Re: Mini-coils?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com> 


Good idea Chris but it won't fly.  We've worked with the Emco units.  They
have automatic internal shutdown any time a spark occurs or excessive corona
occurs.  They come back in 1-2 sec. but just won't work for a TC power
source.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, September 18, 2003 6:12 PM
Subject: Re: Mini-coils?


 > Original poster: Chris Roberts <quezacotl_14000000000000-at-yahoo-dot-com>
 >
 > One thing that I've always looked at to build one of these micro coils are
 > these mini HV power supplies from EMCO:
 > <http://www.emcohighvoltage-dot-com/>http://www.emcohighvoltage-dot-com/ If you
 > look at the "Q series" they are these puny little DC to HVDC converters.
 > The current coming out of the really high voltage models is pretty small,
 > but should work on that small of a coil. You could then run the thing off
 > of 3 1.5 volt batteries - probably C cells or something. I've always
wanted
 > to build a coil this small, but so far my large coil keeps killing parts,
 > and replacing them isn't cheap. =( Good luck!
 >
 > Tesla list <tesla-at-pupman-dot-com> wrote:
 > Original poster: The MCP
 >
 > This was a cute little thing I thought about a while back. I was
considering
 > taking some batteries for power, one of those little step-up switching
 > transformers you find in portable fluoresent lights, and using it to power
an
 > ultra-tiny tesla coil (secondary maybe 1-2 inches tall, .5 or so dia).
 > Methinks it'd be a cute demonstration coil.
 >
 > The problem I see is creating a good secondary. If you shoot for 750
turns,
 > that comes out to 350 turns per inch, which would require *42 gauge*
magnet
 > wire. Not only will you be using something far smaller than hair and
rather
 > ductile, but the 100 feet of wire used would have almost 160 ohms of
 > resistance (The same as my coil). I can't imagine this having a good
effect
 > on performance. On the other hand, if you can stand to settle for a mere
500
 > turns! on the secondary :) then the resistance drops to 86 ohms.
 >
 > I went to the new version of JavaTC, and it says that this baby coil will
 > resonate at 4.86Mhz, and has .91pF of self-capacitance.
 >
 > I did a little theorizing on the primary coil, and (if you use a 12.5nF
cap)
 > it should be a single 1-inch diameter turn at the center of the coil.
 >
 > I haven't quite figured out what to use for a power supply
(Current-limited +
 > wall plugin or batteries + mini switching supply) and I was wondering if
it
 > would be possible to use a high-speed power transistor to switch it.
 >
 > Well, that's my cute idea for the day. My idea for the setup is to keep
the
 > electronics in a box, about 4" long, 2" wide, and maybe 1" tall. Then
mount
 > the coil horizontally above that, and just rise the 1-turn coil out of the
 > box. Attach the ends of the coil to a pair of little balls on movable
mounts.
 > BANG, instant miniature tesla coil. Or no?
 >
 > The idea occured to me when al! l my friends were amazed by the coil I
already
 > built (No one recognised the term "tesla coil" so I ended up calling it a
 > "lightning machine." Sigh...), underperforming as it is. So why not make a
 > cute little coil to play with?
 >
 > Plus, since it is (except for the transistor) a real tesla coil, you can
use
 > it to explain how they work. Ok, I'm done talking now.
 >
 >
 >
 > -Chris
 >
 > "The trouble is not that the world is full of fools, it's just that
 > lightning isn't distributed right." -Mark Twain
 >
 > "Only two things are infinite, the universe and human stupidity, and I'm
 > not sure about the former." -Albert Einstein
 >
 >
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