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Oddball Oudin Coil


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From:  Jim Lux [SMTP:jimlux-at-earthlink-dot-net]
Sent:  Saturday, March 14, 1998 10:48 AM
To:  Tesla List
Subject:  Re: Oddball Oudin Coil



> From:  Atle Jorstad [SMTP:anjorsta-at-online.no]
> Sent:  Friday, March 13, 1998 5:38 PM
> To:  Tesla List
> Subject:  Re: Oddball Oudin Coil
> 
> >Many years ago, I read an article in an old hardcover book published
> >by Scientific American Magazine.  The author described building a
> >kicker-type coil, which he called an Oudin coil, using a Model-T
> >ignition coil.  He removed the secondary coil, but left it intact.
> >He rewound the iron core with lots of magnet wire, and retained the
> >interrupter assembly.  This was the "kicker" coil. Next, he
> >re-potted the old secondary winding inside a plastic sleeve and wound
> >the outside of the sleeve with 5 turns of copper tube.  I can't
> >remember what he used for a capacitor.  With the kicker coil
> >interrupter buzzing, the repotted secondary (now air-cored) put out
> >about 75KV.  Very interesting gadget. He used it to drive a homebrew
> >X-Ray tube.  I wonder why the multi-layer secondary coil didn't flash
> >over to itself?  If this physics hacker is still alive, he should
> >join this list--he'd fit right in.
> >
> >Recalling the old article raises a question.  How does a compact, 
> >multi-layer winding compare with a traditional single-layer resonator 
> >in terms of inductance, Q, resonant voltage rise, etc?  If not for 
> >the insulation problem, could a physically compact, multi-layer choke 
> >perform as well as a longer, single-layer resonator?  Would such a 
> >choke exhibit voltage rise due to impedance ratio, like a Tesla coil, 
> >or would voltage rise be due to turns ratio, like a regular 
> >transformer?
> >
> I have thought about building this oudin gadget myself, but i havent got
it
> done yet. and i have the same question: how can a ign. coil withstand
75kv?
> i have heard of super-coils doing this...but ive never seen one. Removing
> the iron core may make the insulating properties better. And perhaps the
> high frequency of these resonators does the same.
> 
> i belive the oudin coil is a 1/2 wave resonator. i saw a schematic of
one.
> the cap was 1uf, the primary contained 5 windings and the primary voltage
> was some 100s of volts. 
> Atle Jorstad
> 
> 

The article, scanned, is available on the web..
http://www.noah-dot-org/science/x-ray/index.html