Re: [TCML] 40AWG secondary coil

["DC Cox" <resonance@xxxxxxxxxxxx>]

I've wound some small coils with 42 AWG wire.  They worked fine when powered
by a small 6 kV 20 mA open frame core/coil type nst.

The important part is to set your coeff. of coupling between 0.1 and 0.14
(max).  Overcoupling is the
cause of racing sparks.

So, you can use any gauge you prefer just run it thru JAVATC to check the k
factor.  You can adjust the "what-if" in JAVATC to different pri-sec spacing
values, and also the height sec H1 above the primary height H1=H2 (in the
case of a flat spiral) to get almost any k value in the range 0.1 to 0.14.

With smaller coils 0.14 seems to be the best while larger coils (6" dia and
up) seem to work best with slightly looser coupling (long sparks) with
coupling in the range 0.1 to 0.12.

Dr. Resonance




On Sun, Dec 28, 2008 at 8:21 PM, Christopher Karr <chriskarr4@xxxxxxxxxxx>wrote:

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> Hello, everybody,
>
> I was reading, recently, about a coil that was using 34AWG wire for the
> secondary and was ran at low power levels (150VA) without any racing sparks
> or any other forms of damage. I was wondering if it would be possible to use
> a secondary wound with 40AWG wire, or if this would just be a ridiculous
> idea.
>
> I understand that it would be extremely difficult to wind a secondary with
> this thin of wire, and that the chances of the wire breaking are large, but
> I'm looking for more of a proof than an efficient coil. The form I would be
> using is a cardboard one with a spray-coat of polyurethane, 1.5" diameter by
> 7" height.
>
> Since TeslaMap didn't have a 40AWG option for secondary wire, I had to do
> my own calculations -
>
> Using a wire diameter of 3.14 mils to represent the diameter of the 40AWG
> wire, I divided '1' by '3.14' and multiplied by one-thousand so that the
> number would be how many winds per inch, instead of winds per mil. I took
> that number and multiplied it by '7', the intended number of inches for the
> secondary's windings in length; I came to the answer of 2229.29 winds in
> seven inches, with a height:diameter of 1:4.66(etc.), which is acceptable
> for small coils.
>
> Since the power supply I'm using is only 3KV at 15mA I have a primary
> capacitance of 20nF (.02µF). The input power is only 45VA, which isn't much
> energy, especially when the capacitor's output is only about .1 Joules
> (.09).
>
> Anyways, I'm just wondering if you guys think it'll work, and I'm hoping to
> get a topic started.
>
>         - Christopher
>
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