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electret mic hookup

Discussion in 'Electronic Components' started by mrat, Apr 6, 2004.

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  1. mrat

    mrat Guest

    I put together this mini FM transmitter. It seems to work because I
    can hear the buzz in my radio change whenever I mess with the coil or
    the on/off switch. But I can never hear the audio that should be
    coming through.

    I don't know that much about this type of thing, but I took the mic (I
    got it at Radio Shack) and tried to hook it up directly to a speaker
    using several different schematics I found for electret mics.

    www.epanorama.net/documents/audio/electret.html

    All I got was nothing except for when I attached the battery I can
    hear the speaker flutter a bit.

    Does this mean I have a bad mic or am I just not hooking it up
    properly?
     
  2. Microphones, even when they are working properly, only generate a very weak
    signal. They require amplification in order to be heard on a speaker.

    Have you tried powering the FM transmitter with a known-good source of
    signal, such as the output of a CD player? That could help you determine
    whether the problem is with your microphone circuit or with your mini
    transmitter.

    By the way, if you study carefully you'll see that the two schematics on the
    web page you cite are identical except for the value of the capacitor. That
    suggests that the author of the page is simply posting circuits he's found
    elsewhere, without any effort to understand or test them. That will tend to
    lead to frustration on the part of people who build those circuits, such as
    you.
     
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