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.
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)
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
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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