Re: Main spark gap across one or both transformer legs?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: John <guipenguin@xxxxxxxxx>

Ok...I just looked at your pdf file with the capacitor chart... it 
looks like using 12kv 30ma transformer with 0.01uF will be safe   it 
calls for 0.0099

Hmm....this mailing list seems to be slightly slow.. so you may have 
already replyed...

On 10/3/06, John <<mailto:guipenguin@xxxxxxxxx>guipenguin@xxxxxxxxx> wrote:
Ok.... the only caps I have right now are 11x 910pF caps.... so the 
highest capacitance I can go is 0.01uF

If I were to use a 12000v 30ma transformer needing 
0.006631uF     then would it be safe using 0.01uF   with  pi/2* 
0.006631 = 0.010416uF     is that safe enough?


You are the first person to tell me about this rule.... everywhere 
else I have read it says resonant.

 for a 9kv 30ma transformer   11x 910pf is still low.....

On 10/3/06, Tesla list <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx > wrote:
Original poster: Vardan 
<<mailto:vardan01@xxxxxxxxxxxxxxxxxxxxxxx>vardan01@xxxxxxxxxxxxxxxxxxxxxxx>

At 04:49 PM 10/3/2006, you wrote:
>Never use the resonant cap size? if the resonant cap size is
>0.0088uF  then how much higher or lower capacitance should I
>go?    I was planing on doing about 0.0091 anyways

EEeeaakk!!  You want pi/2 x the 0.0088uF!!!

If you have a 9kV 30mA transformer and a static spark gap (pipe
tubes, bolts, etc. as opposed to a sync motor rotary gap), You need a
roughly 0.0133uF!!  The extra capacitance "loads down" the NST so it
will not go over voltage.

We should probably start putting "never use" warnings on cap
charts!!  I just fixed my document with a warning not to use resonant
value caps ;-)))

<http://hot-streamer.com/temp/FormulasForTeslaCoils.pdf>http://hot-streamer.com/temp/FormulasForTeslaCoils.pdf 
Version 3.3 now!

Cheers,

         Terry