Re: Another First Light! (fwd)
---------- Forwarded message ----------
Date: Wed, 20 May 1998 11:06:38 EDT
From: Esondrmn <Esondrmn-at-aol-dot-com>
Subject: Re: Another First Light! (fwd)
In a message dated 98-05-19 00:46:22 EDT, you write:
<< Hello All:
With schoolwork, and finals week here I haven't much time to work on my
first coil, but I did nonetheless complete it and give it some initial
runs. The specs are as follows:
primary - flat pancake with .25" copper tubing (15 turns)
power supply - (2) 15kV 30mA NST's paralleled
chokes - 100 mH on each leg of the NST's
spark gap - RQ type (6 section (.1" combined) plus adjustable brass
gap(.225")) set at .325
capacitor - .0125 micro farad rolled polyethylene (.062"), filled with
safety cap - .001 micro farad, filled with transformer oil
safety gaps across the NST's and main cap
twin variacs rated at 17 Amps
toroid - 4" cross section x 25" diameter
grounding - 8' x 1/2" dia copper ground rod
secondary - see below
I had a two layer 6"dia x 22" length secondary wound with #28 magnet
wire, but I had a problem with the inner winding being shorted out
somehow, so I replaced it with an alternate secondary that I had wound
(4"dia x 20" with #22 magnet wire). The tuning took quite awhile,
beginning with zero spark length, and now properly tuned I'm pulling
around the 30-35" mark (loud as %&*-at-) Not bad for my first coil eh?
And plus I'm using the lower inductance secondary. Can't wait to
re-wire the 6" and see what I get.
Lynn, send me a message cause I can't find your email address.
Patrick Gustafson, Ozone plentiful in Eau Claire, Wisconsin
Congratulations! Sounds like a good project. The only concern I have is your
home rolled cap. I built two of these with only one layer of .062" poly for
the dielectric and blew both of them using 12 kv neon sign transformers. I
believe one layer of .062 is only good for about 9 kv in a Tesla tank circuit.
Let us know how it holds up.