On Wed, 31 Dec 2008 08:26:59 -0000, "N_Cook" put
finger to keyboard and composed:

Back working with proper bridged repair, new neons etc . I'm asuming 8KV (it
is actually mentioned on the label) , at least it fires a neon via 100M ,
(0.1G ) dropper, I will dig out EHT divider today. The casing screws mayvbe
UNC which may indicate USA but label has UK address. Electric Shepherd
printed on the PCBs

FWIW the following device has an open output voltage of 8kV.

Electric Shepherd ESB25 Battery Fence Energiser:
http://www.rutland-electric-fencing....chTe xt=esb25

I have an electric fence controller kit that works by charging a 7uF
"dump" capacitor to 340V and then discharging it into the primary of
the HV transformer. The energy stored by the cap is ...

E = 0.5 x C x V x V = 0.40J

Its output voltage peaks at 3.6kV.

The ESB25 is spec'ed at 0.08 Joules, so perhaps you can work out the
required capacitor voltage (= transformer primary voltage) as follows:

V = sqrt( 0.08 x 2 / C)

Assuming V = 110V, then C = 13uF.

What is the rated DC voltage of your dump capacitor, assuming yours is
a similar design?

- Franc Zabkar
--
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