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Electric fence

Discussion in 'Hobby Electronics' started by Thomas McMechan, Nov 3, 2003.

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  1. I'm planning to build 3 small electric fence around my orange tree to
    stop possums 'stealing' them.

    Planning to build it with a stardard 12V ignition coil. Just wondering
    if i can power it with a computer power supply? If so how safe will it
    be(apart from moisture and weather issues)? Thanks!
  2. Unbeliever

    Unbeliever Guest

    Be careful! Having seen the effects on a friend of improper contact with
    electric fence, these things can be dangerous particularly to those with
    weak hearts (and bladders). You'd be better off buying an off the shelf
    one, or a kit that someone's put a bit of engineering effort into. Silicon
    chip had a project last millennium doing exactly what you're proposing
    (though I don't think they used a computer power supply). This guy sells a
    kit for $20:

    A double insulated plug pack might be a better choice than a computer power
    supply. Some power supplies bring 240V to the on/off switch which is
    dangerous. The fact that computer power supplies are unsealed is likely to
    make them inherently less reliable as is the fact that they need a fan to
    keep operating. A lot of computer supplies need a substantial load on the
    +5V line before you can draw a current from the 12V line.

  3. smithxpj

    smithxpj Guest

    The models based on a car ignition coils usually finish up being a bit
    more tame than commercial electric fence controllers. The high
    impedance of the coil means that it doesn't take much circuit
    resistance between the coil and the 'zappee' to weaken the jolt. Ideal
    for a one-off protection of an item against animals.

    Commercial controllers have a much lower output impedance, intended
    for driving longer fence runs and generally pack a heftier zap. A
    commercial controller is no less a problem for people with weak hearts
    than ignition coil versions and, no doubt, the reason why the clear
    presence of warning signs on, say, farm properties near to public
    access is a legislative must-have.
  4. Brian

    Brian Guest

    All electric fences, no matter where used, must meet the appropriate
    Otherwise you could be liable for any damage caused by the unit and any
    insurance cover for that area would become invalid.
    You would be far better off buying a commercial unit. Try any rural/farm
    store or Bunnings.
  5. Rod Speed

    Rod Speed Guest

    Its MUCH more likely that it just wont work very well.
  6. Franc Zabkar

    Franc Zabkar Guest

    Nope, he's right.

    An electric fence energizer is a "declared article" and must meet the
    standard for "electric fence energizers", namely AS/NZS 3129.

    - Franc Zabkar
  7. my deterrant keeps the little buggars out of my apple trees all's
    called a DOG
  8. Rod Speed

    Rod Speed Guest

    Wrong with one you are making for yourself and not selling.
    ONLY if you're flogging them, stupid.

    Just like any other plugin device in anywhere except Qld.
  9. Franc Zabkar

    Franc Zabkar Guest

    Bullshit, stupid. A fence is not a private construction, stupid. A
    fence, by definition, separates a person's property from his
    neighbour, or from the general public, stupid. And whenever others are
    involved, there is a potential liability, stupid. Even the Silicon
    Chip kit that Dick Smith sell is advertised to comply with AS/NZS
    3129, stupid.
    WRONG, stupid.
    Every state has a Dividing Fences Act, stupid. At the very least, a
    property owner would be bound to consult his neighbour as to the
    suitability of any fence, energised or otherwise, stupid.

    - Franc Zabkar
  10. Look again, it's been taken off their lists. Only find I could come up with
    is a jaycar pre-built module that is rather low power and they claim designed
    only for vegie patches.

    And while you're there, assurance a design complies with any australian
    standard is meaningless unless each and every device is tested to that
    standard. When you're talking about end-user-built units, all bets are off.
    Right stupid. That and, they technically don't have to comply with any
    australian standards (unless you claim it does) but DO have to comply with the
    C-Tick interference emmissions limits for that type of device. And then only if
    they're being sold.

    You're allowed to hand out for free any device that doesn't comply with any
    australian standards or c-tick standards, or hand out for free any plans for
    such devices.

    It doesn't indemnify you from any legal action should your box kill or injure
    anyone, but otherwise, you can hand it out freely.
  11. Rod Speed

    Rod Speed Guest

    Some pathetic excuse for a bullshit artist/completely
    unemployable fuckwit wogboy claiming to be
    Wrong. As always. Particularly an internal fence.

    And even someone as stupid as you should be able to
    grasp that what Thomas was asking about certainly is,
    if you took your head out of your wog arse for a moment.
    Wrong. As always. Most obviously
    with an an internal fence, fuckwit.

    And even someone as stupid as you should be able to
    grasp that what Thomas was asking about certainly is,
    if you took your head out of your wog arse for a moment.
    Even someone as stupid as you should be able to
    grasp that what Thomas was asking about aint, if
    you took your head out of your wog arse for a moment.
    Completely and utterly irrelevant when there is no
    legal requirement to comply with that, fuckwit.
    RIGHT, fuckwit.
    Pity Thomas didnt even ask about a dividing fence, fuckwit.
    Thomas doesnt have to ask any neighbour what so
    ever about what he chooses to have around his orange
    tree to keep the possums out of it, fuckwit wogfool.

    No wonder you're completely unemployable. Cant
    even manage to get even the simplest stuff right.
  12. Thanks for all the replys.
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