Re: Coil Woes

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

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


I have always advocated Cres value * 1.6, however, lately, I'm changing my
thoughts on this value.

The 1.6 does give the longest sparks, however, the nature of the sparks are
"stringy" and not active and "dancing" off the toroid.

Lately I've been using Cres * 1.2.  This value reduces the chances of
resonance between the supply NST and  capacitor bank while producing a very
pleasant and active spark field that literally "dances" off the toroid
seeking ground.

Try this experiment yourself using both values 1.2 and 1.6 and you will see
what I mean.  The 1.2 value has more charging current which produces better
looking discharges.

For us, it's back to 1.2 * Cres for the best looking spark discharge.  You
only loose a few inches.

Dr. Resonance

 >  >
 >  > My question today concerns transformer to capacitor match. I input the
 > data
 >  > into three separate programs and got three completely different
 >  > answers.  The values of the transformer are as follows; Input 120 volts
60
 >  > Hz and the output is 12,000 volts at 30-ma. NST. Initially I built an
mmc
 >  > of 0.007 uf , 20,000 volts. Several people have suggested that I need a
 >  > 0.01 uf cap to power my coil. How is this value obtained?
 >
 > One 12KV 30ma transformer will resonant at 60 Hz with a 6.6 nf cap.
 >
 > Cres(nf) = 10^9/(2*pi*line_freq*XL)  where XL ~= 12000V/30ma
 >
 > If is common practice to avoid resonant charging by using a LTR (larger
than
 > resonant) cap.
 >
 > for static gaps Cltr = 1.6 * Cres (give you about 120BPS)
 > for SRSG        Cltr = 2.8 * Cres  (at 120 BPS)
 >
 > 0.01uf would be 1.5 * Cres.
 >
 > As you add more 12K/30 NST, add 0.01 for each extra NST.
 >
 > Gerry R.
 >
 >
 >