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Electric fence - badgers

Discussion in 'Electronic Repair' started by Roy Hammond, Oct 17, 2004.

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  1. Roy Hammond

    Roy Hammond Guest

    Anybody any design ideas for a high-voltage generator for an electric fence
    to deter (not kill - that's illegal in the UK) badgers from entering my
    garden and digging up the lawns?

    I've toyed with adapting either a boiler/gas oven ignition system or a car
    ignition system ...? But I'm lost as to determining what would be safe and
    how to measure the voltage (kV), current (mA) and energy (Joules) available.

    Any ideas or experience welcome...
    -Roy-
    (Surrey, England)
     
  2. NSM

    NSM Guest

    | Anybody any design ideas for a high-voltage generator for an electric
    fence
    | to deter (not kill - that's illegal in the UK) badgers from entering my
    | garden and digging up the lawns?
    |
    | I've toyed with adapting either a boiler/gas oven ignition system or a car
    | ignition system ...? But I'm lost as to determining what would be safe and
    | how to measure the voltage (kV), current (mA) and energy (Joules)
    available.

    Try a Kemo Ion Generator kit. That'll be safe enough - you don't want some
    kiddie getting zapped. Or how about flashing strobe lights when they cross a
    light beam?

    N
     
  3. Chuck Harris

    Chuck Harris Guest

    Last I checked, farming existed in all of the parts
    of the UK, why not just buy a small fence charger?

    They can be had for $50USD or so for a cheapy that will
    easily do the job.

    -Chuck Harris
     
  4. Dave M.

    Dave M. Guest

    I once fixed a couple of them. They are a HV low current autotransformer. An
    SRC is fired by way of the gate by a neon lamp, the other side of which is
    connected to the AC line to drive the transformer primary. One was an AGWAY.

    Dave M.
     
  5. Dave M.

    Dave M. Guest

    That's "SCR"

    Dave M.
     
  6. We use a fence charger to provide perimeter protection for our chicken
    coop and have found a few sets of blackened paw prints in the morning.
    It deters racoons and skunk with no problem. It also knocked me down
    when I accidentally touched it. I put 3 rows of wires, one a few inches
    off the ground to deter things that can dig, one up about 12 inches and
    one up about 24 inches.
     
  7. Chuck Harris

    Chuck Harris Guest

    Blackened? Be serious! If your fence charge can blacken anything, it is
    seriously out of whack. They will kill weeds that are in contact with the
    wire, but it takes hours of continuous contact to do this.
    When my son asked about whether or not the electric fence was dangerous,
    I told him to grab it and and he would see that it wasn't. He did, and
    twitched a couple of times as the pulse went by, and then got bored and
    let go. He decided that it wasn't all that bad.

    You seem to have a tendency to exaggerate.

    -Chuck Harris
     
  8. I've never found blackened footprints, that was a joke.
    It never knocked me down that was a figure of speech.
    You seem to have a tendency to take things literally...
     
  9. Chuck Harris

    Chuck Harris Guest

    Hi Mark,

    Well, how else can I take what you write? There are
    no smiley's to indicate an attempt at humor. Your words
    said that you found blackened paw prints. I know that
    blackened paw prints aren't a possible outcome of touching
    an electrified farm fence, but then I live on a farm.
    Some city folk who don't know any better will probably
    take your words literally.... and the next thing you know,
    all farmers will have to register their electric fences
    with the local police ;-)

    -Chuck Harris
     
  10. Roy Hammond

    Roy Hammond Guest

    Flashing lights don't work for badgers - I've tried!
     
  11. Roy Hammond

    Roy Hammond Guest

    I like the simple approach - neon, SCR and transformer. But what transformer
    would be sufficient but also safe?
    Such electric fences are available here in the UK but unfortunately not for
    the equivalent of $50 - more like $150!
     
  12. Chuck Harris

    Chuck Harris Guest

    I could go to the local farm supply, and mail you one for
    less than $150! The only rub would be ours run on 120V, though
    you can also get solar powered and battery powered fence chargers.

    The usual fence charger puts out a pulse every second. The voltage is
    probably 10Kv, judging by how far it arcs. The current is very tiny.

    Back in the days of yore, the charger was a car ignition coil, and
    the pulse timer was a pendulum. The power source was a battery. If
    I were going to make one, I would use an old car ignition coil, and
    a CMOS 555 timer to key an HV FET. A 6V lantern battery would easily last
    a whole season.

    -Chuck Harris
     
  13. NSM

    NSM Guest

    | I like the simple approach - neon, SCR and transformer. But what
    transformer
    | would be sufficient but also safe?

    A flyback transformer out of a junked TV. Run it off 6 VDC - it'll be safer
    than 230. Look on the web for tesla coil designs.

    N
     
  14. NSM

    NSM Guest

    | Mark Leininger wrote:
    | > We use a fence charger to provide perimeter protection for our chicken
    | > coop and have found a few sets of blackened paw prints in the morning.
    |
    | Blackened? Be serious! If your fence charge can blacken anything, it is
    | seriously out of whack. They will kill weeds that are in contact with the
    | wire, but it takes hours of continuous contact to do this.

    Avoid pissing on it in that case!

    N
     
  15. Chuck Harris

    Chuck Harris Guest

    A car ignition coil has the advantage of being hermetically sealed.

    -Chuck
     
  16. NSM

    NSM Guest

    | NSM wrote:
    | > | > | I like the simple approach - neon, SCR and transformer. But what
    | > transformer
    | > | would be sufficient but also safe?
    | >
    | > A flyback transformer out of a junked TV. Run it off 6 VDC - it'll be
    safer
    | > than 230. Look on the web for tesla coil designs.
    |
    | A car ignition coil has the advantage of being hermetically sealed.

    They will give you a jolt though. Use a length of spark suppressor lead to
    limit the current somewhat. One of my primary school teachers had the whole
    class join hands then one kid touched the car's ground and another a spark
    plug. Felt like someone shoved a broom handle through my arms.

    N
     
  17. Graham

    Graham Guest

    One of my primary school teachers had the whole

    You mean in the States, Teachers can still do that stuff?

    Here in the UK they get accused of child abuse for putting a Band-Aid on a
    cut!

    I have memories of being wired to Wimsurst and Van-de-Graff machines by my
    sadistic Science teacher.

    Happy days.

    Graham.

    %Profound_observation%
     
  18. NSM

    NSM Guest

    | One of my primary school teachers had the whole
    | > class join hands then one kid touched the car's ground and another a
    spark
    | > plug. Felt like someone shoved a broom handle through my arms.
    |
    | You mean in the States, Teachers can still do that stuff?

    In New Zealand in 1950.

    | Here in the UK they get accused of child abuse for putting a Band-Aid on a
    | cut!
    |
    | I have memories of being wired to Wimsurst and Van-de-Graff machines by my
    | sadistic Science teacher.

    Times change.

    N
     
  19. Art

    Art Guest

    Straight on,Gov!! Used to have the "city cousins" do that to teach them the
    ins and outs of farming!! BTW that was before we pointed them to that stack
    behind the barn where all the "Magic Mushrooms" grew. I can't tell you how
    many times the came tracing back into my dad's home with the aroma and
    evidence of delving into the old "Poop Pile" in search of a fungi that will
    produce mind altering effects!! Needless to say, the appropriate
    application of corrective actions by their respective parents proved to be
    more mind altering that the mushrooms they actually found. LOL <<
     
  20. Roy Hammond

    Roy Hammond Guest

    Thanks guys. Food for thought - and action! Will let you know what happens!
    -Roy-
    (Surrey, England)
     
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