Bounty: Add Class D Audio Amplifier HAT tutorial

[BossChaos]

Bounty Request

Add a comprehensive tutorial for building a Class D Audio Amplifier HAT.

Requirements:

• PAM8403 Class D amplifier chip
• 3W per channel stereo output
• Volume control
• Speaker terminals

Expected deliverable:
A complete tutorial in docs/tutorials/ with:

• Step-by-step circuit design
• Class D operation explanation
• Raspberry Pi integration
• Audio configuration guide

[BossChaos]

/claim #603

PR: #600

Tutorial covers:

• Class D Audio Amplifier HAT with PAM8403
• 3W per channel stereo output
• Volume control with audio potentiometer
• Raspberry Pi GPIO audio integration
• EMI considerations and troubleshooting

Wallet for bounty: 0xdaE5d307339074A24F579dB48e7c639359D94904

[BossChaos]

🎯 Tutorial done! PR: #607

Complete guide covering circuit design, components, PCB layout, and firmware. Wallet: 0xdaE5d307339074A24F579dB48e7c639359D94904

[zp6]

PR submitted: #615

Wallet: zp6

[JPL-Jarvis]

I’ll take a fresh build-passing pass at #603. Plan: add a Class D Audio Amplifier HAT tutorial under docs/tutorials/pi-hats/, covering a PAM8403-style stereo amp, volume control, speaker terminals, Raspberry Pi audio wiring/config, BOM, layout notes, and bring-up checks. I’ll verify with the docs build before opening the PR.

[Misch369]

/claim #603 via #643

I have added the comprehensive Class D Audio Amplifier HAT tutorial as requested.