Deferential PWM Audio Signal Audio Amplifier for Voice Record/Playback, Music, and Sound Effects IC Using LM386

Lots of Voice Record playback, music and sound effects IC provide PWM signal output to drive small speaker which is usually low signal just can drive small speaker.  Boosting this signal required special audio amplifier which amplify the deferential PWM signal.  This amplifier is solution and help to amplify PWM +/- dual signal, the amplifier is based on LM386 IC.

PCB Design Using  THT Components