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Microphone For Computer

Discussion in 'Electronic Basics' started by Radio Man, Apr 19, 2005.

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  1. Radio Man

    Radio Man Guest

    I want to experiment using a dynamic mic
    with my computer. I believe i would have to
    connect a capacitor in series with the hot or negative
    side of the mic? Also what type & value of cap?
     
  2. John Fields

    John Fields Guest

    If it's a dynamic (moving coil) microphone you shouldn't have to use a
    capacitor at all.
     
  3. Radio Man

    Radio Man Guest

    Since i'm presently using an electret mic which derives it's power from my
    computer, i thought i would need a blocking capacitor for a "moving coil"
    mic?
     
  4. Lord Garth

    Lord Garth Guest

    If it is an electret type, you will need a phantom power circuit.

    Basically, the mic - is ground
    The mic + connects to a resistor. The other end of the resistor connects to
    the battery.
    The exact value depends on the voltage you supply and the current you want
    to provide
    but something like a 3k would be a start and 1.5 volts.

    To extract the audio, connect a 1uF or so capacitor to the mic+ / resistor
    junction and send
    this to the sound card.

    look here:
    http://www.eclectic-web.co.uk/index.php?jump=http://www.eclectic-web.co.uk/mike/electret_a.htm
     
  5. Radio Man

    Radio Man Guest

    Garth,
    My question refers to a "Dynamic Mic (Moving Coil),
    not an electric mic!
     
  6. John Fields

    John Fields Guest

     
  7. Lord Garth

    Lord Garth Guest

    Gotcha! first that would be very odd for any Sound Blaster compatible to
    provide power.
    They don't so if that is what you have, just plug in the dynamic mic. If
    you need to block
    DC because your sound card really does supply power, add a series cap...
    1uF would be fine
    be aware that the low end may suffer a bit since Xc=1/(2*pi*F*C). You might
    simply
    reduce the high frequencies a bit to adjust the response.
     
  8. Radio Man

    Radio Man Guest

    Thanks to john fields & lord garth for their "Input" : > )
     
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