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Fully Self-Contained Raspberry Pi Audio HAT Board with MERUS Class D Multilevel Amplifier Now Available | audioXpress
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MA12070P+ESP32/Raspberry Pi Power Amplifier Board Raspberry Pi Attach IIS I2S | eBay
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Pirate Audio: 3W Stereo Speaker Amp for Raspberry Pi : ID 4453 : $24.95 : Adafruit Industries, Unique & fun DIY electronics and kits
