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AZDelivery Max9814 Microphone AGC Amplifier Board 2.7V - 5.5V Auto Gain Control Amplifier 40dB/50dB/60dB compatible with ESP8266, ESP32 and Arduino Including E-Book! : Amazon.co.uk: Musical Instruments & DJ
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Electret Microphone Amplifier - MAX9814 with Auto Gain Control | Adafruit ADA1713 | Core Electronics Australia
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