Low noise Mini Electret Microphone PreAmplifier

Rajkumar Sharma      http://www.rajkumarsharma.com  
6295
Project tested

img_5973

The single supply microphone pre-amplifier amplifies the output signal of an electret capsule microphone to audio line levels. An op amp is used as a trans-impedance amplifier to convert the output current from the microphone in to a signal level voltage. The circuit works with 9V so it is good choice for battery operated systems.

Features

  • Supply 9V DC
  • Current Approx. 3mA
  • On Board Microphone
  • Very thin and narrow PCB

Schematic

sch

Parts List

bom

Photos

img_5974

Video

PCB

Leave a Reply