Typical electret microphone schematic. This is a replacement for Image:ElektretMikVerst.PNG, which is not a typical circuit.

A typical electret microphone preamp circuit uses a FET in a common source configuration. The two-terminal electret capsule contains an FET which must be externally powered by supply voltage V₊. The resistor sets the gain and output impedance. The audio signal appears at the output, after a DC-blocking capacitor.

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Created by User:Omegatron using Klunky schematic editor, which the creator considers public domain (possibly with post-editing in the GIMP or Inkscape)

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