Re: [TCML] Topload design questions

["DC Cox" <resonance@xxxxxxxxxxxx>]

I usually go 1.2 x the minor toroid dia for the height to the base of the
toroid to the last turn on the sec winding.

most pri strike problems arise from overcoupling of the pri-sec coils.  Use
an emitter off the toroid to direct the spark to a ground stand.  Elevate
emitter (sharp point) by approx 35 degrees with the horizontal.  The sparks
shoot out and upward slightly, then curve down to strike your ground stand
(a second sharp point or series of points).

If a classic type coil, use javatc to set coupling in the range of 0.1 to
0.14 and you will not have problems.  I like to keep it loose, around 0.12
and seem to have
very good luck with this value.


Dr. Resonance




On Fri, Jan 2, 2009 at 10:35 AM, Karl Thorkildsen <
karl.thorkildsen@xxxxxxxxxxxxx> wrote:

> First off, Hello!  I've been lurking for a while and have gained a huge
> amount of knowledge by reading hundreds of posts here.  I have built a
> couple of coils and am working on a third.  This will be run off two 15/60
> NST's.
>
> My question is about topload configurations.  I understand the need to have
> a toroid in close proximity to the top of the secondary to avoid corona
> discharge from the upper part of the primary.  But if using two toroids, can
> the upper (and larger) toroid be elevated a few inches on a conductive rod
> without adverse side effects?
>
> For instance in my case I'm considering a 6.5x30 inch secondary, with a
> 3x12 and a 4x18 toroid and raising the 4x18 by 6 inches.
>
> Why, you might ask?  Well, I originally thought of this as a way to reduce
> primary strikes, but I now realize this might only be valid under certain
> conditions.  Another consideration is that it would look cool.  But in the
> end I'm now just curious what the effect and ramifications might be.
>
> Thoughts?
> - Karl
>
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