Re: .025ufd use

• To: kharrar-at-as.arizona.edu
• Subject: Re: .025ufd use
• From: Esondrmn-at-aol-dot-com
• Date: Mon, 7 Aug 1995 13:52:16 -0400
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In a message dated 95-08-07 09:44:58 EDT, kharrar-at-as.arizona.edu (Karl
Harrar) writes:

>Ed,
>
>I saw your last posting and would like to know the coil 
>dimensions you used in conjunction with your .025 ufd cap.
>I have a .025 ufd and would like to build a small TC. Do
>you know the operating frequency? I am going to build a
>variable frequency switching supply so I can adjust the
>freq. for best coupling. Thanks for any help you can offer.
>
Karl,

My secondary is built on a 6.0" dia pvc pipe - probably 6.25" od.  It is
covered with 5 - 6 coats of polyurethane.  The wire is #22 formvar covered
magnet wire - then covered with another 6 coats of polyurethane.  I believe
the winding length is 27"  (my records are at home and I'm at work).  There
is approximate 960 turns.  Primary is 15 turns of 3/8" copper tubing wound on
a plastic coil form at 30 degrees (saucer shaped).  Toroid is 40" in dia and
5 or 6" thick.  Spark gaps are one rotary with a static gap in series.  I
haven't checked the frequency since I built my newest toroid.  With my 33"
toroid, I believe the frequency was about 130 khz.

Good luck,  Ed Sonderman  

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