Inside This Wonder of Electromechanical Manufacturing
Amazon.com: uxcell 8Pcs Cylindrical Electret Condenser Microphone Pickup 85dB Through Hole Mini Electret Condenser Mic with 2 Pins 10x7mm for PCB : Musical Instruments
Electret Microphone Amplifier - MAX9814 with Auto Gain Control : ID 1713 : $7.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Building A Top-Notch Electret Microphone | Hackaday
Electret microphone - Wikipedia
Electret Condenser vs True Condenser Microphones
Electret Microphone Amplifier - MAX4466 with Adjustable Gain