Re: determining capacitance of a topload?

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Original poster: "Eastern Voltage Research Corporation" <dhmccauley-at-easternvoltageresearch-dot-com> 

Very easy.  First measure the resonant frequency of a secondary coil.
Then put the top load on it.  Re-measure the resonant frequency.

You will now be able to calculate the top load capacitance.  Its a rough
measurement, but should be good enough
for your purposes.

Dan



 > Hello Nolan
 >
 > Except for the case of a horned toroid, its is impossible
 > to uniquely determine the capacitance of a toroid from
 > only its surface area. You also need the diameter
 > inside the toroid. If you estimated the surface area from
 > a formula, then you already have two lengths by which you
 > could determine the capacitance. A horned toroid is a
 > toroid with no hole. Go to http://www.coe.ufrj.br/~acmq/programs
 > and locate the INCA program. The INCA program
 > has a calculator for a toroid.
 >
 > Godfrey
 >
 >  >Just a quick question, I found the surface area of an irregularly shaped
 >  >toroid which is 722 in squared, what do I have to do now to figure out
the
 >  >capacitance, Thanks!
 >
 >  >Nolan Moore
 >
 >
 >
 >
 >