Re: Mini-coils?

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

Original poster: Chris Roberts <quezacotl_14000000000000-at-yahoo-dot-com> 

So how hard do you think it would be to bypass these shutdowns? Mabye they 
can be taken apart like the "new" NSTs that I remember hearing are 
relatively easy to put to our use. If it is something that's as simple as a 
current meter inside which shuts down when it detects a short, then it 
wouldn't be too terribly hard to seperate it from the part we are 
interested in. Bart, mabye next time you head up there you could ask about 
this?

Tesla list <tesla-at-pupman-dot-com> wrote:
Original poster: "Dr. Resonance"


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"
To:
Sent: Thursday, September 18, 2003 6:12 PM
Subject: Re: Mini-coils?


 > Original poster: Chris Roberts
 >
 > 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/ If you
&g!
t; 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 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
 >
 >
 > Do you Yahoo!?
 > Yahoo!
 > SiteBuilder - Free, easy-to-use web site design software
 >
 >
 >



-Chris