Low noise Mini Electret Microphone PreAmplifier

  • Rajkumar Sharma
  • 29367
    Views
  • easy
  • 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

Parts List

bom

Photos

img_5974

Video

OPA172 Datasheet

opa172

PCB

Comments

  • JensJ

    Thank you for this. Modified it to run on a 5V supply and using another OP-Amp and it works perfectly with those alterations.

    2 years ago
    • Could you let us know what modifications you have done to this circuit and why?

      2 years ago
  • Dan Gonzalez

    the capacitor C5 is well polarized in the diagram, or is it a misprint

    5 days ago
    • Thanks for noticing this fault. We fixed it above in schematic

      3 days ago

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