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Sound level meter

Discussion in 'Electronic Design' started by Damien, Nov 18, 2003.

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  1. Damien

    Damien Guest

    I found a circuit diagram for a sound level meter, which is almost exactly
    what I need except for one thing - the display uses an LED bar graph,
    whereas I'd really like to know exactly what the noise level is. Is there an
    easy way to modify the circuit to use a numeric display, or should I just
    compromise and go with the design as it is?

    TIA for any assistance.

  2. Without a calibrated reference mic, it is unlikely that it will have the
    accuracy to make any numbers meaningful. Right now it tells you in 10dB
    brackets, which is good enough to let you know whether you're at risk of
    hearing loss. If you want better, e.g. to equalize a listening room, you're
    probably better off buying a calibrated meter.
  3. Damien

    Damien Guest

    I suspected as much - should be accurate enough for my purposes, it just
    would have been good to get the numbers if possible. And given the price of
    components and making something myself, compared to the price of buying a
    meter, I think I can live with that level of accuracy!

  4. If you can live with 10dB accuracy but you'd still like to see actual
    numbers, you could use a diode matrix to drive the segments of a
    seven-segment LED display. That way instead of lighting up the "70" LED,
    for instance, you could actually have it display "70". (Of course, you
    wouldn't need to control the units digit from the meter, since it would
    always just be "0"; all you'd be controlling is the tens digit.)
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