1 watt audio amplifier shown below is very simple and easy to make. You can use this in making pocket amplifier for your mp3 player. It can fit in small mactch box size box.
Parts List for making 1 watt audio amplifier
- Q1 Transistor – MPSW45A
- R1- 50 ohms
- R2- 10 K
- R3,R4 – 100 K
- 9 volt battery and Speaker
If you need more power you can view my other post on audio amplifier using LM386