Re: Torroid Formula (To Bart + All others)

• To: tesla-at-pupman-dot-com
• Subject: Re: Torroid Formula (To Bart + All others)
• From: "Antonio Carlos M. de Queiroz" <acmq-at-compuland-dot-com.br> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sat, 13 May 2000 20:08:21 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Tesla List wrote:
> 
> Original Poster: "Tabraze Malik" <tab-at-malik13.freeserve.co.uk>

> Now coming to the problem...
>     If you have the secondary coil (which obviously has capacitance) and
> connect the Torroid to it then basically what you have is 2 capacitors
> connected in series. The formula for capacitors in series is
> (1/CT)= (1/C1) + (1/C2).....
> where CT = total capacitance and C1 , C2 are the capacitances of the
> capacitors in series  (for as many caps you have in series). If you look at
> this formula it's not a big leap of maths to see that the total capacitance
> will be less than the capacitance value of any capacitor in series. This
> might explain why capacitance goes down when placed on the secondary.

No... The terminal capacitance is in parallel with the self-capacitance.
Both are distributed capacitances from the top of the coil to the
vicinities. Ct=Ctop+Cself. There are small variations in Ctop and Cself
due to the interconnection, but this can be ignored as a first 
approximation.

Toroid please, not "torroid".

Antonio Carlos M. de Queiroz

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