Amazon.com: Adafruit Electret Microphone Amplifier - MAX9814 with Auto Gain Control [ADA1713] : Electronics
Amazon.com: MAX9814 Electret Microphone Amplifier Board Module MIC Auto Gain Max 40dB/50dB/60dB Frequency 2.7V-5.5V with Pins for Arduino : Electronics
MAX9814 Microphone AGC Amplifier Board Module Auto Gain Control CMA-4544PF-W | Satistronics
MAX9814 Electret Microphone Amplifier Module Auto Gain Control AGC for Arduino | eBay
Electret Microphone Amplifier - MAX9814 with Auto Gain Control — PMD Way