Simple Preamp Mic using LM358

This is a simple audio mic pre amplifier circuit based on single IC LM358. The circuit is very simple, inexpensive and easy to built.

 

Rangkaian Simple Preamp Mic using LM358

LM358 Pinout

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