How to Build a High Efficiency Class-D Audio Amplifier Circuit using MOSFETs
Simple Class D Amplifier Schematic
Hypex DIY Class D Audio amplifier UcD400HG
Amazon.com: 12V Amplifier Board, DROK 15W+15W 2.0 Dual Channel Audio Amplifier Board PAM8620 DC 8-26V 24V Digital Stereo Amp Module Class D Mini Power Amplify Circuit for Sound System Speaker DIY :
You Can DIY!: High-End Class-D Audio Board for the Arduino MKR Family | audioXpress