Re: Toroid Capacitance vs. Frequency

Hi Yuri,

	I have a computer program that will calculate the resonant frequency given
the dimensions of your coil.  It is at:


You can see how different top terminals affect the frequency.  There is a
text file that tells how the program works.  In general, the larger the
terminal the lower the frequency.  I am not a fan of the 1/4 wavelength
theory and there are some papers below you may be interested in.


There are also some great formulas and general info about coil design at: 




At 05:27 PM 7/1/99 -0700, you wrote:
>I have heard that a wide variety of sizes, shapes, and capacitances of 
>discharges terminals can be used on any given secondary coil. What I would 
>like to know is, how does the capacitance or size of the discharge terminal 
>effect the resonant frequency of a secondary? I ask this because I'm having 
>a bit of a problem with my resonant frequency. Can I alter this value by 
>using a bigger or smaller discharge terminal? My exact situation is that I 
>have a quarter wavelength resonant frequency of 165.24 kHz. I would like to 
>alter this to get it as much higher as possible. Thanks for any help.
>-Yuri Markov
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