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Simple electret "pre-amp"

Discussion in 'Electronic Basics' started by [email protected], May 1, 2007.

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  1. Guest

    I am using a Logitech/Labtech USB microphone which is doing an okay
    job but could benefit from some more gain. I don't want to touch their
    ADC and USB circuit but would prefer adding something in-line. Given
    that their 2-wire electret micro is powered by 2.5v on the signal line
    what would be a simple way to say double the signal seen by the
    circuit downstream ?
  2. Lord Garth

    Lord Garth Guest

    Use an opamp configured to provide a gain of 2.

    The o-l-d LM1458 dual opamp would work fine
    and it runs on a single ended supply.
  3. Eeyore

    Eeyore Guest

    It's doesn't run on 2.5V though does it ?

    A TLC271 might be ok.

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