Desktop Coil ground? (fwd)

From: 	D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Monday, January 19, 1998 6:06 PM
To: 	Tesla List
Subject: 	Re: Desktop Coil ground? (fwd)

to: Mike

With this size coil you might consider using an oil burner ignition xmfr
(OBIT).  Most are rated 10 kV at 23 ma and will usually charge a .005 MFD
cap reasonably well.  I made a small unit this size and took it to Ed
Wingate's Teslathon this year.  It produced 5-6 inch sparks.  I used a
simple 2 gap design (2 small gaps in series) and a commercial .005 MFD cap
with a 3 turn primary coil.  I started with 16 turns and tapped until it
worked best with the cap and sec. load.  The caps are very small (3/4 inch
x 2 inch x 1/4 inch) which allowed me to use a base only 7 1/2 inch wide. 
Used delrin spacers 4 3/4 inch high to separate the sub-base pieces which
were 1/4 inch phenolic type LE.  If you need any caps I have them in stock
005 MFD  9 kV (will work on 10 kV) for $25/unit.  


> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Desktop Coil ground? (fwd)
> Date: Monday, January 19, 1998 9:34 AM
> ---------- Forwarded message ----------
> Date: Mon, 19 Jan 1998 08:27:36 -0800 (PST)
> From: baumann-at-proton.llumc.edu
> To: tesla-at-pupman-dot-com
> Subject: Desktop Coil ground?
> I am in the process of designing/building a desktop coil for a friend
> that is a physics teacher. Can you think of a better way to get kids
> interested in science that arcs? :)
> Anyway: It is pretty obvious that said coil must be small,and that is 
> not really a problem. What is a problem is how to ground the beast.
> The instructor is not allowed to do little things like pound 8ft rods
> into the ground outside the class.
> [Proposed coil would be: 1"x10" 28awg, with a 2-3" spherical topload`
> I will have to find ferrite toriods or sticks to build the protection
> circut. At this frequency, he will be able to use a small cap, and yet
> still get 5-6" arcs at least.
> -- 
> --
> Michael Baumann  Optivus Technology Inc.|Loma Linda University Medical
> San Bernardino, California. (909)799-8308 |Internet: baumann-at-llumc.edu