Electret Microphone Amplifier - MAX4466 with Adjustable Gain : ID 1063 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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Sound Sensor Detecting Module LM393 Electret Microphone for Arduino - Buy and Sell Hardware Products, DIY Electronics and Kits, HuaQiangBei Online Store - PCBWay