[Elecraft] CM-500 dynamic mic vs electret

[Bill Steffey NY9H]

in our ham classes  it's very easy to explain dynamic mics...

it is just a speaker  !!!  so if you apply a bias voltage it will try to 
push the dynamic element       ( speaker cone) in or out & HOLD IT !!!!  
making it difficult for audio to create an AC alternating current on 
that same , (now DC biased) voice coil.


Many a speaker has been forced into service as a microphone, and is a 
frequent design element as both in an intercom.


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