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Re: First Light (was: Best case senario secondary output?)
Justin,
I have a coil close to yours in size,a 3.5-inch secondary, and I got best
results be decreasing the cap size and taping the primary to be nearly as
big as was possible. I got and average of 18-inches, with a 24-inch
streamer every once in a while taped at 13.5 turns on the primary. You
might try this -- it may work. MMC cap may be different, and I'm curious to
try out Terry Fritz's new cap matching equation. That was on cold, dry
evenings in Colorado though, at school in Texas, I haven't been able to get
it in tune (although I've only tried once). Try it, it may work.
My two cents,
Daniel Lockhart
> Well, I ran my second coil for the first time last night with a new,
>larger primary coil. (In the intrest of making it easier to form the spiral,
>I accidently cut the copper pipe too short when I made the first primary, but
>secured it to a piece of plexiglass anyway, hoping the coil would still run
>well. I only got 2"-3" arcs, not at all what I was hoping for.) The new,
>correctly sized primary coil made a world of difference, and I am glad to
>report maximum of up to 7"-8" arcs were acheived to a grounded rod. Anyway,
>here are the specs:
>
>Secondary:
>13.5" long
>3" diameter
>varnished cardboard mailing tube
>26 gauge enameled magnet wire
>about 780 turns.
>Toroid:
>3.5" diameter aluminum ducting
>8" diameter of torroid from center to center
>385Khz Resonant frequency w/ torroid
>
>Primary coil:
>pancake spiral of 9.5 turns tuned at 6.9 turns
>1/4" copper refrigerator piping
>1/4" spacing
>Inner diameter: 5.5"
>Capacitor:
>.009uF MMC made with 81 6KV, .001uF hockey puck type capacitors
>10 ohm bleed resistors across each capacitor
>Spark gap:
>Richard Quick style static multi gap
>
>Power source:
>9KV, 30ma NST
>> snip! <<