Microphone electronic circuit

Microphone amplifier circuit is simple, consisting of 2 levels. with wide dynamic regions, small noise, and can with a long cable about 50 meters.

This circuit uses low noise transistors are type types: BC 650 C, the transistor is hard to find so may be replaced with BC 109 is no less good. EMC or inside electret condenser mic element micriphone are very sensitive and an internal FET preamp circuit, so the voltage needs to EMC is between 2-10 volts, for that we put a resistor 1 K-10 K ohms to provide the EMS.