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*To*: tesla-at-pupman-dot-com*Subject*: RE: Optimum toroid size*From*: "John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)*Date*: Fri, 06 Oct 2000 16:04:19 -0600*Delivered-To*: fixup-tesla-at-pupman-dot-com-at-fixme

Paul - I did not intend to belittle your approach to finding a solution to the optimum toroid problem. I was only trying to find some TC parameter that could simplify the problem. The sphere had the unique chacteristics that both the voltage breakout and the capacitance depended on the same variable, the radius R. This made it easier to find the optimum size sphere for a certain size Tesla coil. The toroid does not have this advantage so the solution for optimum size will be more complicated. Any suggestions? Your cubic equation is an excellent way to simplify the finding of the sphere radius R. R = cube rt(169 J) inches Ctor = 2.8 R in picofarads The sphere capacity can be found directly Ctor = cube rt(3710 J) pf J = input watts x eff Ctop = Ctor + Ccoil This gives the coiler enough information to find the TC operating frequency and to design the primary circuit. The top terminal capacitance Ctor is one of the inputs for the JHCTES Ver 3.1 Tesla coil computer program. Up to now there has been little info on selecting this parameter. This parameter can now be found using the above equation. The JHCTES Ver 3.1 program coordinates and calculates 30 TC parameters and keeps them in tune. In the past coilers have found that increasing the toroid size in tests would increase the output spark. The problem was that there was no guidance for finding the optimum size. The equation above can now be used to help in the selection of the top load for any size Tesla coil. John Couture -------------------------- -----Original Message----- From: Tesla list [mailto:tesla-at-pupman-dot-com] Sent: Thursday, October 05, 2000 7:21 AM To: tesla-at-pupman-dot-com Subject: Optimum toroid size Original poster: paul-at-abelian.demon.co.uk My previous posting on this subject was intended merely to illustrate the difficulty of finding a simple formula for the optimum toroid size. If we're going to look at this further I should highlight, for the record, a couple of assumptions that were made. --------------------- snip Regards, -- Paul Nicholson, Manchester, UK. Secondary modeling project http://www.abelian.demon.co.uk/tssp/

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