Expansion Shield x400 for Raspberry Pi B+/2B/3B/4B - DFRobot
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Raspberry Pi HIFI AMP Amplifier Expansion Board Audio Module for Rasp – Lonten Technology
MERUS™ Audio Amp Kit for Raspberry Pi - Infineon | DigiKey
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Adafruit I2S 3W Class D Amplifier Breakout - MAX98357A
Amazon.com: RPI HiFi AMP HAT TAS5713 Amplifier Audio Module 25W Class-D Power Sound Card Expansion Board for Raspberry Pi 5 4 3 B+ Pi Zero Nichicon Capacitor : Electronics
Pirate Audio: 3W Stereo Speaker Amp for Raspberry Pi : ID 4453 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits