Re: Tapered Secondary Coil

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• Subject: Re: Tapered Secondary Coil
• From: Ed Harris <harris-at-parkave-dot-net>
• Date: Sat, 5 Oct 1996 23:17:10 -0400

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> From scottb-at-aca.caFri Nov 22 20:30:34 1996
> Subject: Tapered Secondary Coil
> 
> 
> I have seen some secondaries that are tapered, and some that are not. 
What 
> (mathematically) is the difference, and what are the effects??
> 
> /sb

Scott,

If you use cylindrical winding forms a torroid is probably the best top
terminal with which to control the electric fields near the top of the
coil; it also of course provides some extra capacitance which also allows
greater energy storage for a given output voltage E=0.5CV^2....Now, if all
you have are spheres for top terminals, you'd better use a tapered coil
form or a very large sphere in order to get the same control of high
electric fields near the top of the coil. If there is also another  reason
for tapering a coil, I'm unaware of it.

-Ed Harris

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