Re: Big TC design

• To: tesla-at-pupman-dot-com
• Subject: Re: Big TC design
• From: Esondrmn-at-aol-dot-com (by way of "Terry Fritz (moderator)" <twf-at-verinet-dot-com>)
• Date: Thu, 03 Dec 1998 17:01:35 -0700
• Approved: twf-at-verinet-dot-com

In a message dated 12/2/98 10:08:17 AM Pacific Standard Time, tesla-at-pupman-dot-com
writes:

<< Original Poster: "Marco Denicolai"<Marco.Denicolai-at-tellabs.fi> 
 
 What I am wrestling with now is a rough design of secondary and primary
 coils:
 
 - secondary 15" wide by 60" high, 931 turns, 73 mH, 112/62 kHz
 - toroid 10" section 60" outside diameter 62 pF
 - primary spiral 18" inner diameter, 12 turns, 128 uH
 - --> Primary capacitor must be 0.056 uF
 
 I would like to maximize the capacitor size, to be able to pump more energy
 into the primary. The problem is that, having a big secondary, I must have
 a big primary inner diameter too. With just 12 turn of primary my capacitor
 (required to be tuned) drops down to 0.056 uF. I would have liked at least
 a 0.1 uF...One possibility is to use only 8 turns (--> Cap = 0.123 uF).
 
 With 0.056 uF and 20 kV the cap energy would go up to 11.3 Joules, while
 with 0.123 uF up to 24.6 Joules.
 
 Any suggestions anybody?
 
  >>
Marco,

This is indeed a big coil.  I did some reverse calculating and it looks like
your planned toroid capacitance is only about 60 to 70 pf.  I have almost that
much on my 6.0" coil.  I would think you would want one or maybe several very
large toroids for this coil.  That will decrease the resonant frequency even
further and require more tank capacitance.  I think designing the system to
use .10 uf would be a good idea.  I use a .05 uf cap with my system.

Ed Sonderman

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