Re: Toroid question two

[FutureT-at-aol-dot-com (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

In a message dated 8/30/00 4:44:23 PM Pacific Daylight Time, tesla-at-pupman-dot-com 
writes:

> Original poster: "Dan Kunkel" <dankunkel-at-hotmail-dot-com> 
>  
>  Experts,
>  
>  is there a specific formula that will tell you the optimum total topload C 
>  you should have, other than the 1/4 tuning point? or is the only way to 
tell 
> 
>  by pilling on C until you get the best results?
>  
>  also same question, but for tube diameter (breakout voltage i mean).
>  
>  Dan

Dan,

There are probably formulas that could be used or developed, but
I use rules of thumb.  I generally make the toroid about 1/4 to
1/3 the diameter of the desired spark length, and use that to begin
the TC design process.  I also generally make the toroid thickness
= to about 1/10 the the desired spark length for a smooth toroid,
a little thicker for a corregated toroid.  Then I can use my power
formula to determine the needed input power for the desired spark
length.  Large bang, low bps TC's will need a larger toroid than
small bang, higher bps TC's however.  I also like to make the 
toroid about 3 times or more the diameter than the secondary.
A large secondary will tend to shade (eliminate) some of the 
toroid's C.

John Freau