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

Jeff

This would probably make a great driver for a small magnifier!! Try
winding another coil on say a 3" form, with finer wire to about 1:5
h/d ratio. Connect this with a strap to the top of your first coil.
Add a toroid to the second coil. See what happens!

However, I know very little about magnifiers, so you may want to put
this to other list members who might know more about the precise
dimensions you require.

Alex Crow


On Sat, 29 May 1999 15:41:47 Tesla List wrote:
> 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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