformer for this circuit is 26-0-26 ac.it gives 40-0-40 dc.for example ac i volt when we convert it to dc it become 1.4142volt dc.

• Gaurang
October 2, 2012

hello dude…….frm ac to dc. dc is decreased……or say less valued then ac…..

• rohin
October 16, 2012

go to school again

• sai ram
September 17, 2012

sir please replay me fast sir i am waiting for u replay

• sai ram
September 17, 2012

sir i have center transformer which has teo outputs the outputs goes lie this 24-0-24 12-0 5amps can i use this transformer in this circuit bcoz 24+12=36v

• omer
September 14, 2012

for a complete PCB layout of this amplifier circuit just mail me …

• PRAMOD MANUJA
September 14, 2012

THANKS SIR I GOT A BIG KNOWLEDGE FROM THIS CIRCUIT& I BUILT IT. IT IS WORKING.THANKS AGAIN ! I USED B857 FOR 2N6107,D313 FOR 2N5294.

• omer
September 12, 2012

hey guys, if any one is new to electronics and want to build or design his/her own sound systems then please visit my blog.
containing all step by step instructions for building any kind of amplifier. I have started it from the very basic.

http://www.universalcircuits.blogspot.com

i have started this platform for all people who find their great interest in making their own circuits.

• PRAMOD MANUJA
September 8, 2012

SIR CAN I USE +36V / 0V / -36V 5A TRANSFORMER ?

• seetharaman
September 9, 2012

Hi Pramod you cannot, as 36-0-36 AC at transformer secondary will produce a DC of +51 – 0 – -51 volts. it will blow all the components. The maximum allowable transformer secondary rating is 25-0-25 volt RMS AC, will devolop around +36 -0- -36 volts DC best suited for this amplifier.

• omer
September 8, 2012

hey guys, if any one is new to electronics and want to build or design his/her own sound systems then please visit my blog.
containing all step by step instructions for building any kind of amplifier. I have started it from the very basic.

http://www.all-audio-amplifiers.blogspot.com

i have started this platform for all people who find their great interest in making their own circuits.

• mahesh
September 7, 2012

hi Seetharaman sir , i have 12 -0 -12 tx & give me the pcb design ckt of 60W Subwoofer. Thanx

• PRAMOD MANUJA
September 4, 2012

sir please send me replacement for all of this transisters.if i use this replacement do i have to change transformer or any other part ?

• September 4, 2012

I need a circuit diagram of a 100watt audio amplifier with four B688 and four D718 transistor

• Suresh
August 24, 2012

Any one can sent me the pcb design plz?
This is my email.:Sures1997@gmail.com

• August 15, 2012

I never use before,i am now going to try.

• sai ram
August 11, 2012

sir this subwoffer gives only subwoofer effect what abt left and right speaker how to connect it in this circuit

• Seetharaman
August 19, 2012

Hi Sairam Sub woofer is the the one which reproduces below 140Hz. This cannot be heard but can be felt by body hence no directivity. One amplifier with suitable low pass filter getting the signal from both left and right channel information with a sub woofer box will take care of it. For left and right speakers you require a stereo amplifier to amplify left and right signal seperately and reproduce, which will give you the directivity.

• Seetharaman
August 6, 2012

Hi Predencio you can use.

• Prudencio G. Peritos Jr.
August 3, 2012

sir
can i used 24v-0-24v 6A for this circuit?

• Prudencio G. Peritos Jr.
August 3, 2012

hello sir can i used 24-0-24v 6A for this 100 watt subwoofer amplifier?

• ishan1211
July 26, 2012

Sir,
I am waiting for your answer, my circuit is still on the table. Pls reply

• Punam Pradhan
July 25, 2012

I have all the required Parts for the 100 watt sub woofer amps. but without PCB I am little confused.If any one can send me PCB design will be great help for me.

Thanks,

Punam Pradhan

• ishan1211
August 5, 2012

Send me your email

• rohin
July 23, 2012

hi dear seetharaman sir , this amp is good and its still working without any probelm. miss you and love you. you are one of the favorite person in my list.

• krishna
July 23, 2012

sir,
Can u send me a circuit for 60w subwoofer circut

• ishan1211
July 11, 2012

Sir,
I made this circuit but power both transistor 3773 heatup withing few seconds, speaker is humming without a signal, voltage between speaker about 10V. sir what would be the solutions?

• ishan1211
July 9, 2012

Sir,
My transformer provide 35v, 0v, 35v. so how can i create +35v , -35v ?

• ishan1211
July 26, 2012

solved

• sebin jacob
June 27, 2012

Seetharaman sir,

I am using this amplifier for the last one year.It is working fine and i am satisfied.You helped and guided me a lot during this project.Hope you r doing good.Always remembering your help.

SEBIN JACOB

• NASA
June 20, 2012

hellow sir
i want to made a simple circuit with woffer and spekar so how..??? give me daigram pls….. its my project nd by net i get a circuit but its very complicated so…..

• Pankaj
June 17, 2012

hello sir please tell me how can I add a bass and volume controller to this circuit?????

• Pankaj
June 17, 2012

thanks a lot sir now I had made the changes and my circuit is working perfectly……
thanks again for your support and feedback.

• Seetharaman
June 16, 2012

Hi Pankaj you have to use 2N5294 only. since 2N5296 VCEO is only 40 volts. With DC + – 28 volts the circuit should work but will give you lesser wattage. With 18 volt transformer you will get only + – 25volts. try to use recomended components or else the circuit may not give satisfactory results. The component values are calculated for a particular supply voltage a deviation of a maximum of 10% only allowed.

• Pankaj
June 15, 2012

sir please help me my circuit is not working….

• kanagaraj.s BE
June 12, 2012

sir i want 24v single supply power amplifier circuit(nearly 30v) equivalent
to stk 4392 plz send me

• Pankaj
June 11, 2012

thanks a lot sir but in my location there is no such person.
is it possible that it is due to my power supply because Iam using +/-28 volt power supply?????
In the power supply Iam using 18-0-18 volt 5 amp transformer.
and sir Iam not able to find 2N5294 so Iam using 2N5296 is it possible that the problem is due to that transistor??????

• Seetharaman
June 10, 2012

Hi Pankaj check all your wirings transistor pins and diode polarities value of resistances capacitor polarities etc. Still if you are not in a position to fix the problem and if you are new to building of high power audio projects, please approach any knowledgeable electronic hardware engineer nearer to you, by physically viewing and analysing your assembly.

• Pankaj
June 9, 2012

Sir My circuit is not properly.Iam using a +/-28 volt 5A power supply.But my speaker is only humming doesnt produce any sound and the transformer starts burning after few seconds.Please suggest me appropriate solution…..

• SYED OMAR MASOOD
June 8, 2012

circuit diagram of ups 500w

• SYED OMAR MASOOD
June 8, 2012

I want a complete ups circuit diagram and also a line follower robot circuit diagra…

• Pankaj
June 3, 2012

hello sir could you please give me the board layout of this amp. Because I,am new to electronics field and not able to make a proper board layout.Please help me
my email:-pankaj2892@gmail.com
Thanks

• May 18, 2012

Inverter circuit diagram output 220w

• jocel
May 3, 2012

hai sir, my hobby is electronics all my knowledge came from my own interest and patience i didnt go to school. im studying electronics on my own. and its hard. so please help me sir.
may i ask you the formula of this amplifier and i will study it and give tips in designing audio amplifier.. thank you sir and God bless u all my fren… this is my email: http://www.jeoceltangdol@yahoo.com

• seetharaman
April 15, 2012

Hi Srinivasan you can connect it only through bass boost amplifier low pass filter is not required.

• P.Srinivasan
April 15, 2012

Hi seetharaman sir , i am using our low-pass-filter-for-sub woofer before this circuit ( for direct audio out ). can i add base booster pre amplifier with lowpass filter ,
if i can , where i can connect low pass filter input or output stage ?

• bal wolley
April 14, 2012

I am building an infrasound device to be used in a spook house for a chairity fund raiser and need to build an amplifier that will not filter out the signals below 22hz. How do I configure this amplifier circuit to do this?

• seetharaman
April 14, 2012

Hi Srinivasan The recorded MP3 CDs are compressed ones they will produce only a flat response(but for the few genuine good quality recording). You can add a bass boost pre amplifier before feeding it to this amp. In the net you get plenty of such bass booster schematics use on of them.

• P.Srinivasan
April 14, 2012

Hi seetharaman sir, when i using orginal dvd or audio cd , i am getting good base effect form this amplifier , but when i using mp3 cd’s i could not get same effect even half also , what is the reason ??? what can i do for that ?

• Seetharaman
April 4, 2012

Hi Sujeesh use our subwoofer filter.
http://www.circuitstoday.com/low-pass-filter-for-subwoofer

• Sujeesh
April 4, 2012

Hello sir,i want a tone controll seprator circuit that allows low freequency into this power amp’s input filter and other tones are seprate for other audio amp.please help me sir,
my mail id is sujeejackson@gmail.com

• techera
April 2, 2012

wonderful

• dav
April 2, 2012

interesting.

• Ajith
March 25, 2012

sir..what type of heat sink the ,main transistor need…can i get an image of assembled this circuit..
ajithsmn@gmail.com

• shyam singh
March 24, 2012

can i get the pcb lawout

• seetharaman
March 12, 2012

Hi Srinivas the relation for the output power is square of the voltage swing available across the speaker leads divided by the impedance of the speaker.
The budget cost including power supply, with standard trasformer, good heat sink, PCB and with good quality low noise components will be around INR1200/-

• P.Srinivasan
March 12, 2012

Dear seetharaman sir,

if input voltage is decrease below 30-0-30 then out put RMS power will decrease ????

• March 11, 2012

sir wats the budget cost of this circuit

• Ajith
March 10, 2012

sir,i too think so..but i use a cooling fan also with it…does it can compansate it…??

• Seetharaman
March 10, 2012

Hi Ajith it should not become too hot it looks like your heat sink is insufficient, try using a bigger extruded alloy heat sink.

• Ajith
March 10, 2012

sir.,now my amp works fine..but .when it works for almost half an hour ,the 3773 s get hot as much as ,cant to touch it…
Is it a problem or its usual??pls help me. .sir.,

• rohin
March 6, 2012

hi to everyone, i want to tell you that for good quality sound and high bass 2n 3773 is responsible. it made by many company like bel,toshiba,motorolla,china and local in delhi. you will get bad low quality in local and china made transistor of cost of 5 Rs. rest are cost of estimatly 50 Rs. so purchase right one for circuit.

• Seetharaman
March 6, 2012

Hi Harshit use our 150 watts amplifier with suitable sub woofer filter
http://www.circuitstoday.com/150-watt-amplifier-circuit

• ishan1211
March 6, 2012

Sir,
I have bought every equipment’s in this circuit. my next challenge is design PCB diagram. it’s not very easy for me. if you can send me PCB diagram. Thanks
E-mail: ishan1211@gmail.com

• P.Srinivasan
March 6, 2012

Dear Mr. seetharaman , can u please give me two channel switching circuit using audio signal detection that means one line normal condition , if 2nd channel audio signal detected 2 channel to be active and first channel to be disconnected.

• harshit
March 5, 2012

sir i want to make a subwoofer for computer please send send me a circuit of 150watt which is not so costly

• rohin
March 4, 2012

hi to everyone, i love this website and dear mr. seetharaman. this is not only a place where we make these projects and discuss. how we love each, to each other and respect. i am very empressed by you all and specially mr seetharaman. now i will give you, all my experience.May God bless you all.best wishes for holi.

• March 4, 2012

my mail id nvnkmr3128@gmail.com

• March 4, 2012

friends…i have a stereo amplifier..i would like to set a sub woofer to that amp..i got a sub board and i connected it…but the beat is very low..may i give the output of sub board to stk 4141 board and amplify it…my power supply is 12 0 12 3A transformer…is it enough..or any other reasons????

• ALAM
March 4, 2012

i have two speakers (max 70 watt, 6ohm)both
i need a sub woofer amplifier design
suggest me a design that produce heart pumping sound my mail is
((( alamisdecent@gmail.com )))

• Ajith
March 4, 2012

sir..can i??

• Seetharaman
March 4, 2012

Hi Alam Both are very important. a good amplifier with lousy speaker or a distorted low power amplifier with very good speaker is of no use. A rigid sealed enclosure is a must. the speaker can be little less rated than the amplifier for the best performance. A 100 watts @ <1% distortion amplifier with say 80watts 12" speaker or 40watts 2 nos 8" speakers in rigid sealed enclosure can give high quality thumping bass.

• ajay
March 4, 2012

hey rohin
thanks a lot for ur time and advice .

• Ajith
March 4, 2012

thanks seetharam sir…i got ur mail.
Sir.have a ups transformer with rating 6-0-6 />20amps[500va].can i use this transformer to obtain 25-0-25 /5A.,.

• rohin
March 3, 2012

yes, ajay my brother i am here to help you. i want to chat with you . i quicky solve your probelm . my no. is 9855427506. it is difficult to solve this by comments

• alam
March 3, 2012

can any one tell me that who is responsible for the high bass effect
1 amplifier or
2 speakers

• ajay
March 3, 2012

hey rohin
can u help me with the circuit I have almost built it twice but still its not working.I have checked the transistor they are connected in right way .I have used c3 6.8uF 63v instead 0f 10uF and transistors bc547 instead of bc108. is it because of the bc547??? all my capacitors are rated above 100v except c3.

• ajith
March 2, 2012

sir..my e mail id is..
ajithsmn@gmail.com
thanks.

• Seetharaman
March 2, 2012

Ajith send your email id i will give ou a detailed checklist

• ajith
March 2, 2012

sir..i made this circuit..but its does not give any outputs..
When i connected to supply both 3773 get heats up within seconds..how can i test the circuit…..sir,what may be the problem?pls help me…i made this circuit for my mini project at my clg…..

• P.Srinivasan
March 2, 2012

thanks for your confirmation

• Seetharaman
March 2, 2012

HI SRINIVAS HE IS CORRECT THE SAME I HAVE MENTIONED MUCH EARLIER ALSO.

• P.Srinivasan
March 1, 2012

Dear Mr. seetharaman , as on rohin comment C2 polarity is wrongly connected
, its true ??

• rohin
March 1, 2012

TO making this circuit, you should know about the E C B of every transistor.if you conected it wrong then circuit will not work at all.2n 6107 and 2n 5294 , keep them front of your eyes( black side of the transistor , where is no. showing) left pin is base , middel pin is collector and the third pin is emitter.In 2n 3773 , keep it pin sides in front of your eyes and you will find that pins are much closer to one hole than comparesion to other hole , keep that hole to left which is much closer to pins and then upper pin is emitter and below pin is base and case is collector. you can use 5296 or 5294 or 2073.you can use bc108 or bc 109.check proper wiring it should be same as diagram showing.if everthing is ok. you should check your all transistor . you can check bc108 by multimeter hfe ports and its C B E too. for npn transistor, put postive on base and negetive to emitter, it showing 600or 700 ohm resistance like diode and negetive to collector it showing same as emitter but when negetive on base resistance should be high for both emiiter and collector. and to check pnp , it same like the npn only difference of postive and negetive leads

• rohin
March 1, 2012

hi to everyone, i want to tell you all that amplifier works fine and this circuit is high bass than 5.1 home theater. i already built it with the help of dear mr. seetharaman. he is a great person.there is one mistake in this circuit that c2 polarty is wrong conected. so kindly change it . otherwise there is everything allright. while making this circuit i face some probelm and i want to share it with you all.

• manigandan
February 29, 2012

i want circuit

• seetharaman
February 28, 2012

Hi Ajith a subwoofer amplifier is an amplifier with a good low frequency response and with a power of not less than 40Watts RMS at less than 1% THD & with good transient response.

• ajay
February 27, 2012

hey
can anyone help me with this circuit please…. i have built this circuit but its not working .all my capacitors are rated above 100v except c3 which is 63v.used 2n5296 instead of 2n5294. c1 is 0.47mfd instead of 0.22mfd tested it with a 24-0-24 supply.Rest all are same components. what should I check in the circuit..

• faishal
February 27, 2012

sir tolong kirim ke email saya pcb layoutnya.trims

• Ajith
February 26, 2012

sir ,what is the difference between an ordinary amplifier and amplifier designed for subwoofers??

• Awn Abbas
February 26, 2012

Hi Sir seetharaman i want pcb design of this 100w sub woofer amp PLz Send me On my ID Plz Plz Plz

• Seetharaman
February 25, 2012

Hi srinivasan if output voltage is positive with respect to common zero reduce either R11 or 12 to next lower preferred value. if negative increase it to next higher preferred value

• P.Srinivasan
February 25, 2012

how to adjust the R11 or 12 value , value to be increase or decrease

• regor wall
February 25, 2012

gud day sir seetharaman ..! i want to build your featured subwoofer amp..can i ask for the pcb layout of this amplifier..pls email me..Wall.regor@yahoo.com.

thanks in advance sir.. your reply is highly appreciated..

• seetharaman
February 24, 2012

Hi Srinivasan check the DC voltage across speaker. It should be zero. if not one may draw more current than the other. you may adjust the value of R11 or 12 till it becomes minimum, the problem is due to mismatch in the components.

• P.Srinivasan
February 24, 2012

hi seetharaman sir this amplifier working fine , but output one transistor heating more than other transistor . i am using 30-0-30 v Dc 5A

• Shivam Vats
May 16, 2015

Sir
Can you please give the circuit diagram of a +35V/-35V, 5A dual power supply to power the
100W-sub-woofer amplifire.

Thank you
Shivam Vats

• rohin
February 23, 2012

hi seetharaman sir, you are great and i thanks to you very much for help me. now my circuit is working fine.

• r.vijay dhas
February 23, 2012

i want pcb design of this 100w sub woofer amp my id r.vijayadhas@gmail.com

• Seetharaman
February 22, 2012

Hi Rohin check your email for my detailed reply.

• chandu
January 30, 2017

hi, sir i have 150 watt, 8ohm, subwoofer ,its support to 4.1 home theatre audio board ???? once its can’t supprt then wich type of audio board i can use plzz tell me sit

• rohin
February 21, 2012

circuit is not working for me

• rohin
February 18, 2012

i am wiating your help and response

• rohin
February 17, 2012

my mail id is rohin.sharma83@yahoo.com some one help me

• rohin
February 17, 2012

dear sir,i made this circuit but not working when i connect it to woofer R15 is burning please help me as soon as.waiting for your reaply

• January 30, 2012

response

• J S Nagaraj
January 30, 2012

Please confirm me wether this blog is genuine or wether this website is a fake

• P.Srinivasan
January 30, 2012

Dear sir , i planned to keep the this amplifier kit ( including power supply unit ) into the sub woofer enclosure inside, there is any problem if woofer and transformer in one box ,

SUB BOX DIMENSIONS KFC-W3013
Sealed box volume 35.4 Litres
Sealed Box Dimensions 475 x 362 x 299mm (19mm thick MDF)(WxHxD)
Vented box volume 56.6 Litres
Vented Box Dimensions 590 x 362 x 355mm (19mm thick MDF)(WxHxD)
Port dimensions (labyrinth) (W x H x L) 38 x 324 x 546mm

please advise me

• J S Nagaraj
January 30, 2012

Mr. Srinivasan, there won’t be any considerable problem because most of the
2.1 channel amplifiers contain transformers in them but try to keep a bit far from the speaker.Try to shield the transformer if not leave it as it is.

• J S Nagaraj
January 30, 2012

Sir, Mr.Seetharaman
I am not finding an exact input buffer and tone-control circuit for
my STK4141 II amplifier board. Please help me with TOTAL amplifier circuit of the same.
Thanking you,
J S Nagaraj.