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Needed: Phase Converter Box

Discussion in 'Electronic Equipment' started by T. G., Sep 2, 2003.

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  1. T. G.

    T. G. Guest

    To the Group:

    I am looking for a 180 degree phase converter unit that I can plug a
    microphone into and output to an amplifier for noise-cancelling
    purposes. (Thanks in advance.)

    T.G.
     
  2. Balanced or unbalanced mic? If balanced, it's just a matter of swapping
    pins 2 and 3; you can get ready-built XLR adapters that do this, for about
    $25, from suppliers such as Markertek. If unbalanced, a bit more work
    involved.

    Or, you could just reverse the speaker wires.

    Note that depending on what you're trying to do, it is unlikely to work:
    sound travels at about 1msec/foot in air, so unless your mic is right next
    to your loudspeaker you get comb filtering rather than actual rejection, and
    you'll actually get boost at some frequencies.
     
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