Re: [TCML] bipolar coil

[David Dean <deano@xxxxxxxxxxxxxxxx>]

Hi Bart

Yes I screwed up calculating the resonant cap size.
I failed to use parentheses in the calculator. Got 25.1nF.

Let me try once more. Just rough and dirty, of course.

9000V / .060A = 150000 Ohms inductive reactance.

1/(150000*377) = 18nF resonant cap size. Better.
Double that gives 36nF.
Using 3 strings of 13 CD 942 150nF caps to get close
35nF.

Secondary 2.375" dia. X 11.85" winding length @ 84.8 tpi
gives 5.0 H/D, 10.4mH, 4.8pF by Ed Sondermans spread sheet.

Toroid 3" X 12" 13.3pF and resonant frequency 367kHz.

Primaries need total of 5.5microH to resonate @ 363kHz.

Primary ID 4.88", tube diameter 0.125", 0.25" spacing needs
7 turns for 11.7microH each. Again from Ed Sondermans spread sheet.

A little better.

later
deano

On Saturday 03 May 2008 12:16:09 pm bartb wrote:
> Hi Deano,
>
> Not for a twin coil. Each coil will have 1/2 the total inductance. This
> is what Kris is trying to account for. He's "doubling" the LTR cap size
> to find 1/2 the inductance in the model. He will actually only use 1/2
> the cap size as what he would insert into the model. Thus, if he used
> 46nF, he would have to insert 92nF which will allow the model to tune to
> 1/2 the inductance, in which case, he would require less than 1 turn per
> coil. This is the problem he ran into. He has to lower the cap value to
> change the LC ratio for more L.
>
> Take care,
> Bart
>
> David Dean wrote:
> > On Saturday 03 May 2008 05:27:41 am Kris Grillo wrote:
> >> I think I'll just stick with the original plan of 60mA.
> >
> > Hi
> >
> > Primaries in parallel and 46nF tank cap should tune
> > (each primary) near 6 turns and be 1.84 times resonant
> > cap size for a 9x60 NST. Frequency about 367kHz.
> >
> > No accounting for extra inductance in tank wiring though,
> > that might just be the killer.
> >
> > later
> > deano
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