A Class D amp is just an oscillator, comparator, and an output stage. All of which can be fulfilled (although poorly) by a single 555. I designed a Class D amp in SPICE, using only a LM339 and ...

A.2 Audio Amplifier. The audio amplifier part consists of the PAM8403 [3, 4] chip. This chip is a 3W+3W HiFi Class-D amplifier that can operate with only a single 5V supply. The maximum output power ...

An Arduino Due forms the heart of the project, ... The sound signal is passed through an LM4811 headphone amplifier for private listening, and a PAM8403 Class D audio amplifier for the built-in ...