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elektret microphone

Nederlandse schematic permalink: http://www.amateurtele.com/index.php?artikel=12&id=#24
Electret microphones are note sensitive for electromagnetig (RF) fieds, small and also quite ruggid. These microphones are therefore ideal for transceiver purposes. Electret microphones do need a DC voltage to work. Due to the changing resistance in the microphone element while talking, the current changes trough the microphone element. By applying a capacitor, the audio will be "converted" to an AC electrical (audio) signal.

The basic schematic is shown below. Due to different microphone element types and different supplied DC voltages, the resistance value should be changed to achieve the best audio results.

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