http://www.howstuffworks.com/pet-fence1.htm
Rick

Mias Van Vuuren wrote:

> Hello everybody
>
> I have been looking all over for the principle of these fences that keep
> pets out of the garden, but did not find anything. It works on around 10 kHz
> and has a hidden (buried) transmitter which signals the boundaries. The dog
> gets a collar that gives him firstly an audible warning, and then it gives
> him an electric shock when he gets too close to this bounary. Does anybody
> know how this system works, and where I can get hold of circuitry for this?
>
> Thanks
>
> Mias van Vuuren
>
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