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Re: Fully threaded coil forms; *extremely* powerful Oudin Resonator

Hi Jeff, All,
    Very interesting system!  What would happen if you put a 12"
toroid on it and retuned?  What size capacitor were you using?


----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, May 29, 1999 10:41 AM
Subject: Fully threaded coil forms; *extremely* powerful Oudin
Resonator


Original Poster: "Jeff Behary" <jeff_behary-at-hotmail-dot-com>

Hello,
I have tried a few things rather unheard of these days in regards to
coil
winding.
First, I threaded my coil form before I wound it...time consuming, but
fun!
[12" Shelton Lathe: 3 passes to true OD (115 RPM), 2 passes of
threading
tool (30 RPM)]
Second, I wound both primary and secondary coils on the same form,
like an Oudin Resonator.
Coil Form: 8.625" PVC, approx. 9" tall.
Secondary: Approx. 172 turns, 30 AWG, wound into 6" of cut threads--
28 TPI.
  Approx. 1 1/2" of pipe, directly under secondary, last turn soldered
directly to it.
Primary: 6-8 turns of bare copper wire, wound into grooves cut at 6
TPI.
To just run a quick test of the coil, I wired it up to a tiny 6kV 20mA
neon
transformer/condenser/stationary gap - the results were spectacular
for such
a small bugger.  I was sitting on the floor 2 foot away and instantly
the
hair stood up on my arms and legs from the effleuve- after switching
off the
lights, the coil was even more immpressive on this 5 minute test...the
entire surrounding air of the top of the coil was ionised, and in a
totally
untuned state sparks well over 6" of an enormous quantity were drawn
off to
a chunk of aluminum bar stock.

To briefly describe the effluve, branching brush discharges leaped out
from
the top most wire about 5" in length, powerful ionisation of the air
towards
a grounded object [my arm] as far as 8-10"; with proper adjustment of
spark
gap it is likely a 12" fine grain effluve could be had.

I was very surprised by the intensity of the sparks -- the discharge
to
ground consisted of many thick sparks, very powerful for the small
tank
circuit.
It is very compact, and looks superb with some maple polyurethane.
The pre-threaded form, "wire in grooves" is quite attractive...if not
a bit
unusual!
Jeff Behary
http://www.lvstrings-dot-com/quack.htm


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