Re: [TCML] Effect of doubling the input current

["DC Cox" <resonance@xxxxxxxxxxxx>]

If you double the current, usually double the cap size, readjust the pri
tap, and spark output will increase approx 30-40% (rule of thumb).

Tesla coil oscillator caps just love current, even more so than voltage.
More current allows cap to charge faster resulting in more pps when the
appropriate type of spark gap is used.

Dr. Resonance




On Mon, Dec 8, 2008 at 4:08 AM, Phil Tuck <follies@xxxxxxxxxxxx> wrote:

> Hello Group.
>
>
>
> I have a query over charging currents following an exercise on my coil of
> doubling the input current.
>
> I was originally running my old 10k/48 into a 0.02143 uF cap.
>
>
>
> However I recently acquired two identical [new] 10K/50 's and tried these
> in
> parallel for 100 ma.
>
> My coil was already 'ball park' tuned for the 48m/a  NST, when I
> substituted
> the two new 50 ma NST's.
>
>
>
> I left all other settings on the coil alone (apart from making sure the
> safety gap was still appropriately gapped - voltage outputs can vary
> despite
> what the labels say)
>
>
>
> I did not expect any really significant difference as it was only the
> current that had increased not the voltage, nor my cap size.
>
> The 'Freau' formula of Spark length is 1.7 x SQRT(Bang Energy x BPS). Now
> the bang energy [or so I thought] depended on the value of the cap x the
> voltage at the gap squared.
>
>
>
> As I was still using my original sized CD' MMC caps of  0.02143 uF and not
> the recommended size for 10/100 of 0.0477uF,  why did I get such a massive
> increase in performance. I would estimate the spark lengths are double to
> the 48 ma original NST.
>
>
>
> If I had doubled the  current  and also doubled the cap size [necessary to
> have charged to them the same level] I could understand why.
>
>
>
> Is it that my tuning was less than perfect originally and with the 100ma
> NST's it is nearer the mark ?
>
>
>
> Phil
>
>
>
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