docs: add Class D Audio Amplifier HAT tutorial#600
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This tutorial covers: - Building a Class D stereo amplifier using PAM8403 - Raspberry Pi HAT design with GPIO audio outputs - 3W per channel at 5V with 90%+ efficiency - Volume control with audio potentiometer - Speaker terminal connections - Power supply decoupling and filtering - Raspberry Pi audio configuration and testing - EMI considerations and troubleshooting
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Summary
Adds a comprehensive tutorial for building a Class D Audio Amplifier HAT for Raspberry Pi:
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