Simple Preamp Mic using IC LM358

Simple Preamp Mic using IC LM358

This circuit is a simple audio microphone preamp based on a single IC LM358. The circuit is very simple, cheap and easy to build.

Note:

• variable resistor of R5 to adjust the gain of op-amplifier IC LM358.
• The LM358 has two op-amp module, you may build stereo audio pre-amplifier using single LM358.

Component list of simple preamp mic circuit:

R1, R3, R4 : 10K
R2         : 1K
R5         : 100K-1M Potensiometer
C1         : 0.1uF
C2         : 4.7uF/16V
IC1        : LM358 dual op-amplifier
Mic        : Electret Microphone