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Ideas For Delayed Bright Spark / Pop Sound Static Gap Capacitor

Discussion in 'General Electronics Discussion' started by abk111, Jun 1, 2014.

  1. abk111

    abk111

    26
    1
    Dec 13, 2010
    Need to make a circuit to set off a bright spark and loud pop sound when a motion detector is activated.
    The MD has about 80 watts to spare on its relay, but could always use that to trigger a separate relay.
    Only need a bright spark / pop sound once every 30 to 90 seconds or so.

    Would slow charging the capacitor be the simplest way to get this.
    And then have the capacitor discharge on a couple points at a fixed distance once a capacitor is charged?
    Or its there a better way to do this?

    Trying to make this because deer have been destroying my garden and fruit trees, and the light alone from the motion detector is not enough to scare them off.
    Thanks
     
  2. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
    You will find here under a circuit based on a capacitor discharge to simulate a starting pistol.
    The circuit is however not for beginner as high voltage is involved. If you don't have the required skills or if you can't hire them please DON'T build it !
    Another approach can to record the loud sound in a small sound player module connected to an amplifier.
    Take care that it may happen that audio amplifier's trig they protection with such sounds.
    Olivier

    upload_2014-6-1_20-11-11.png
     
  3. abk111

    abk111

    26
    1
    Dec 13, 2010
    Thanks Olivier,
    That is on the right track, but more elaborate than I hoped.
    Was thinking the spark itself could produce a loud enough pop.
    Involve rectify AC to DC, a slow charging of a large capacitor,,,??
    Any other ideas?
    Thanks
     
  4. OLIVE2222

    OLIVE2222

    690
    25
    Oct 2, 2011
  5. duke37

    duke37

    5,248
    723
    Jan 9, 2011
    The normal way to deter deer is by an electric fence.
    A spark will produce little light, a discharge tube is much better.
    Any rapid voltage change can be fed to an audio amplifier to produce a crack.
     
  6. abk111

    abk111

    26
    1
    Dec 13, 2010
    Thanks duke37,
    I was trying to find a simple way to replicate something like a small firecracker. Not too loud (would bother people) or bright. A flash too bright might actually cycle the MD into a loop; but was hoping the static discharge would not.

    Was trying to avoid setting up an audio amplifier, but maybe a player module / audio amplifier is the way to go.

    And was trying to avoid fencing because of the cost and maintenance / obstacle hassle.
     
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