Mini Mic Pre-Amplifier

Mini Mic Pre-Amplifier Circuit based IC LM358

The following diagram is a easy to build, simple and low cost mic pre-amp circuit which build using op-amp chip of LM358.

Component Parts List:
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
Notes:

• Vary the 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.