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need simple microphone pre-amp opamp circuit

Discussion in 'Electronic Design' started by [email protected], Feb 18, 2006.

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  1. Guest

    I have to throw together a simple op-amp based electret microphone
    pre-amp circuit on the road (limited access to hardware) - yes I feel
    like Mcguiver.
    I have access to a LM357 op-amp that I need to use with a single 6v
    Anyone have a simple circuit that will work with a single supply
    powered op-amp?
  2. Phil Allison

    Phil Allison Guest

    ** Don't you mean the LF357 ?

    ** Although this op-ap is not spaced by Natsemi to operate with less than
    +/- 5 volts supply - it will still function with reduced specs with a 6
    volt single supply.

    Just use a standard inverting amp stage and bias the + input to 3 volts.

    Suggest the input resistor be 3.9 kohms and the feedback a 250k ohms pot.

    ........ Phil

  3. Google for "opamp electret mic preamp" (without the quotes).
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