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You are here: Home / Circuits & Projects / The Simplest Amplifier Circuit Diagram

The Simplest Amplifier Circuit Diagram

May 14, 2013 By Øyvind Nydal Dahl 144 Comments

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 stripboard 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 the left and right channels 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

PartValueDescription
C1100µFPOLARIZED CAPACITOR
C2100µFPOLARIZED CAPACITOR
C3100µFPOLARIZED CAPACITOR
C4100µFPOLARIZED CAPACITOR
C5100µFPOLARIZED CAPACITOR
C6470µFPOLARIZED CAPACITOR
C7100µFPOLARIZED CAPACITOR
C8470µFPOLARIZED CAPACITOR
C90.22µFNON-POLARIZED CAPACITOR
C100.22µFNON-POLARIZED CAPACITOR
C110.15µFNON-POLARIZED CAPACITOR
C120.15µFNON-POLARIZED CAPACITOR
TEA2025TEA2025BAmplifier chip
SPKR1 4-8 Ohm speaker
SPKR2 4-8 Ohm speaker
R1+R210KDUAL Potentiometer

The 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)

How Can I Help You?

I want more people to build better and cooler projects. Everyone can improve even if they are complete beginners or have built many circuits from before.

Let me know your comments and questions below!

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More Circuits & Projects Tutorials

  • Basic Circuits
    • Blinking Light Circuit
    • Automatic Night Light
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