0 Simple Microphone Pre-amplifier Circuit

A cheap pre-amp for microphones using transistors. The input audio signal is amplified around 120 times.

Pre-amp schematic

Part List:

R1, R2, R5 - 120 kilo ohms 1/4W

R3, R6 - 12 kilo ohms 1/4W

R4 - 100 ohms 1/4W

C1, C2, C4 - 100nF capacitor

C3 - 10uF electrolytic capacitor rated 16V

Q1 - 9013, 2N2222 or similar NPN transistor

Q2 - 2N3906 or similar PNP transistor

INPUT - use condenser microphone (electret will not work)