Olin Lathrop wrote:
>So far OK, but why doesn't the circuit try to hold the
>spike amplitude (or some measure of "feelability") constant instead of its
>power into the fence?  Why isn't the power per pulse only whatever is
>required to overcome the leakage?  For the same effect per pulse, wouldn't=
 a
>long fence on a damp day require more power than a short one on a dry day?
>What am I missing here?

Nothing! :) =20

Well, cost issues as usual...
 There are cheap units that pulse about 1J (if not open cirquit, then an=
 internal spike gap fires) every shot, then there are those advanced units=
 that senses the result and adopt, sending up to 20J in each pulse!  And=
 everything in between.  There are also those nasty continuous AC types...

This 6J charge unit seem to be the largest nonadopting electric fence drive=
 i=B4ve seen.
In the 9 Joule adopting unit i repaired earlier i could se cirquitry for the=
 controller to measure utput spike level.  On this unit i can=B4t indentify=
 such cirquit, but some componets in th etransformer drive stage that only=
 connect to 3 auxillary pins not used in this unit, but maybe get used in an=
 advanced sister unit.

Some info: http://www.electric-fence.com/gloss2.html

/Morgan

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