Microphone - transistor switching on a led

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hi i want to use a microphone connected to the base of a transistor.yhe transistor should work as a switch . it should turn on with a sound to the micro phone. does anyone know what voltage the mic can produce?what kind of microphone do i need and what kind of transistor?the circuit is designed to light up a led. The voltage supply of the circuit, probably fixed to the collector of the cicrcuit is 3,8v.thank you
 

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