Inside Electret Microphone

Electret Microphones come in all kind of sizes. Let us look inside three of these:

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Type 1

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Type 2

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Type 3

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Few useful links explaining the construstion and use of Electret Microphones:

• HyperPhysics
• WM-60a , WM-61a microphone modification
• SparkFun
• Powering Microphones 
• History
• Hosiden
• MEMS enables multi-microphone consumer products (Article in EDN, Photo of Electret Microphone Schematic)

These Microphones are available in Mumbai, India from Visha Electronics Corporation