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Electret Microphone Amplifier Max4466 Adjustable Gain Breakout Board Module For Arduino Max4466 Pcb Board Module Diy Kit - Integrated Circuits - AliExpress
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Electret Microphone Amplifier - MAX9814 with Auto Gain Control : ID 1713 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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