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simple circuit design

Discussion in 'Electronic Components' started by [email protected], Jun 19, 2007.

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  1. Guest

    I am looking for someone to prepare for me a fairly simple circuit
    design with all components and values specified. I will be happy to
    pay any reasonable amount for this service. what I want is
    a device which will accept the audio input from a condenser
    microphone, and pass it through a low-pass filter which will only pass
    frequencies up to 12 Hz with a fairly sharp cut-off. The filtered
    output should be fed into a device such as an LED array which will
    approximately reflect the dominant frequency in the range 0 to 12.
    Ideally, the voltage supply will be 6V.

    If this is insufficient information, please get back to me.

  2. mc

    mc Guest

    Since this sounds like a Fourier transform, you may also want to post on

    My first worry would be that the condenser microphone doesn't have any
    useful sensitivity at frequencies that low.
  3. legg

    legg Guest

    Especially at the low end, 0Hz.

    Actually, at those frequencies, you might just be satisfied with
    counting the blinks.

  4. Bob Woodward

    Bob Woodward Guest

    There are microphones that are perfectly capable of picking-up
    frequencies as low as 0.1 Hz
    They are available, sold as measuring microphones.
    When your budget is not sufficient, a more
    conventional microphone can be modified to do so.
    This microphone needs to be a omni-directional type condensor mic.
    These are pressure-sensitive microphones.
    Electronics needs to be modified for DC-coupling.
    And when modifying, the low-pas can be done at-once.

    But please be aware that this conventional microphone will still
    be a studio-quality type costing $ 1000.- or more

  5. Eeyore

    Eeyore Guest


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