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Re: A few questions about coil designing
Original poster: "Dave Leddon" <dave-at-leddon-dot-com>
Hi Dave,
>BTW, what sized toroid and secondary coil length were you using
>to get 14 ft. arcs? That's about the spark size that I'm hoping
>to achieve with my finished coil.
The secondary was a 12.5" diameter pvc drain pipe and was wound 48" long
with #20 heavy-build, about 1200 turns. I ended up using two spun metal
toroids, 32 x 8 and 26 x 6 inches spaced 9" apart with a 6" diameter
aluminum cylinder (see picture):
<http://nick_tesla.home-dot-comcast-dot-net/Segmented_Gap.jpg>http://nick_tesla.home-dot-comcast-dot-net/Segmented_Gap.jpg
That strange looking contraption attached to the top toroid is a segmented
gap, an idea I got from Dr. Resonance, that I use as a tuning aid. Each of
the movable sticks hanging from weed-trimmer line have a small nail through
the bottom which direct the path of the arc. The nail furthest from the
coil is grounded and, in this shot, is at a distance slightly greater than
14 feet. You might be able to do better than this with a larger toroid and
a 15 KVA pig driving 200 nf of tank cap, as suggested by Dr. R. Just be
sure that your arsg is up to the task.
Dave Leddon
Pleasanton, CA