PAM8403 is a small digital amplifier chip, high-definition sound highlights the advantages of digital chips, the circuit uses the most reasonable peripheral configuration, power supply filter is upgraded to 470uf
A potentiometer with a switch reversible clock can directly cut off the power
Power supply range: 5 VDC
Minimum output: 3W x 2
Dimensions: 29.5 x 20.2 x 15mm (without protruding potentiometer rod)