Amazon.com: Electret Microphone Amplifier MAX4466 Adjustable Gain Breakout Board for Arduino MAX4466 Module DIY Electronic Module : Electronics
Electret Microphone Amplifier - MAX4466 with Adjustable Gain : ID 1063 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Electret Microphone Amplifier - MAX4466 with Adjustable Gain — PMD Way
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
Amazon.com: MAX9814 Electret Microphone Amplifier with Auto Gain Control for Arduino(Pack of 2pcs) : Electronics
Lm393 Microphone Amplifier Sound Sensor Mic Voice Module for Arduino R5e2 for sale online | eBay
How to Use a Microphone with Arduino (Lesson #12) - YouTube
How to Use Microphones on the Arduino - Circuit Basics