Re: Coil Woes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net> 

Hi Gary,

I remember your post.  Since Cres for your 15/60 NST is 10.6 nf (call it
0.01uf), your experiment would correspond to ~ 1 to 5 * Cres.  Im wondering
if the dummy load is affecting the results.  My computer simulations show at
values above 3*Cres, the inductive kick can not get things fully charged.
My actual measurements were between 1.6 and 2.5 * Cres where I scoped the
primary durning actual SRSG operation.  At 2.5 * Cres, I was drawing 1080
watts from the power cord and charging to 24KV at the time of bang (900
watts thru the gap).  I haven't gone larger than 2.5 * Cres cause I ran out
of cap.  So far the measured results agree with the simulation so Im
wondering if 4 * Cres would hold up during real operation.

Gerry R.

 > Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com>
 >
 > My cap size selection was determined by an experiment I performed with
 > different sizes between .01 and .05uF, in .01uF increments.  For each
 > size I determined the relative power delivered to the primary.  See
 > http://www.pupman-dot-com/listarchives/2004/April/msg01087.html for complete
 > details.  The bottom line was that with my particular NST, operating at
 > 140VAC in, the most power (C*V*V) was delivered using a .04uF cap.
 >
 > Regards, Gary Lau
 > MA, USA
 >
 > Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
 >
 > Hi Gary,
 >
 > Have you tried 2.8 * Cres with your 7x30 toroid?  I would think that
 > with 4
 > * Cres, you would not be able to charge to full output voltage.  You
 > might
 > get greater bang energy with a smaller cap.   With my 15/60 setup, I get
 > the
 > caps charged to 24KV with 2.5 * Cres.
 >
 > Gerry R.
 >
 >   > Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com>
 >   >
 >   > I know that I recently swapped my 7x30 toroid for a 6x24 toroid.  The
 >   > bigger toroid would only breakout reliably from a breakout point and
 >   > delivered my longest streamers.  The smaller toroid didn't need a
 > point
 >   > and readily broke out all over the toroid with shorter streamers,
 >   > probably similar to what you were saying.  This was with my 15/60,
 > sync
 >   > RSG, and a Cres*4.0 cap in both cases.
 >   >
 >   > Gary Lau
 >   > MA, USA
 >   >
 >
 >