100 Watt sub woofer amplifier.

john January 21, 2014 785 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.
100-w-subwoofer-amplifier-circuit

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
  • 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.

  • 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.

  • 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!

  • June 3, 2015

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

  • 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 ?????????

  • 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.

  • 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?

  • 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……….

  • 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.

  • 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.

  • 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

  • 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 …

    shining_star_12351@yahoo.com
    or
    engr.omer19@gmail.com

  • 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.

  • 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.

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