Re: Can anyone diagnose problems with our coil? (fwd)

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Original poster: List moderator <mod1@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Mon, 11 Dec 2006 17:23:59 -0800
From: chipford@xxxxxxxxxxxx
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
too...

---- 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.
> thanks
> -John
> 
> -- 
> ******************************
> John Welch
> 
> Cabrillo College Physics Dept.
> 
> 
>