MIC Pre-amplifier

  • Rajkumar Sharma
  • 32546
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  • moderate
  • Tested

MIC_PRE-AMP_PIC

This project is a microphone pre-amplifier based on LM358.

Description

This is an easy to construct microphone pre-amplifier project using a compact electret condenser microphone. The pre-amplifier is the important building block of many audio communication systems. The 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

Schematic

Parts List

Gerber View

PCB

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robert

thanks for this

Caleb

Could I replace the mic you used with an XLR input? Trying to figure out how to make an adjustable XLR preamp for cameras.

Sivanand

LM358 is not a low noise IC, Use of TLO71 / TLO81 would give better low noise response, cheap and easily available.

Pablo

The foil side of the PCB image has to be mirrored. In that case your logo and the “800A” would be backwards.

Pratyusha

Hello, I have given the same circuit in the bread board, & i have given input from my phone with the help of 3.5 mm audio jack…..but i couldn’t hear the output through earphones or audio jack. I can guess some processing is happening. The earphones are working properly,and i couldn’t find out where the problem is…..please help.

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