How to use an electret microphone

An electret is a permanently charged dielectric. It is made by heating a ceramic material, placing it in a magnetic field then allowing it to cool while still in the magnetic field. It is the electrostatic equivalent of a permanent magnet. In the electret microphone a slice of this material is used as a part of the dielectric of a capacitor in which the diaphram of a microphone forms one plate. Sound pressure moves one of its plates. The movement of the plate changes the capacitance. The electret capacitor is connected to an FET amplifier. These microphones are small, have excellent sensitivity, a wide frequency response and a very low cost.

BUY_ELECTRET_MICROPHONE

The terminals:

The terminal with a solder mark(connecting to the case) is negative and the terminal without a mark is positive.

The marked terminal is negative.

Projects the use electret microphone:

1. FM transmitter- circuit 1: This is a DIY kit. A low cost and excellent DIY kit for amateurs to begin with FM transmitter. This project uses electret microphone.

  • 1 Transistor FM Transmitter DIY Learning Kit

    US $9.50
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    1 Transistor FM Transmitter DIY Learning Kit

    US $9.50
    56 items sold
    Item Location: Sydney, Australia
    You can use this FM transmitter/microphone in two ways:
    a. Audio transmission using electret microphone: You can transmit your voice to FM radio with the electret microphone.

    b. Audio transmission connecting speaker stereo jack to the audio source: For hearing a better sound, you may connect it to your computer, iPod or mp3 player using a speaker jack.

    110 in stock

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2. FM transmitter- circuit 2: This is a one-transistor FM transmitter. It is a good circuit for beginners. It also uses electret microphone.

3. Clap switch: It is a simple clap switch circuit. It can be a good start for electronic beginners.

4. Clap switch DIY kit: It is an easy and low cost DIY kit for electronic beginners. This kit is available on buildcircuit.net

5. Clap switch using 3 modules: It is one of the interesting projects of BuildCircuit. This project shows how you can build a clap switch using three different and independent circuit modules.

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