They’re so simple, you can buy a class D amp chip for $3, but [George] thought that would be too easy. Instead, he built his own with an ATTiny and an H-bridge motor driver.

Class D audio amplifier with 4th order output filter and self-oscillating full-state hysteresis based feedback driving capacitive transducers, Dennis Nielsen, Arnold Knott & Michael A. E. Andersen, ...

A block diagram of the Class-D amplifier is shown in Figure 1. The techniques discussed in this paper describe how a single-frequency, sine wave signal was generated through a Class-D amplifier with ...

Class D amps from $130 to $50,000—pulling more ears into hi-fi without demanding you sell a kidney. Solid tech, serious power, and none of the usual overpriced fluff. Finally, affordable doesn’t sound ...