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RE: Disappointing Results



Original poster: "Pete Komen by way of Terry Fritz <twftesla-at-qwest-dot-net>" <pkomen-at-zianet-dot-com>

David,

I would expect low current at high voltage from a Model T coil.  The
resonant value for a 15kv 30ma NST is a little over 5 nF (0.005 uF).  Note
that this is half of your value.  I am kind of guessing here, but I think
you should try a much smaller value for the cap.  Go ahead and try the
doorknob or even two in series.  Have you tried using any of the TC design
programs to get into the ballpark with your primary/secondary tuning?

Regards,

Pete Komen

-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Sunday, March 10, 2002 8:06 PM
To: tesla-at-pupman-dot-com
Subject: Disappointing Results

Original poster: "David Kyle by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<dave-at-kyleusa-dot-com>


I fired up the desktop model T spark coil powered coil with very
disappointing
results. It appears that the pulse caps I am using simply short out the
spark
coil as I get no spark across my spark gap even when it is nearly closed. So
here is the question: is it my choice of capacitor or have I selected too
high
a capacitance value for such a low power coil.



I know very little about the pulse caps I am using other than they are rated
at
.05uf at 10KVDC. I put 5 in series to yield a .01uf at 50KVDC. The cap does
measure out at the correct value and does not have measurable resistance
with a
multi-meter. There is no question that when the cap is put across the coil
it
simply shorts it out.



The spark coil might be good for about one milliamp but I had not expected
.01
would short it out. What value might be more appropriate? Would a doorknob
cap
be a better solution for a very low power coil?



Dave



=========================================
Dave Kyle
Austin, TX USA
Email: dave-at-kyleusa-dot-com