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From: N_Cook on 10 Jul 2010 10:42
Ian French <ianf(a)dsl.pipex.com> wrote in message
news:58Sdnfy4nt1N9qXRnZ2dnUVZ8gGdnZ2d(a)pipex.net...
>
> "N_Cook" <diverse(a)tcp.co.uk> wrote in message
> news:i120g0$ofq$1(a)news.eternal-september.org...
> >2 stage derivation of (should be) 1800V pulses.
> > Fence had failure in the first stage probably due to intermittant
corroded
> > battery supply contact.
> > Anyway the 15A 60V 8N06 powerFET blew along with an associated double
> > diode
> > BAV23.
> > Replaced both and works to some extent. This FET has plenty of drive 5V
of
> > pulses of repeat 3uS for the gate and about 3V ringing swing on the
output
> > to the first step up transformer. I assume that is as to be expected,
> > never
> > having the chance to see hot-side SMPS drive scope traces.
> > But rectified output only climbs to about 1V of DC before the final
stage
> > (unreadable marking) thyristor discharges that supply into the second
step
> > up transformer, but of course not even enough to get a glow on a 110V
> > neon.
> > Doubling the C setting the 3uS pulses, to give longer repeat rate and
that
> > intermediary voltage rises to about 3V but still not enough for any
proper
> > final output. Adding more C and DC is then much less than 3V.
> > What would people expect the intermediary DC to be? obviously higher
than
> > 12V battery supply
> > Next stage would be disconnect the thyristor if that should be working
but
> > leaky and draining the intermediary DC but any other ideas? Would
explain
> > why the printing is very indistinct I suppose.
> > DC ohms of the airgap type transformers are
> > intermediary 0.1R//10.6R
> > HV 0.3R//29R which seem reasonable, ie not major shorted turns if any
> >
> >
>
> Hi,
>
> I found this schematic (circuit diagram) somewhere on the net, is it
> anything like your one ?
>
>
http://www.electro-tech-online.com/attachments/electronic-projects-design-id
eas-reviews/4007d1108193301-need-help-developing-electric-fencing-my-farm-el
ectricfence.jpg
>
> Ian.
>
>


The 'IV' and HV stage is very similar, this one has a lot of SM so a bit
more distributed for the higher voltages, ie tripling up of diodes and Rs

Do you have the URL of the text relating to that pic
Search on that site just enigmatically/awkwardly/insultingly returns
"The answer given for the random question was incorrect."




From: N_Cook on 10 Jul 2010 10:45
Googled for it
http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/
13848-need-help-developing-electric-fencing-my-farm.html




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