Re: Strange shock (fwd)

["Daniel Boughton" <daniel_boughton-at-yahoo-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Greetings:

I too have seen this effect with coils that either
have heavy varnish or heavy insulation on the
windings. The static charge comes from the last half
of the charging cycle in the primary circuit. It is
esentially varying +DC or -DC (varying sinusoidally
and changes polarity when it drops to 0 Volts).
Distributed capacitance between the windings holds the
charge until a larger capacitance (human touch)causes
an inrush of current (shock) to estanblish
equilibrium.

Dan Boughton 
--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Chip Atkinson" <chip-at-pupman-dot-com> 
> 
> Date: Mon, 10 Jul 2000 19:15:32 -0700
> From: Ed Phillips <evp-at-pacbell-dot-net>
> Reply-To: ed-at-alumni.caltech.edu
> To: Tesla list <tesla-at-pupman-dot-com>
> Subject: Re: Strange shock
> 
> Anyhow, after the show was over I proceeded to
> > dismantle the coil as I have done a hundred times.
>  I removed the secondary
> > after disconnecting all the wiring and capacitors.
>  I received a small
> > shock from the secondary while holding it in my
> hands, away from everything
> > and totally disconnected.  One of my engineer
> friends didn't believe me so
> > he picked it up and got the same shock.  It is
> built on a 4". thin wall PVC
> > drain pipe, sealed, and has 1/4x20 bolts epoxyed
> in each end.  The larger
> > of the two shocks I got was from the bottom bolt. 
> The bottom of the
> > winding is connected to the bottom bolt for
> grounding.  The top bolt is
> > used to connect the toroid and doesn't have a
> connection to the
> > windings.  Any thoughts on why there would be some
> charge built up in the
> > secondary?  Either way, it didn't hurt and I
> didn't die, but I sure would
> > like to know what it was all about.  I am not too
> familiar with Leyden
> > Jars, but Steve the engineer had some ideas about
> the possible cause.
> 
> 	Anyone who has fooled with a coil (at least one
> with some form of
> varnish over the secondary) much  has observed
> similar effects. It is
> clear that there is residual charge in the varnish,
> which in turn
> implies that there must have been some rectification
> involved. 
> Well-known phenomenon, explanations less well known.
>  I've gotten almost
> painful shocks from a small 3" diameter coil coated
> with several layers
> of shellac.
> 
> Ed
> 
> 
> 


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