Re: Capacitance of toroids

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Adriano,

You don't want to calculate the capacitance of a stand alone 
toroid.  The calculation needs to be done in presence of the 
secondary and surrounding environment.  There are several tools 
available to do this.  JAVATC is the one that I am familiar with and 
is a very accurate tool.  BTW, inside and outside diameters, and 
major and minor diameters are two ways to describe a toroid. Javatc 
uses major and minor diameters.

http://www.classictesla.com/java/javatc.html

Gerry R.


> Original poster: "Adriano Mollica" <adriano.mollica@xxxxxxxxxxx>
>
> Hello to everyone,
>
> I almost finish the construction of my TC, but i have a little problem.
> I need a top load of 29pF, than i think is ok, and i'm going to make it by
> using a extensible aluminium pipe, that is pretty cheap and easy to put in a
> toroid shape.
>
> My question is, how can i calculate the capacitance of that toroid i'm gonna
> build?
>
> i found on internet two different way to calculate it, but  both use only
> two parametes witch are , in one case: internal diameter and external
> diameter, or in the other case: external diameter  and size of the pipe.
>  And of course, i obtained 2 quite different measurements. What i need, is a
> formula that use all three parameters toghether: inside diameter(d) ,
> external diameter(D), and size of the tube(x).
>
> do you know the answer?
>
> thanks, Adriano