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Re: Can anyone diagnose problems with our coil? (fwd)
Original poster: List moderator <mod1@xxxxxxxxxx>
---------- Forwarded message ----------
Date: Mon, 11 Dec 2006 17:23:59 -0800
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Can anyone diagnose problems with our coil? (fwd)
this is probably not great advice but..I have a small coil in my apartment
that i ground with a sink full of water with a stainless steel ashtray
submerged on one end connected to the bottom of my secondary on the
other..I have achieves 20"-24" sparks w/(3) NST attached. 12-14" sparks w/
(1) 15k30ma transformer.... The coil is a 3" secondary pvc w/22ga. wire
Also, how much gap do you have. The cap seem large to me also...I'm new
---- Tesla list <tesla@xxxxxxxxxx> wrote:
> Original poster: List moderator <mod1@xxxxxxxxxx>
> ---------- Forwarded message ----------
> Date: Mon, 11 Dec 2006 15:03:05 -0800
> From: john welch <jowelch@xxxxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: Can anyone diagnose problems with our coil?
> My student assistants and I just built our first coil. It kind of works,
> but we are getting little tiny streamers coming out from the top of the
> secondary coil and nothing from the ball on top.
> We have tuned the circuit fairly carefully so that their resonant f's
> are very close. We have a multiple spark gap made of copper pipes. We're
> using 2 Condenser Products pulse discharge caps in parallel to get .01
> mF rated at 10,000V. We have a 6000V neon sign transformer. We are
> grounding the secondary to a wall outlet ground - I've heard not to do
> this, but am not sure why and can't find much else to do indoors, and
> many people tell me that that's what they do. Our secondary coil is
> 22ga magnet wire around 3" PVC. The top end of the 22ga wire is
> connected to the ball, and the bottom end to a 5 foot length of 10 ga
> wire that I stick in the "3rd prong" of an outlet. Our primary circuit
> is the transformer directly across the spark gap, and the (cap and coil
> in series) also across the spark gap. We plug the transformer into a
> variac, and have both a line RF filter and a power factor capacitor.
> Any advice would be greatly appreciated.
> John Welch
> Cabrillo College Physics Dept.