In this project, let’s learn about a simple Stereo Amplifier Circuit. This simple circuit is designed using 4 class B audio amplifier IC’s from Philips – namely TDA1554. Amplifier circuits are usually a pain to design, as you’ve to factor many elements into consideration.

The Design of Stereo Amplifier Circuit

Here is the circuit diagram of a  powerful and high-quality stereo amplifier using IC TDA 1554. The circuit has only very few components. The circuit works best with a 4 Ohm speaker.

TDA1554 is a 4 x 11 watt integrated Class-B audio amplifier from Phillips. Since the IC can be operated from 12V it finds a lot of applications in-car audio systems. The TDA1554 has a lot of good features like thermal protection, reverse polarity protection, load dump protection, short circuit to ground protection, excellent ripple rejection, no switch ON/OFF thud, etc. The IC can be wired in single-ended or BTL (Bridge Tied Load) configuration and here in this circuit the later is used.


IC must be connected to a heat sink. A  computer cabinet fan can also be used in addition(not necessary). Any way better the cooling better the performance. The circuit roughly draws 5A current at 12 V at full volume. So the power supply must be anything more than 5A. Up to 18 V can be used, which gives a bit more power boost. Commonly used is 12 V.

Parts List

R1              39K 1/4 Watt Resistor
C1,C2        10uf 25V Electrolytic Capacitor
C3              100uf 25V Electrolytic Capacitor
C4              47uf 25V Electrolytic Capacitor
C5              0.1uf 25V Ceramic Capacitor
C6              2200uf 25V Electrolytic Capacitor
U1             TDA1554 Two-Channel Audio Amp Chip
MIS           Heatsink For U1, Binding Posts (For Output), RCA Jacks (For Input)

If you like to build other audio circuits, you may start by trying our MOSFET amplifier collection, and then go on to build a hi-fi audio amplifier circuit. If you are still curious, please try our car stereo amplifier circuit as well.

Stereo Amplifier Circuit Diagram

stereo amplifier
Stereo amplifier circuit schematic

Power supply for this power amplifier project.

power supply for this circuit
12V 5A power supply for this project

A simple 12V,5A DC unregulated power supply is shown above. If 6A bridge is not available in your place you can make one using four 6A6 diodes and there will be no difference. 6A6 is a 6 ampere,600V silicon rectifier diode. LED D2 is added in the circuit as a power ON indicator and resistor R2 limits the current through it. Capacitor C7 is the filter capacitor while C8 is an AC bypass capacitor .S1 is the ON/OFF switch. Replacing the 9V transformer with a 12V transformer will increase the output voltage of the power supply to around 16V and you will get some extra power from the amp.



  1. Hi. can i ask if the power supply circuit you have shown is safe and working ?

  2. Jonathan

    Pls can this circuit be used as a subwoofer amp

  3. im a noob at circuits, so dont my question could sound dumb….
    there are 5 horizontal lines (i think its GND), what do i do with them? Please help

    • there are 5 horizontal lines (i think its GND), what do i do with them? Please help


    i like this very much.i have made this circuit for my
    mini project ,as i am doing engineering course in
    electronics and please send
    me the full the information and working of this
    circuit.thanks very much


    i like this very much.i have made this circuit for my mini project ,as i am doing engineering course in electronics and please send me the full the information and working of this circuit.thanks very much

  6. Ringo the single

    I like this schematic because it is very simple to impliment. Nice job men.

  7. seetharaman

    Hi Rohit National LM4780 and Sanyo STK4191V are the best choice if they are available.

  8. Rohit Kumar

    Hello Seetharaman,

    Thanks for the tip, will get the PCB made,

    Another thing, from your point of advice, what is a good IC based circuit for a 60 to 70 watts two channel amplifier using single IC.

    Thanks and regards

  9. Rohit Kumar

    Hello Seetharaman,

    Can i get hold of pcb for this circuit,

    thanks in advance

  10. Seetharaman

    Hi Caloy the low frequency response with 0.22uF is 14Hz. Whereas the IC it self is designed to roll off below 45Hz. Hence you cannot hear any improvement in amplifier’s low frquency response.

  11. mr.seetharaman im curious with the input coupling capacitors…the input coupling capacitors on the datasheet is 0.22uF w/c i followed…what would be the effect if i changed 0.22uF to 10uF???

  12. Seetharaman

    Hi Patrick connect input coupling capacitor (C1 & C2)to 10K potentiometer and use it as volume control (the input impedance of the IC is quite low).

  13. patrick vaz

    Hi Seetharaman,
    I want to induce a volume control for the above circuit, kindly advise where and what rating to be used.

    Still awaiting ur reply

  14. patrick vaz

    Hi Seetharaman,
    I want to induce a volume control for the above circuit, kindly advise where and what rating to be used.

  15. Seetharaman

    Hi Caloy you require atleast 4amps power supply to feel the power in dual 22 watts mode. at very low volue 300mA is OK. the quiescent current with 18 volt supply itself is around 170mA so for getting power out you require aleast 2amps.

  16. I just used 18 volts 300mA power supply for my experiment…

  17. I just used a 18 volts 300mA power supply for my experiment…

  18. Seetharaman

    Hi Caloy you have done the correct thing. 100k is just the right value to match output of 2822 and input of 1554Q.

  19. i made this amp together with TDA2822M and i put a 100k ohm series between the output of TDA2822M and input of TDA1554Q…
    this is just an experiment of mine and its my first time to do an amplifier…

  20. Seattle Pest Control

    Awesome insight as always. Keep it up.

  21. i want to get above 70watts from TDA7295 plz suggest the power supply circuit and tell all the components

  22. seetharaman

    Hi Adnan nothing will happen. Power supply voltage should not increase above safe operating limit of the IC. current requirements depends on the load and the volume kept. even though the power supply is capable of giving higher current the amp will draw only the required current.

  23. for this Ic we have to use 12v at 5A to get 22 watts per channel but if i connect a 12v 12amp supply what will happen is the IC will works or get burn?

  24. how much voltage & amperes of transformer will required for powering two TDA7295 at a time?

  25. seetharaman

    Hi Adnan you cannot. 24-0-24 is ok for one TDA7295.

  26. if i power two TDA7295 from 24-0-24 4 amperes transformer at a time will how much the total power i’ll get??

  27. seetharaman

    Hi Adnan refer specification you can never get 100 watts from this IC. Maximum peak RMS is 80watts for one sec but it can give you 50watts RMS continuous. This is tha capability of this IC.

  28. is there possible to get 100watts or not from TDA7295 at 24-0-24 4ampere transformer???

  29. seetharaman

    Hi Adnan you will get around 100watts per channel but as per the IC datasheet it will get limitted to 80 watts trnsient RMS

  30. if i use 24-0-24 4 amp transformer for the TDA7295 what will be the output at 6ohm load????

  31. seetharaman

    Hi Adnan 24-0-24 4 amps will be ok for stereo amp. For 4 channels it is insufficient the output will get limitted to 40watts if all the four channels are driven together. At high volumes it will be blaring and fully distorted.

  32. can i use 24-0-24 4amperes transformer instead of 24-0-24 2.5amp?????????
    and if i drive two Ic’s at a time with 24-0-24 4 amperes transformer what will be the output of one Ic???

  33. seetharaman

    Hi Adnan TDA7295 spec says it can give a peak rms of 80 watts into 8 ohms load just for 1 sec.
    Music Power (RMS) (*) Dt = 1s d = 10%;
    RL = 8W ; VS = ±34V 80Watts
    (***) RL = 4W; VS = ±26V 80watts
    For 8 ohms load you require 24 – 0 – 24 volt AC at 2.5 amps per channel you have to use around 10000uF filter capacitor for both positive and negative voltage to sustain transient.

  34. but one ic can give 80Watts according to the datasheet
    i want approx 70 to 75watts from an ic so what rating of transformer i have to use???

  35. seetharaman

    Hi Adnan you cannot exceed plus minus 30volt DC. plus minus 40 is absolute maximum voltage and can not be used. you can use a 21 – 0 – 21 volt transformer with 2.5amps rating, which will give you the required plus minus 30 volt DC is sufficient to get 50wats RMS per channel

  36. the ic TDA7295 requires 40v-40v 6 amperes on a single ic
    i have two tda7295 and i want to use ic as right and left channel with a single transformer how much voltage and ampere rating of transformer i have to use tell me?

  37. seetharaman

    Hi Adnan not possible you can bridge only two amplifiers.

  38. if i connect pin no 6 and 12 into speakers left and right input will it give 44 watts?

  39. seetharaman

    Hi Adnan with 12 volt 1 amp transformer you will be giving 12 watts energy input with 80% efficiency you will get approximately 10 watt out put. that will be 5 watts per channel in dual channel mode, in quad you will get 2.5 watts per channel.
    A good quality 12 volt 5 amp transformer is the most suited one for this IC to get 22 watts per channel into 4 ohms load.

  40. now i am using the 12v 1 ampere transformer what will be the loss or effect on output?

  41. can i use 12 volts 6 amperes transformer for this amplifier????

  42. The_M-4_man

    where can i get one of these TDA-1554 IC’s?

  43. i want to convert 250vac to 12volt 5A DC how can i do?

    if i use bridge diode wich model i can use?

  44. could i link together an input and a output to get a 44watt mono amp?