Amplifier Circuit Diagram

I have been looking for a good stereo amplifier circuit diagram for a long time. I am not a HiFi geek, I just wanted to build a simple stereo amplifier that could drive some speakers for my desktop computer.

stereo-amplifier-board-layout

All the schematic diagrams that I could find seemed to involve lots of hard-to-find components or you had to use it together with a pre-amplifier or some other amplifier stage. It was always something that made me hesitate.

But recently I found this awesome little chip called TEA2025! You only need a few capacitors to make a decent stereo amplifier out of it. It is so simple to build that I put it together on a strip board in just a few hours.

2.5W * 2 Stereo Amplifier

The amplifier circuit diagram shows a 2.5W * 2 stereo amplifier. You can also make a 5W mono amplifier out of it. (Check out the TEA2025 datasheet for more information on that)

Stereo Amplifier Circuit Board

On the input side, you should use a dual potentiometer. A dual potmeter allows you to connect both left and right channel on one potentiometer.

This amplifier is great to use together with some speakers to get sound on your desktop computer. I am thinking of putting one in my kitchen and in my bathroom also. Then maybe hook them up to my home network and stream music from a server =) There are many possibilities when you can make such a cheap amplifier.


Amplifier circuit diagram and parts list

A Stereo Amplifier Circuit Diagram

Parts list

Part Value Description
C1 100µF POLARIZED CAPACITOR
C2 100µF POLARIZED CAPACITOR
C3 100µF POLARIZED CAPACITOR
C4 100µF POLARIZED CAPACITOR
C5 100µF POLARIZED CAPACITOR
C6 470µF POLARIZED CAPACITOR
C7 100µF POLARIZED CAPACITOR
C8 470µF POLARIZED CAPACITOR
C9 0.22µF NON-POLARIZED CAPACITOR
C10 0.22µF NON-POLARIZED CAPACITOR
C11 0.15µF NON-POLARIZED CAPACITOR
C12 0.15µF NON-POLARIZED CAPACITOR
TEA2025 TEA2025B Amplifier chip
SPKR1 4-8 Ohm speaker
SPKR2 4-8 Ohm speaker
R1+R2 10K DUAL Potentiometer

Total cost of the components (excluding speakers) is about $9. The most expensive component is the potentiometer (about $3-4).

Download Eagle schematics and board layout

Here is the schematics (Eagle), PCB board layout (Eagle) and Gerber files. This board was made to comply with the design rules of Seeed Studio (May 2013).

Stereo-Amplifier-TEA2025-(Eagle)

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Comments

  1. Ravi verma says

    Hello Oyvind,
    Thanks for this useful post. i tried this single chip stereo amp. and it worked. but the problem I faced is there is lots of noise also. first i thought it could be a problem with speaker I used (i got my speakers from toy cars,they lied in the said resistance range), so I moved to market available speakers. but the problem persist. Can u suggest me some solution to get get the rid of this noise. any help will be appreciated.
    Thanks and KEEP SOLDERING :)

    • admin says

      Hey Ravi!

      Cool to hear that you made the circuit =)

      If the input signal is too high, you will get clipping on the output. This will make the sound noisy.

      So first, check if you have the noise problem when the volume is turned down: (R1+R2) pot turned to a high resistance value.

      Cheers!
      Oyvind

      • Ravi verma says

        Thanks for your quick reply,
        I tried your suggested solution and yes the noise is still present at lower volumes.
        And then just for experiment I used higher range speakers(~15 ohm , 5 watt), and the problem was gone :).
        but i also doubt that using these higher higher range speakers ,in a continuous run, the circuit might get damaged. Right?
        And one more thing , i think i should add, I am using USB power supply. As I want to make it completely portable.
        Thanks. :)

        • Øyvind Nydal Dahl says

          No it shouldn’t be a problem to use higher Ohm speakers. And higher Watt-rating of the speaker just means it can handle more power.

          Maybe your old speakers just had too low Watt-rating…

          Anyway, great that you got it working! =)

          Cheers!
          Oyvind

  2. Jared says

    Hey, thanks for the great schematic, I was actually looking to make an audio amp and this one looks awesome! Although, I was looking for a way to turn this into a 5 Watt mono amp on the datasheet, but couldn’t find anything. :/
    Any help, or am i just being stupid? Should I just use a mono amplifier with similar specs as the tea2025?
    Thanks in advance!

  3. Ikenna says

    Pls oyvind,help me here also(i will download your book sooner by grace)can you provide me with a schematic of 4 stage transistor 2.5w mono or stereo audio amp.pls spare the effort to send me the link to this.God bless.

  4. rocker says

    i hav took this ic from my creative speaker and some other parts and made the circuit.but it is not working.i didn’t receive any response from speaker .can u make a video in makin this circuit in breadboard. plz help me

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