Microphone circuit diagram

 Microphone : Microphone is a input device its input sound and convert electrical signal .

This is Microphone

Now we make a Microphone .
If you make microphone its main problem is noise . we need a noise free microphone so need 3 volt DC power supply must be use battery .
Its very simple and low cost circuit .Only three resistance two capacitor one transistor and one mic .

Microphone Circuit Diagram