feat: add Class D Audio Amplifier HAT tutorial#710
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Add comprehensive tutorial for building a Raspberry Pi HAT with a PAM8403 Class D audio amplifier. Includes: - Step-by-step schematic capture with interactive previews - Class D PWM operation explanation - Raspberry Pi integration (5V power, aux input) - Audio configuration guide (raspi-config, aplay, alsamixer) - Dual potentiometer volume control integration - Decoupling and coupling capacitor sizing - Complete bill of materials - PCB layout considerations for audio Closes tscircuit#603
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/claim #603
Summary
Adds a comprehensive tutorial for building a Class D Audio Amplifier HAT with the PAM8403.
What's included
Requirements from issue #603