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Re: Idiot's Guide



At 10:53 PM 1/23/97 -0700, you wrote:
>Subscriber: MALCOLM-at-directorate.wnp.ac.nz Thu Jan 23 22:35:08 1997
>Date: Fri, 24 Jan 1997 11:34:31 +1200
>From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
>To: tesla-at-pupman-dot-com
>Subject: Re: Idiot's Guide
>
>Thomas McGahee asks....
>
>> This is an On-Going Work In Progress.
>> See any errors? Did I leave something Out?
>> Anything that is Now Confusing You Even More Than Before?
>
>Like to make a couple of comments:
>
>mega snip

 The problem is the
>> Capacitance of the Secondary is affected by many physical parameters such
>> as thickness of insulation, kind of insulation, number of turns, exposed
>> surface area on the outside of the coil, height of the coil, width of the
>> coil, closeness to other objects, and of course, ANYTHING YOU PUT ON THE
>> TOP OF THE SECONDARY. PHEW! It's NO WONDER you can't just crank a lot of
>> info into a computer program and expect it to spit out complete plans for a
>> Coil that is guaranteed to work the First Time you fire it up!
>
>I have to disagree with that. Well tested formulae that can predict 
>raw Cself have been posted on the list a number of times. It is true 
>that one assumes a reasonable degree of isolation from other objects
>and also that toploads add to the static figure. Also that 
>sparks/corona/ion clouds add to this figure when the coil is 
>operating.
>
>Malcolm
>

Malcolm,

You are correct in what you say in this last comment and formulae will
assist, but as mentioned above, we just can't know all the little effects
which are at work and some of the least suspected (when acting in concert)
can pull a secondary off frequency enough so that even if totally isolated
it will require another half to full turn on first firing over the supposed
tune point recommended all those wonderful equations!

Richard Hull, TCBOR
>