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Making a zapper? — Parallax Forums

Making a zapper?

MicrocontrolledMicrocontrolled Posts: 2,461
edited 2010-09-03 08:53 in General Discussion
I have recently seen a schematic that shows you how to make a perfect prank zapper out of about 5 parts from a disposible camera. Unfortunatly, I have no disposible camera to salvage the transformer from. Does anyone have some alternate schematics for something like this?

Thanks,
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Comments

  • mctriviamctrivia Posts: 3,772
    edited 2010-04-20 17:16
    The high voltage circuits I have I think are all prety lethal. You can wind your own 1:1000 transformer pretty easily. Have a micro toggle a relay or transister to run 5v into it. This would be safe if transformer is only a few raps on primary

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  • stamptrolstamptrol Posts: 1,731
    edited 2010-04-20 18:00
    Of all the possible things you could spend your time on, building a device to shock (former) friends is about the most useless one.

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  • MicrocontrolledMicrocontrolled Posts: 2,461
    edited 2010-04-20 18:07
    @stamptrol: Friends, BAD idea! Little brothers that get on your nerves, GOOD idea!
    Just kidding, I want this as a defense for my mini-robot.

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  • mctriviamctrivia Posts: 3,772
    edited 2010-04-20 19:59
    If your openent is metalic you can charge a 1.5kF cap and leave the pins exposed. Touch oponent and watch there case melt from the 1.8v running through it.

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  • mctriviamctrivia Posts: 3,772
    edited 2010-04-20 23:59
    2.7V 3kF Cap

    This cap will store 11kJ and can deliver a whopping 4800A to your metallic opponent.

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  • BradCBradC Posts: 2,601
    edited 2010-04-21 00:06
    mctrivia said...
    2.7V 3kF Cap

    This cap will store 11kJ and can deliver a whopping 4800A to your metallic opponent.

    Can't wait to see what the EMF from that does to the electronics in your bot!

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  • mctriviamctrivia Posts: 3,772
    edited 2010-04-21 00:38
    Hm would be good experiment. Now I want to try it but there shipping cost is to much.

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  • HollyMinkowskiHollyMinkowski Posts: 1,398
    edited 2010-04-21 00:50
    Maybe you could use a voltage multiplier circuit made of diodes and caps?
  • KMyersKMyers Posts: 433
    edited 2010-04-21 22:01
    You could try tickle stick from Ramsey Electronics....
  • mikedivmikediv Posts: 825
    edited 2010-04-22 00:35
    mctrivia how would you charge the cap??? I don't know if any of you follow the "Lifter threads" its made out of aluminum and foam and uses high voltage to defy gravity well not really but its very interesting the way the thing will lift off if you apply high voltage to it over 20K
    I tried to make one using a computer screen (19 inch Dell) old monitor for the high voltage .. No joke when I got up from the being knocked on my butt my left arm was numb for a few days . It was just to dangerous without schematics to know what I was doing
    but MC I would be really interested in circuit to use to charge the cap you posted about?
  • mctriviamctrivia Posts: 3,772
    edited 2010-04-22 01:11
    Charging the cap is super easy. Use a 2.7V voltage supply and a series resister to limit the current draw. the smaller the resister the faster it will charge.

    Cap Charge(:
    RC seconds: 63%
    2RC: 86%
    3RC: 95%
    4RC: 98%
    5RC: 99%

    0.1 ohm resistor gives an RC value of 300 and has a max current draw of 27A
    1.8 ohm resistor gives an RC value of 5400 and has a max current draw of 1.5A(mentioned supplies max)

    So a 1.8 ohm will take 7.5 hours to charge to 99%

    For faster charging you can use a constant current source with a set max voltage. I have not tried this but the LM317 used in the kit mentioned should keep the current at or below 1.5A so you should in theory be able to set the voltage to 2.7V then just hook it up and watch it charge to 100% in 4.5min

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  • Junk_BotJunk_Bot Posts: 15
    edited 2010-05-03 21:25
    I once saw a schematic for a "Friend Zapper" that used a switching voltage supply powers by a AAA to produce a few hundred volts.
    It was pretty interesting since instead of winding a coil they used the secondary of 1:1000 transformer.
    It seemed really creative.

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  • hinvhinv Posts: 1,255
    edited 2010-08-28 18:40
    I went to the local walmart and asked for their ripped open disposable cameras at the film developing station. The gave me over a dozen cameras free. Most of them had good batteries also.
  • localrogerlocalroger Posts: 3,452
    edited 2010-08-30 06:01
    It's not just the transformer you salvage from the disposable camera, it's the entire flash circuit. You remove the flash tube and capacitor (if you stupidly try to do this, absolutely remove the capacitor or you really might kill someone). The two wires that go to the xenon tube have about 300 VDC on them when the board is powered up. That will get someone's attention. It isn't likely to hurt someone (at least much, and if they are healthy) because the step-up supply won't push enough current to electrocute someone. (The flash capacitor WILL, if you leave it in circuit.)

    For informational purposes only, don't try this at home, not that I'd ever do such a thing. Actually I wouldn't do such a thing for the purpose of shocking soon to be ex friends but those little power supplies also work nicely for powering Nixie tubes.
  • Spiral_72Spiral_72 Posts: 791
    edited 2010-09-02 06:37
    I used to use a single AA battery connected to a transformer on the secondary side. The transformer was small and might have been 120V:7V or something like that. It worked pretty well :) and if you pulse the 1.5V it'll make people dance.

    I know "someone" that would charge high voltage caps (don't know the values) and leave them laying on floor in high traffic areas. " OH, what's this little blue thing on the floor, ZZZZzaP! AAAAH!"
  • UnknownUnknown
    edited 2010-09-02 15:11
    localroger wrote: »
    camera, it's the entire flash circuit. You remove the flash tube and capacitor (if you stupidly try to do this, absolutely remove the capacitor or you really might kill someone).

    All you need are two electrodes to the heart and one D battery which is enough to stop the heart said my Physics professor in College.
  • localrogerlocalroger Posts: 3,452
    edited 2010-09-03 05:48
    Chuckz, working from outside the body (macroshock) you generally need a minimum of 40 volts or so to push enough current through the body's normal skin and tissue resistance to cause a problem with the heart, and that assumes perfect electrode placement, really good skin conductivity, and a voltage source capable of pushing at least 20 or 30 milliamps. The D battery could work if you actually stick needles through your chest to get the electricity directly to your heart, but most people don't go to that much trouble.

    In general it's the voltage that hurts but the current that kills. Low voltage sources are generally considered safe for skin contact because normal skin resistance will not draw enough current from them to do damage. This is not the case if you open the body up and stick the electrodes directly to the heart muscle though, obviously.

    The reason the flash power supply is fairly safe is that no matter how low your skin resistance is, it can't push enough current to kill a healthy person; if the resistance is low enough to draw that much current, the voltage will fall instead. The reason it's dangerous to leave the capacitor on is that it will push enough current to hurt you.
  • Peter KG6LSEPeter KG6LSE Posts: 1,383
    edited 2010-09-03 08:53
    Not that it makes it any safer but IF you were to grab that Flash cap and it went accros your hand like (finger to palm ) . there is VERY little chance of death from shock .Why?
    Its cause the current is local . its 1CM from pin to pin .
    as for a zapper for a robot.

    2kJ
    nix the zapper . use a coil gun LOLs
    ( that cap bank is for a 2kJ gun I made .

    for MAD ( mutability assured destruction ) Venom would stop any robot (or grage door opener :) )
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