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"Zapper" circuit for electricity demo

Discussion in 'General Electronics' started by John Doe, Jan 13, 2004.

  1. John Doe

    John Doe Guest

    Hi,

    I'm considering buying/building a battery-powered "zapper" that will
    deliver a *mild* electric shock when the electrodes are touched. I'm
    *not* looking for a stunt gun. The intended us of the zapper is for
    teaching children about electricity (about electric shock, the danger of
    electrocution, & how electricity can travel through conductors). Safety
    is the no. 1 requirement. The "shock" should be no more painful than
    from a static discharge but should be continuous (unlike a zap from static).

    Does anyone have a schematic that uses easy to find parts (available
    from RS)?

    (I can imagine that someone will tell me the demo is a bad idea, but I
    can't think of a better way to help children understand electricity from
    a safety perspective than to let them experience first-hand a mild
    electric shock in a safe and controlled demo. If anyone has a better
    idea, I'd be interested.)

    Thanks.
     
  2. Baphomet

    Baphomet Guest

    You might try a Van De Graaf Electrostatic Generator
    http://www.angelfire.com/ak/egel/vande.html
     
  3. Baphomet

    Baphomet Guest

    ALERT! Please be advised that while this is a very interesting site, it
    introduces 3 - 5 spyware tracking cookies. Keep your anti-spyware signatures
    current and sweep after each visit.
     
  4. Chris

    Chris Guest

    If you're an educator, I hope you're getting parental consent first. Even
    though it's a mild charge, I'd hate to have some aggravated parent confront
    you afterwards.
     
  5. CWatters

    CWatters Guest

    WARNING - THE FOLLOWING MIGHT BE DANGEROUS - USE AT YOUR OWN RISK.

    I've seen a circuit that uses a 9V battery, a 9 VDC motor and a mains
    transformer (eg 110V Input 9V Output) . You connect the motor and battery in
    series with the secondary winding and the primary winding becomes the high
    voltage output.

    It works as follows: The commutator in the motor interrupts the DC current
    from the battery to make crude AC and the transformer (acting in reverse)
    steps it up to high (and possibly dangerous voltages).

    Warning - NO part of this circuit is, or should ever be, connected to the
    household mains supply.
     
  6. Bob Stephens

    Bob Stephens Guest

    Firstly, I wouldn't touch this idea with a ten foot pole, but you might
    consider using a buzzer to simulate the shock with vibration - a modified
    dildo?

    Bob
     
  7. You can use a buzzer that runs off 1 or 2 cells. It usually has a
    shocking voltage across the contacts when they open. You should put a
    resistor in series with the electrodes, to limit the current. I would
    guess a starting point would be a hundred k ohms in series with each
    electrode. But the shock depends on how moist the skin is, so it may be
    difficult to get a consistent level of 'tingle'.

    --
    @@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
    F
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  8. Do we use a broom to sweep, or what? ;-)


    --
    @@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
    F
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  9. When I was in school the usual demo invovled a
    war-surplus hand-cranked field telephone generator. Class
    held hands in a line, kids on the ends of the line touched
    the generator terminals.

    You will likely have a hard time finding such today, so
    consider mounting a good sized permanent-magnet DC motor to
    a board and adding a handcrank (may need some voltage
    multiplying to get it to the "feelable" level). That way you
    can teach about motors and why they make poor generators as
    well.

    And yeah, investigate the liability issue with
    administration.

    Mark L. Fergerson
     
  10. cpemma

    cpemma Guest

    The first shock I ever had was holding wires from an old steam radio choke
    onto a 1.5v cell and it was *NOT* a mild tingle.

    (it doesn't hurt a bit...till you let go)
     
  11. Baphomet

    Baphomet Guest

    Watson -

    I e-mailed the website contact but it bounced back. A 9mm. hollow point
    sweep might be in order.
     
  12. Active8

    Active8 Guest

    When I was in school the usual demo invovled a
    war-surplus hand-cranked field telephone generator.[/QUOTE]

    The army still had 'em 18 years ago. They were as effective for
    prisoner interrogation as they were for commo devices.
     
  13. Would a 357 magnum do? That's all I have...

    --
    @@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
  14. Baphomet

    Baphomet Guest

    More than adequate :)
     
  15. JeffM

    JeffM Guest

    ...a battery-powered "zapper" that will deliver a *mild* electric
    shock
    Previous thread about "Mystery Shock Box":
    http://groups.google.com/groups?hl=...afe=off&q=%22mystery+shock+box%22&sa=N&tab=wg

    MYSTERY SHOCK BOX

    sides 1 & 2 of box (tin can strips or foil)
    +....................................
    .. |
    .. __________|_ |
    .. | )|| |s
    .. | )|| |i
    .. | )|| |d
    .. | )|| |e
    .. | ___)|| |s
    .. | |______________________|
    .. | / |3
    .. | | |
    .. | \ very thin wire |&
    .. | \ |
    .. | \ |4
    .. | (|) plastic sleeve |
    .. | | (fits snuggly) |of
    .. ------- | |box
    .. --- | nail |
    .. | 1.5V | |
    .. | D cell | |
    .. | + painted portion |
    .. | + of nail |
    .. | + |
    .. |__________( + ) metallic "eye" |
    .. + |
    .. ===== |
    .. |
    .. __________________________________+

    As the box is lifted, the tiny wire allows the nail
    to drop out of the open bottom of the box.
    (The plastic collar is large enough to stop its travel.)
    The unpainted portion of the nail scrapes against the "eye",
    making and breaking the circuit.
    The magmetic field in the iron-core inductor
    is formed and collapses with each make/break cycle.
    As the field collapses, the resulting voltage
    is applied to the opposing metallic sides of the box
    causing a tingle to the person lifting it.
    When the box is returned to its upright resting position,
    the nail plunger is re-inserted, shutting off the current.
     
  16. You should've added: make the box out of a sturdy substance, because
    the holder is likely to drop it, or worse yet, throw it across the
    room. :p


    --
    @@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@,@@[email protected]@[email protected],@@[email protected]@[email protected]@[email protected]@
    ###Got a Question about ELECTRONICS? Check HERE First:###
    http://users.pandora.be/educypedia/electronics/databank.htm
    My email address is whitelisted. *All* email sent to it
    goes directly to the trash unless you add NOSPAM in the
    Subject: line with other stuff. alondra101 <at> hotmail.com
    Don't be ripped off by the big book dealers. Go to the URL
    that will give you a choice and save you money(up to half).
    http://www.everybookstore.com You'll be glad you did!
    Just when you thought you had all this figured out, the gov't
    changed it: http://physics.nist.gov/cuu/Units/binary.html
    @@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@[email protected]@[email protected]@@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@[email protected]@@
     
  17. I made some of those when I was a kid. The four sides were covered
    with aluminum foil, and the top was plainly marked, Do not touch! It was
    left on the desk in my bedroom, and sure enough, everyone who saw it
    picked it up, as they started to say, You can't EEEEEEEEEEEEEEEEEEEEEE!
    then dropped it.

    --
    We now return you to our normally scheduled programming.

    Take a look at this little cutie! ;-)
    http://home.earthlink.net/~mike.terrell/photos.html

    Michael A. Terrell
    Central Florida
     
  18. JeffM

    JeffM Guest

    make the box out of a sturdy substance
    Yup. 1st one was from the Electrical Lab kit
    (2.5" x 2.5" x 3.5", cardboard & foil).
    Subsequent builds were 1.5" x 3" x 3.5", wood & tin can strips.

    Placing it near the edge of the table == bad idea.
     
  19. Switch

    Switch Guest


    While connecting disconnects (temporary power to supply power distibution 3phase 208V, for
    rock concert amplifiers, dimmer racks, etc..), some technicians use a VoltCon (TM) to test
    if voltage is present before hooking up.

    Other technicians 'lick' their fingers on one hand, and using the index finger and the "f"
    finger, proceed to test the voltage across the terminals!!! (between phases, giving a
    potential of 208V in a 3phase distribution system). Yes, sometimes they find that the
    mains weren't turned off!! Ahhhhhhhhhh yeah. ok!! I wouldn't suggest that.

    Getting a shock in any circumstance sucks.


    Teaching about electricity and STATIC electricity would be more interesting, and usually,
    static electricity charge that we make while rubbing across a carpet, or rubbing Amber or
    what not, hey, I don't think there is much danger in it.
     
  20. dg

    dg Guest

    Not exactly what you are looking for, but those clicking cigarette lighters
    that use no flint contain a little gizmo that creates an electrical spark.
    They are mildly uncomfortable to get zapped by. I think they make a
    barbeque sparker very similar. Probably pretty safe, probably.

    --Dan
     
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