feat: add Class D Audio Amplifier HAT tutorial with PAM8403#741
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- Complete tutorial for building a Raspberry Pi HAT with PAM8403 Class D amplifier - 3W per channel stereo output with volume control - Interactive tscircuit circuit preview with full schematic - Bill of materials, PCB layout guidelines, and testing procedures - Raspberry Pi audio configuration (PWM, ALSA) - Software mute control via GPIO - Troubleshooting guide Closes tscircuit#603
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Summary
Adds a comprehensive Class D Audio Amplifier HAT tutorial using the PAM8403 chip.
/claim #603
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Wallet: 0x911d202f713Ee2ad139E8b8b8a0A712347eFE31f