Re: caps

• To: tesla-at-pupman-dot-com
• Subject: Re: caps
• From: Robert Volk <smrtmny2-at-earthlink-dot-net> (by way of Terry Fritz <twf-at-verinet-dot-com>)
• Date: Wed, 03 Feb 1999 12:28:25 -0700
• Approved: twf-at-verinet-dot-com

> 
> b.) You are using 24 mil TOTAL dielectric thickness. This means you only
have
> 12 mils (I am sure THIS IS your problem: measured vs. calculated) EFFECTIVE
> dielectric between the two plates. Mike´s caps (as far as I remember)
have 24
> mils BETWEEN the plates and 48 mils of total dielectric thickness. So, if
you
> add 4 sheets (2 per side) you will get 24 mils per side (48 total) and your
> capacitance will be reduced to 30.5nF per cap. As you are running three in
> series, this will give you a total capacitance of ~10nF. The total EFFECTIVE
> dielectric thickness across all caps will be 72 mils (24mils * 3 caps). This
> should be bulletproof up to 16kVac. If you are running a 12 or 15kV NST, you
> might want to think about leaving out one or two sheets per cap (one per
side
> for each cap). 
> 
> Hope this helped clear up the clouds.
> 
> Coiler greets from germany,
> Reinhard

Hi Reinhard,
Thanks for the info. I did re-build my caps using 4 layers of 6 mil in
between foil for a total of 48 mils. This gave me the .03 uF I was
after. I'm running a 15K/60ma NST. According to Mike, three of these
wired in series should be bullet proof. Why do you recommend removing a
layer or so from the cap?

Bob V

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