The PAM8403 amplifier is a sweet little amplifier wich produces about 2×3 watts at 5 volts power supply.
This is the complete amplifier!
Connections from left to right:
Speaker left – speaker right – power supply – audio in.
I use an 18650 cell and an charge / protection board as power supply.
The amplifier is mounted in the housing of an broken ac adapter, the speaker connections are from an broken home cinema set.
All you need is hotglue. 