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[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.
D. Gowin