40-50 db wide SPL meter

Discussion in 'The Projects Forum' started by RogueRose, Mar 25, 2016.

  1. RogueRose

    Thread Starter Member

    Oct 10, 2014
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    4
    I need to record sound levels which usually range from 70-100db but could get up to 110. The sound is fairly constant and continuously varies in this range. I need to be able to record the meter levels some how. If the sound levels go beyond the 70-100db range and I had to choose one side of the spectrum to focus on, it would be the 100-110 range as the higher levels are more important to record. So, even though maybe 1% (or less) may be above 100db, it may be the most important data collected.

    (I actually only need 2-3 devices capable of higher db ranges of 110db)

    I have seen a number of meters and schematics that record 70-120 but they have a selector knob with 10db increments. This won't work when doing continuous auto-sensing/recording.

    As for recording, I think taking a measurement of 1-4 times a second would be ideal if possible.

    I'm trying to find out if these meters can be made as, ideally, I would need 5 to do the proper research I need for this project.

    Does anyone know if it is possible to make a meter that will have the range needed and what is the best method for recording the data from something like this?
     
    Last edited: Mar 25, 2016
  2. Externet

    AAC Fanatic!

    Nov 29, 2005
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    Check applications that run on smart phones... Seen that before.
     
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  3. dannyf

    Well-Known Member

    Sep 13, 2015
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    Ad8307
     
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  4. ronv

    AAC Fanatic!

    Nov 12, 2008
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    It all depends on the accuracy you need.
    Foe example if you use a regular electret mic it will have an output of about 2.6 mv at 70 and 825 at 120 so you can see the resolution on 1 scale won't be so good.
    In other words 70 db with a gain of 5 will be about 13 mv while at 70 db about 23 mv. 100db 415mv 105, 735mv.
    Can you use numbers like that?
     
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  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    Not clear - are you recording the audio, or are you recording the audio's SPL value? Also, analog or digital recorder?

    ak
     
  6. RogueRose

    Thread Starter Member

    Oct 10, 2014
    189
    4
    I'm recording SPL level. I'm not sure whether digital or analog would be better, I just need something that shows average sound level every second or like 2x a second. It's basically showing the "loudness" at a site.
     
  7. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    It sounds like what you want is a calibrated, autoranging SPL meter with a digital output, maybe a serial port or USB port, and a flash drive recorder.
     
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