VU meter

Discussion in 'The Projects Forum' started by cmsch180, Jul 3, 2008.

  1. cmsch180

    Thread Starter Member

    Jun 26, 2008
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  2. SgtWookie

    Expert

    Jul 17, 2007
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    You'd be far better off using an LM3916, because it's designed for use as a VU meter.
    The LM3915 is logrithmic, the LM3914 is linear.
     
  3. cmsch180

    Thread Starter Member

    Jun 26, 2008
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    ok thanks, i already had the LM3914 so i was just wondering
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
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    I suppose that you could use it, but you would have to pre-process the input, perhaps using an opamp and associated components. It really would be more trouble than it's worth.

    Jameco.com has LM3916N/NOPB's available as 4-day dropship for $1.59 each. They don't have a minimum buy.

    Save yourself the hassle of trying to beat a square peg into a round hole. Unless, of course, you really want to tackle something like that, and don't mind spending lots of time fiddling with it.
     
  5. Audioguru

    New Member

    Dec 20, 2007
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    I designed a Sound Level Indicator project with an electret microphone, a preamp and an LM3915 driving two LEDs in series on each output. The LM3915 has a logarithmic detector like your hearing and I enhanced it 20dB with a simple compressor circuit when sounds get loud. So it is extremely sensitive and shows a pin dropped on the floor of the next room and also shows very loud sounds.

    An LM3914 is a voltmeter. It does a poor job measuring sound levels.
     
  6. cmsch180

    Thread Starter Member

    Jun 26, 2008
    12
    0
    ok thanks guys
     
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