Re: sec coil zap ouch! - Possible fix...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:

>Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

>Hi,

>I wonder if spraying a coil with a consumer anti-static spray like "Static 
>Guard" would stop this without hurting the coil's operation.


>It is a pretty high resistance

         ...and coils make pretty high voltage...
         8)>>

         Static sprays work by being conductive.  I'd be
         reluctant to try it.  If someone ELSE wants to ....
         8)>>

>and perhaps

         ...perhaps...
         8)>>
         (Measuring resistance of such things is tricky.)

>would not arc over under TC voltages and frequencies but

>would help short out this nasty electret effect that keeps

>zapping us all the time.
         Seems to get some more than others, and be handlable

         with some basic procedures...  ??


>It says it contains "Dimethyl Ditallow Ammonium Chloride" as if that tells 
>me anything 0:-)

>I am not sure it is easy to get off or if it would destroy a coil if it 
>did not work.  Maybe a good use for a shipping wrapped secondary test 
>where one could just pull off the wrap to remove the stuff if it was 
>"bad".  Maybe a neat experiment if anyone has an old "extra" secondary 
>that likes to zap you and you could live without if it hurts the coil.
>If Static Guard could get rid of the shocks but the coil still runs fine 
>it would be a big deal ;-)


         Pondering this today, it occurred to me that is anyone
         had an extra form lying about, to try and see if THAT
         would take/hold a charge.
         Then try differing materials...
         The comment in another post re epoxy patch 'holding'
         a charge is interesting.  While it may more or less
         set in '5 minutes', I'd guess it may take longer than
         that to _fully_ cure.  It may be that, if the patched
         coil was powered 'soon', while (maybe) the epoxy was
         Not Quite Cured, it may have added to its charge holding
         ability.
         (on the other hand there are a LOT of maybes in that
         sentence.  8)>>)

         If those who get zapped were to list out there coil form
         materials (and those who do not), might be instructive..

==============================================
>>On the subject of the electret effect, and getting zapped by secondaries...
>>
>>I patched up a damaged secondary, which had gotten knocked around and had 
>>its finish chipped.  The secondary had been
>>originally potted with phenolic varnish.  The spot repairs were made with 
>>5 minute epoxy (I was impatient! :)  I quicky
>>learned that the epoxied spots have a great propensity to zap.  After 
>>operation, running ones finger down the length of
>>the secondary invites a mild, crackly tingle; but touching one of the 
>>epoxy patches...yeouch!


-- 
         best
         dwp

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         Vernor Vinge
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         -me