A microphone preamp is
 a preamplifier used to amplify a microphone's low output voltage to a 
stronger, more usable level. A microphone preamp must provide stable 
gain for small signals without being sensitive to induced noise from 
cabling and without distorting large amplitude signals. Most microphones
 must be used in conjunction with a microphone preamp to function 
properly.
Simple audio Pre-Amp mic
This circuits use infront an RF oscilator to make an RF transmitter that is very sensitive  to sound
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