Home Projects Audio MIC Pre-amplifier


MIC Pre-amplifier
author: Rajkumar Sharma

This project is a microphone pre-amplifier based on LM358


This is easy to construct microphone pre-amplifier project using compact electret condenser microphone. The pre-amplifier is important building block of many audio communication systems. Circuit has been built around Op-Amp LM358.    

- Power supply : 5 to 12 VDC @ 10 mA  
- Output: Gain Approx. 100
- On-Board electret condenser microphone   
- Header connector for connecting of power supply input and audio output  
- Power-On LED indicator  
- Four mounting holes of 3.2 mm each  
- PCB dimensions 35 mm x 40 mm


Parts List




120x90 spot



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