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Re: Yet another first coil question
Subject: Re: Yet another first coil question
Date: Thu, 5 Jun 1997 22:30:19 -0600
From: "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
To: "Tesla List" <tesla-at-pupman-dot-com>
To: Matt McArthur
If you can locate a local neon sign shop and somehow manage to make a
deal
with the manager to allow you to "borrpw" a 12 KV 30 ma neon sign
transformer you might notice a small gain in performance. Also try a
xmas
tree decoration with alum foil (smaller discharge electrode) as it
sounds
like your "load" might be too large for your light bulb terminal.
Either
try a smaller terminal or try a slightly larger xmfr (more drive
current).
Also try a brief blast of compressed air or small fan to blow air
through
your sparkgap while it is running -- improves quenching and might
improve
output.
Try elevating the sec. coil in 1/4 to 1/2 inch increments with some
scrap
plywood to see if this adjustment of "coupling factor" improves your
performance.
This should get you going in the right direction.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-poodle.pupman-dot-com
> Subject: Yet another first coil question
> Date: Thursday,June 05,1997 8:59 PM
>
> Subject: Yet another first coil question
> Date: Wed, 4 Jun 1997 16:55:26, -0500
> From: RSNV02D-at-prodigy-dot-com ( MATT MCARTHUR)
> To: Tesla-at-pupman-dot-com
>
>
> Hello all,
>
> I have been silently watching this list for a month or
> so now (except when I argued on how caps work) and
> I finally finished my first coil. I am using a 10KV 23mA
> OBIT transformer with a .0061 uF leyden jar cap. My
> primary is 7" in diameter, with a total of 10 turns -at-
> about 6" tall. The secondary is 3.5" PVC with 486 turns
> of .025 enameled wire. My supposive operating
> frequency is around 600KHz.
> I am running two series gaps made out of brass angle
> brackets and carriage bolts. My discharge terminal is
> pretty cheesy, its a large globe 60 watt light bulb covered
> with aluminum foil.
> The only problem I am having is that after I fire it up and
> tune the primary at about 7 - 8 turns (depends on the
> spark gap spacing) I only get 6 inch sparks at most. The
> sparks sre pretty weak too. The bottom of the secondary
> is earth grounded and the discharge was to a spool of chicken
> wire that was also grounded.
> The only thing that I can think of that is wrong is primary
> secondary coupling. The secondary sits almost all the
> way down in the primary. I just read a post that said
> something about raising the secondary to about an inch and
> a half above the primary to improve coupling.
> Could someone please help me out here!!!???
>
> Thanks
> --Matt