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Sound Level Meter

Discussion in 'General Electronics Discussion' started by harsha_oak, Mar 15, 2014.

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  1. harsha_oak


    Mar 15, 2014

    I,m helping a couple of school students in doing their high school project

    I need a sound level meter which can give output in terms of voltage based on the ambient sound. I found this circuit in the URL mentioned below. I've built the circuit but not getting any output irrespective of the change in ambient sound.

    Can you help me in clarifying as to why it is not functioning or are there any circuits available for this purpose.
  2. davenn

    davenn Moderator

    Sep 5, 2009
    hi there
    welcome to the forums :)

    well it mite be a really good idea for you to show us some pics of your construction
    Maybe we mite see some wiring faults you have made ??

  3. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    You may need a capacitor and bleed resistor on the output. If the sound changes quickly then the voltmeter might not be fast enough to capture it.
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
    That circuit should work OK. Post some photos of your construction.

    What kind of microphone did you use? You need an electret type - a small cylindrical thing with a hole in one end and two solder connections at the other, one of which is connected to the metal part. This is the negative side and needs to be connected to the 0V rail of the circuit.
  5. harsha_oak


    Mar 15, 2014
    thanks all guys. i was able to contact the researcher who built the circuit who suggested a few changes. Will implement these and keep you guys posted on the progress.
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