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Don't Fence Me Out

Discussion in 'General Electronics Discussion' started by Anthony Guy, Dec 26, 2015.

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  1. Anthony Guy

    Anthony Guy

    Dec 26, 2015
    Hello, I'm not a true electronics geek, I've built kits and can generally follow a schematic, but I have limited knowledge of electronics. This past summer I had my strawberry patch raided by raccoons before I could
    harvest any. I'd like to build an electric fence to keep them out. I was wondering if I could use an old 12 volt car battery charger as a power source? I'm looking for a high voltage, low amperage transformer, and have no idea where to find one. I'm not sure if I'm on the right track as far as using this as a power source. That came to mind simply because you can find them cheap at garage sales, and if I ruin it, I won't feel bad. Any help that can be offered to point me in the right direction will be greatly appreciated.Thanks.
  2. AnalogKid


    Jun 10, 2015
    Mist fence chargers are based on a small switching power supply circuit called a flyback. This is the same topology as is used in cars to generate the spark plug voltage. A car battery charger will run one with a little help. The transformer you describe would be correct if you were running the fence directly off the power line, but that is a much more difficult path because that is not a common transformer.

    As for direction, turn toward ebay. Small fence chargers are under $30.

  3. GPG


    Sep 18, 2015
  4. hevans1944

    hevans1944 Hop - AC8NS

    Jun 21, 2012
    Please don't try to power your electric fence with a high-voltage, low-current transformer! This may work using a small neon-sign transformer, but it is very dangerous. Fence chargers produce a pulsed output whereas the transformer output is continuous. So instead, use a commercial fence charger as recommended by @GPG sized for pets (not horses or cattle!). You can power these with a solar-cell array and battery, but line-operated is better if you can locate the fence charger close to electric service. Since raccoons are nocturnal, you probably want to put the fence charger on a 24-hour mechanical timer so it only operates at night.

    Don't forget to shelter the fence charger from the weather. A little "house" mounted on posts a couple feet above grade will do.
    Tha fios agaibh likes this.
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