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Sound level circuit

Discussion in 'Electronic Design' started by Medic, Jan 25, 2006.

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  1. Medic

    Medic Guest

    Hi experts,

    I need a circuit to measure engine noise. At the moment I have a
    electret mic and some simple analogue filtering to give me the
    frequency range but I then have to do a lot of processing on the

    I've seen LM3915 type ICs that give 10 outputs over a range of dBs, is
    there a simple way or other ICs that can give me better resolution.

    I'm using the mic to monitor if the engine in running and need an
    output that gives a range of about 1000 steps resolution.

    Thanks in advance

  2. John Fields

    John Fields Guest

  3. Maybe you want a precision rectifier, LPF and analog log circuit? It's
    not entirely clear to me what you are up to.

    Best regards,
    Spehro Pefhany
  4. Ian Stirling

    Ian Stirling Guest

    1db is typically inaudible, so 100 steps would usually be just fine.
  5. Mark

    Mark Guest

    you can buy a sound level meter at radio shack for $50

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