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Re: Cap Material
From: Rick Holland[SMTP:rickh-at-ghg-dot-net]
Reply To: rickh-at-ghg-dot-net
Sent: Saturday, November 29, 1997 5:28 PM
To: Tesla List
Subject: Re: Cap Material
Tesla List wrote:
<SNIP>
> When I remove that strip, I'll end up
> thinning the dielectric there to perhaps 1/8" vs. the 3/16" elsewhere.
>
> Which looks like:
>
> ___ ____ ____ ___ ___ ____ ____ ___
> | | | | | | | | | | | |
> | A | E |____ ____| E | A | | A | E |____ ____| E | A |
> | | | | | | | | | | | | | | | | _
> __|_ _|_ _ _|_A_|__|_A_|_ _ _|_ _|__|_ _|_ _ _|_A |__|_A_|_ _ _|_ _|_|
> |_
> In | | | | | | | | | | | | | | | | | | |
> |
> |__|_ _|_____|___|W1|___|_____|___|W2|___|_____|___|W1|___|_____|___|_|
> |_|
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> | | | | | | | | | | | | | | | | | |
> __|_ _|_ _ _|_ _|__|_ _|_ _ _|_ _|__|_ _|_ _ _|_ _|__|_ _|_ _ _|_ _|_|
> |_
> Out| | | | | | | | | | | | | | | | | | |
> |
> |__|_ _|_ _ _|_ _|W2|_ _|_ _ _|_ _|W1|_ _|_ _ _|_ _|W2|_ _|_ _ _|_ _|_|
> |_|
> | | | A | | A | | | | | | A | | A | | | |_|
> | | |___| |___| | | | | |___| |___| | |
> | A | E | | E | A | | A | E | | E | A |
> |___|____| |____|___| |___|____| |____|___|
>
> Thanks for your time,
>
> dj
DJ,
You have the right idea, but it needs to be both sides, or a wider
margin, depending on the voltage applied. Both sides should have a 1 to
2 inch margin of dielectric/insulator beyond the edge of the plate. The
only alternative I can see is to encapsulate the whole capacitor in some
strong dielectric material which would bond with the existing dielectric
material without gaps. This should effectively seal the plates and
insulate them from flash-over. In my mind's eye, I imagine some method
for melting poly and immersing the capacitor in a form that is 2 inches
longer and wider than your existing plates. If air bubbles could be
removed, you could wind up with a nearly commercial quality capacitor.
--
Rick Holland
The Answer is 42.