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Re: Unexpected Shock From TC




Is it possible to be injured by static, or can I freely zap myself since
I'm too lazy to touch a ground wire to my secondary?


At 12:17 PM 5/5/99 -0600, you wrote:
>Original Poster: Terry Fritz <twftesla-at-uswest-dot-net>
>
>At 01:27 AM 5/5/99 -0500, you wrote:
>>
>>
>>
>>To Bill Langston, and all coilers:
>>
>>	I noticed in your post that you (Bill) wrote that you got a shock by
>>touching the TC long after it was turned off.  I know of two reasons why
>>this might happens, and how to fix each of them.
>>	One cause is that the tank capacitor can hold quite a charge after the
>>coil is shut off.  It usually bleeds off through the circuit after a few
>>seconds, maximum.  However, according to Terry Fritz, if some connection
>>in the circuit is disconnected, this bleeding off may not happen.  Ask
>>around for ideas about bleeder resistors across the tank capacitor, and
>>other ways to fix this.  
>>	More likely, though, is that the secondary can hold a charge, too.  I'm
>>not sure if it has to do with the self capacitance of the coil, or the
>>varnish on it, or what.  However, I know that most big coils I have seen
>>could give quite a zap if you touched the secondary, even several minutes
>>after operation.  Usually, the operator would take a grounded wire and
>>touching it to the secondary to remedy this.
>>
>>	Again, just thoughts of mine.
>>
>>
>>
>>							Brent
>
>Coils that have thick coat of varnish can store pretty powerful static
>charges on the varnish.  Coils can charge this dielectric layer to
>extremely high voltage so that there can be an unexpectedly powerful charge
>stored on this seemingly benign dielectric surface.  One solution is not to
>coat the coil with a thick layer which keeps the windings near the surface
>where they will act to ground out the electrostatic charges.  Another (used
>by most) is just to realize the static charge is there and prepare one's
>self before grabbing it :-))
>
>	Terry
>
>
>
>

Christopher Michaelis
cmichael-at-xmission-dot-com

Pretium Corporation
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