[Prev][Next][Index][Thread]
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