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Re: High-Bandwidth Primary Circuit Behavior (fwd)
---------- Forwarded message ----------
Date: Thu, 30 Apr 98 14:17:10 EDT
From: Gary Lau <lau-at-hdecad.ENET.dec-dot-com>
To: tesla-at-pupman-dot-com
Subject: Re: High-Bandwidth Primary Circuit Behavior
>I have written a paper on all this. It is available in Word 97 formated
>as an HTML web document at:
>
>http://www.peakpeak-dot-com/~terryf/tesla/experiments/experiments.html
Terry,
In your "New Model" of the primary circuit, you have the self capacitance of
the primary inductor as 150 pF, measured by finding it's self resonance.
I tried the same on my primary, 13 turns of .25" copper tubing, 15 degree
saucer, ~6" ID. I found the strongest resonance at 24MHz, suggesting a self-C
of only 0.75 pF. Considering my 4.25" x 22" secondary only has about 9 pF of
self-C, I'd say 150 pF for a primary is way too high.
There must be something else in your rig resonating at 1.2MHz. I wonder what
the ESL of the tank cap is and how to measure that? But then, that wouldn't
ring when the gap opens. How about your (wire wound) protection resistors?
Regards,
Gary Lau
Waltham, MA USA