Re: Electric fences
- From: "Paul Hovnanian P.E." <paul@xxxxxxxxxxxxx>
- Date: Thu, 23 Aug 2007 16:08:43 -0700
Martin Griffith wrote:
On Thu, 23 Aug 2007 20:33:17 GMT, in sci.electronics.design "Alan
Beamish" <alan.beamish@xxxxxxxxxx> wrote:
I'm about to get some chickens and was thinking that an electric fence might
help to deter foxes. Does anybody know how the fence energisers work ? I
thought I might try experimenting with an old ignition coil and relay to
open and close the primary coil but I imagine that the primary current would
be high. Any thoughts will be gratefully received.
Thanks,
Alan
Hugh Fearnley-Whittingstall is an advocate of the ladder system. The
hen house is raised on an old telegraph pole, or similar stout
support, to a height of about two metres. Access to the hen house is
via a ladder, made by knocking simple steps into a long, stout pole.
The design of the ladder is deliberately crude and rickety: a chicken
will be able to use it, but a fox will not.
Martin
One could make such a ladder from a pole mounted in a bearing at either
end and balanced so that the weight of a chicken will not cause it to
rotate but that of a fox will. If a fox tries to climb it, it just rolls
180°.
--
Paul Hovnanian mailto:Paul@xxxxxxxxxxxxx
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