audio controlled led chaser

Discussion in 'The Projects Forum' started by animee, Feb 23, 2014.

  1. animee

    Thread Starter New Member

    Feb 23, 2014
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    i found this schematic for an audio controlled led chaser. can you please tell me if it's correct or not because i made it and it isn't working as of yet. please help!!
     
  2. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    It would be a lot easier to use a LM3914.
     
  3. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,500
    380
    Hi,
    If you disconnect pin #5 of the 555, you should have a free running Astable, around 10Hz, the 4017 should count and drive the LED's in sequence... try that and let us know what you see.?
    E
     
  4. animee

    Thread Starter New Member

    Feb 23, 2014
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    the circuit isn't working. i have checked every component and every connection according to the circuit and it doesn't even power up.:mad: only way i can get the leds light up is by hooking them up directly to the power source and interestingly they are running in sequence which i can control the speed of with the 47k pot.:confused: i unhooked #5 of the 555 and it didn't make a difference. the circuit is still dead. any modifications needed? please help.:)
     
  5. animee

    Thread Starter New Member

    Feb 23, 2014
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    @bountyhunter
    would you be so kind to provide me with a working schematic with 3914 that can be controlled by audio input through a mic? any help is appreciated!! :)
     
  6. bountyhunter

    Well-Known Member

    Sep 7, 2009
    2,498
    507
    The 3914 would replace the 555/4017. The 3914 data sheet shows how to hook it up. You would take the signal off the peak detector which is to the right end of the 1N4007..

    I honestly don't see how your circuit can work. The 741 op amp has it's inputs referenced to ground but it has no negative supply so the inputs are out of the common mode range. I doubt it can work as drawn.
     
  7. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
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    Where did you find it? Post a link to it.
     
  8. animee

    Thread Starter New Member

    Feb 23, 2014
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    0
  9. animee

    Thread Starter New Member

    Feb 23, 2014
    5
    0
    @bountyhunter
    i am a novice at this stuff. would you provide me with a schematic? even a hand drawn one would work!! :)
    thank you!!
     
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