[Fwd: Re: Capacitor search]
[ Part 1: "Included Message" ]
Date: Thu, 05 Dec 1996 09:46:11 -0500
From: Dan Gowin <gowin-at-epic-1.nwscc.sea06.navy.mil>
To: Dan Gowin <gowin-at-epic-1.nwscc.sea06.navy.mil>
Subject: Re: Capacitor search
Dan Gowin wrote:
> Tesla List wrote:
> > >From Esondrmn-at-aol-dot-com Thu Dec 5 00:20:41 1996
> > Date: Wed, 4 Dec 1996 13:40:50 -0500
> > From: Esondrmn-at-aol-dot-com
> > To: tesla-at-pupman-dot-com
> > Subject: Capacitor search
> > Well, it's about 15 degrees here and supposed to snow 6" to 8" tonight. I
> > have been reading about people building small coils and like the idea of
> > making a table top model out of a wine bottle. Sounds like a good winter
> > project. I've done some calculations and concluded that a wine bottle 3.0"
> > in dia. wound 7.0" high with #28 wire and a small 5" or 6" toroid would
> > oscillate at about 654 mhz. With a 12 turn primary made out of #10 bare
> > copper wire I would need about .0045 microfarads to tune at 80% of the
> > primary.
> > My question here is does anyone have some .002 mf capacitors they would be
> > willing to part with? I plan to use a 9 or 12 kv 30ma transformer. I have
> > never used the doorknob type capacitors and know they are not the best but
> > they would probably work in this application. I would probably want a 15 or
> > 20 kv ac rating.
> > Also, I need to find a source of large (2" or 3") ferrites so I can wind some
> > safety chokes to protect the transformer. Anyone know of a source?
> > Thanks, Ed Sonderman
> Ed, I did some off the cuff calcs on your numbers.
> Unloaded Resonate Frequency 908 khz
> Unloaded Q 93.67
> Loaded Q should be 41.63
> Inductance 7.034 millihenry
> Isn't your inductance a bit to low for this size
> of coil?
> D. Gowin
You can find your caps at R&D Electronics 1-800-642-1123.
HIGH VOLTAGE DISC CAPACITORS
2500 pF 6KVDC Z5U $0.75
2000 pF 10KVDC Real Big Disc $1.95
5000 pF 16.5KVDC D7OU502M $2.95
Using a parallel/series network you can build these into
any voltage/capacitor rating you choose.
Tesla coiler at large.