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Re: primary and secondary diameters and more
From: Esondrmn-at-aol-dot-com[SMTP:Esondrmn-at-aol-dot-com]
Sent: Wednesday, December 03, 1997 10:25 AM
To: tesla-at-pupman-dot-com
Subject: Re: primary and secondary diameters and more
In a message dated 97-12-03 02:38:42 EST, you write:
<<
Thanks for the information! Here is my current plan:
I would like to build something with a secondary in the range of 3.5 to 4"
diameter, with a neon transformer up to 60ma 12Kv, commercial caps. I
would like to have 12-36" sparks. As of now I have only a few parts
and have started to build the spark gap (easiest parts to find). I
would like to keep the cost down and am currently looking for the
transformer and caps. Should I get these then go from there after
I have the voltage and amperage ratings of the transformer?
I plan to put the whole primary inside an enclosure made of aluminum and
plexiglass. The secondary will be wound on polyethelyne or PVC tubing, I
understand PVC is not as good? The coils will be mounted on top of a
plexiglass top to the aluminum box.
The two sources of information I have at this time (other than the net)
are the Tesla Coil book by George Trinkaus and a book that has the plans for
the Information Unlimited coil of similar dimensions. The coil in the book
(BTC3) has the "bundled primary" I guess this is scramble wound?
Does this sound like it will work so far? What are the specs of anyone
elses successful project of similar size?
Thanks,
Chris >>
Chris,
It sounds like you are looking for a project similar to the small coil that I
built earlier this year. Secondary is 3.0" o.d. winding length 13.0" of #28
wire wound on an acrylic form. Toroids are 2' x 10" and 2" x 12", made from
styrofoam rings purchased from a crafts shop. Primary is 14 turns of #10
wire wound flat with .35" spacing between windings. If you build this
design, I would recommend using 1/4" copper tubing instead of #10 wire. The
primary form is acrylic. Capacitor is a home made rolled poly design using
two layers of .062 poly, C = .00475 mfd. I would suggest a slightly larger
cap, maybe around .006 or .008 mfd. This coil tunes right at turn # 14 on
the primary. Gaps are the RQ cylindrical gap using 6 gaps set at .028" each.
Power is two 12 kv 30 ma neons. I have two 3,000 ohm 25 watt resistors in
series with each HV supply lead and a safety gap mounted at the transformer.
This coil produces about 18" discharges but would do better with a better
primary and a little larger cap.
You should not mount the primary on an aluminum box. It should be 12" to 24"
above any metal surface.
Ed Sonderman