Low noise Mini Electret Microphone PreAmplifier

  • Rajkumar Sharma
  • 15240
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  • easy
  • Tested

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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

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Parts List

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Photos

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Video

PCB

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