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Re: First coil - questions
to: Keith
Your coefficient of coupling is way too tight. The lowest turn of the sec.
coil should start 1 1/2 inches ABOVE the primary horizontal plane and the
primary to coilform spacing should be 1 1/2 inches also for most small
coils. Use a complete flat Archemedian spiral for the primary. If you
have had any white (hot) sparks from primary to secondary you will probably
have to rewind the sec coil and it now has small pinprick strike damage and
will start breaking down with continued use. Make the above listed changes
and you should not have any more problems with your system.
DR.RESONANCE-at-next-wave-dot-net
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> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: First coil - questions
> Date: Friday, November 27, 1998 11:13 PM
>
> Original Poster: Keith Garvin <keithg-at-datalight-dot-com>
>
> Hello everyone,
>
> I managed to get my first real TC running last night.
> I went through several very cheaply built main
> capacitors before doing it right. I built alot of
> the components over the last year and without any
> input or research and did alot of things wrong.
> But now that I got it doing something neat, I can
> build it up.
>
> The specs follow:
> 6" secondary wound to 21.125" in length
> Unused toroid (4" by 16")
> (can't get break out or tuned so I am not using it)
> .250" refer tubing spaced at 2.50" at 19" angle
> 6.75 turns
> 12KV -at- .060A
> approximately .1875" spark gap (Four 2" copper couplings)
> .01uf rolled poly cap (25KV) 72 mil (12 6 mill sheets)
>
> It produces continuous 12" to 17" arcs (measured point to
> point)
>
> First problem:
> 1) The only way I can get it to work well is if I connect
> the inside turn of my primary to the secondary, otherwise
> I get about 5" arcs jumping between the secondary and
> primary coils an no output.
>
> 2) If I connect my toroid, I get no arcs, even with a bump.
>
> 3) I am not connecting any ground to the primary. I thought
> it was not 100% necessary, can anyone correct me? (Its
> under construction.)
>
> 4) Is the arc output sound right? Should I be able to get
> more or less output?
>
> Any help would be greatly appreciated.
>
> Thanks in advance!
> Keith
>