Low noise Mini Electret Microphone PreAmplifier

Low noise Mini Electret Microphone PreAmplifier

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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

Low noise Mini Electret Microphone PreAmplifier – [Link]

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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1 Responses

  • Audioguru
    20 September, 2016 at 9:02 pm

    The schematic shows the polarity of the output capacitor is connected backwards. A polarized capacitor is used at the input but its polarity is unknown, an unpolarised film capacitor should be used.

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