A Bit More Than A Microphone: The Electret Story | Hackaday
True Condenser Vs. Elektret Condenser - What's the Difference?
Amazon.com: NEW LON0167 5 Pcs 10mm x 7mm Through Hole Mini Electret Microphone Condenser Pickup(5 Stck 10mm x 7mm Durchgangsloch Mini Electret Mikrofon Kondensator Pickup : Musical Instruments