decade counter sound bar graph

Discussion in 'General Electronics Chat' started by redacejr, Apr 22, 2009.

  1. redacejr

    Thread Starter Active Member

    Apr 22, 2008
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    0
    ok


    reversing the lm386 op-amp by ataching a microphone instead of the speaker and a few diode and pot modifications you CAN reverse its function to control resistance.


    now my question is.... can you turn that resistance into a bar graph led arrey?


    i think a 4017 ic is good for the job..... but i dont want that 9 off, 1 on led...


    i want them to always increase in number


    soo if the sound is moderate there are 4/5 leds on and if the sound is high there are 9 leds on
     
  2. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,346
    Hello,

    I think that will not work.
    A 4017 is a counter and not a volt (or resistance) meter.
    A LM3914 / LM3915 will do the job as a VU meter.
    Take a look at the datasheets:

    Greetings,
    Bertus
     
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