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Re: Mini-coils?



Original poster: Bart Anderson <classi6-at-classictesla-dot-com> 

Yes Chris,
I had it in mind to ask after reading Dr. R's comments. I'm not sure which 
day I'll make it up there, but I expect mid to end of the week.
Take care,
Bart

Tesla list wrote:

>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
>
>
>
>
>