Re: Super Small SSTC

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

Original poster: "Jim Mitchell" <Electrontube-at-sbcglobal-dot-net> 

Here's some photos of my EXTREMELY small SSTC.  It is overall .78" by 2" and
runs at 8.5MHz off a 13v supply to make 3/8" arcs.
http://www.hot-streamer-dot-com/electrontube/tintc

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, July 15, 2004 2:07 PM
Subject: Re: Super Small TC


 > Original poster: robert heidlebaugh <rheidlebaugh-at-desertgate-dot-com>
 >
 > Jim:
 >        Your project is valid.  The smallest Tesla I have seal was 3/8 inch
x
 > 33 in long I was given to reproduce and test. This was a commercial
project
 > requiring my technical input.
 >         The use of polypropylene is good. I use PE as it is lower
temprature
 > and easly vacuum casted into any shape.
 >        Fly back transformers put out 20Kv or more when powered by an
external
 > oscilator circuit made with a 2N3055 transistor and 2 added coils of 14T
and
 > 22T or you cam use the old fet from the circuit you took the flyback from.
 > If you try to use the original curcuit and windings you must use the
 > original voltages and current to make it work, This makes the project more
 > complex. Just ese the secondary coil and ground. disregard all the other
 > windings and use your own added windings in a crude feed back ascilator,
or
 > use your windings center tapped and 2 transistors in a free running
 > multivibrator if you are tuned to the digital world not analog. both work
 > well.
 >        Robert      H
 > --
 >
 >
 >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  > Date: Sun, 11 Jul 2004 09:18:39 -0600
 >  > To: tesla-at-pupman-dot-com
 >  > Subject: Re: Super Small TC
 >  > Resent-From: tesla-at-pupman-dot-com
 >  > Resent-Date: Sun, 11 Jul 2004 09:25:43 -0600
 >  >
 >  > Original poster: "Jim Mitchell" <Electrontube-at-sbcglobal-dot-net>
 >  >
 >  > I did this a while ago,  with a 1" by 1" secondary.  I ran it spark gap
at
 >  > first,  then converted to solid state.  You can see it here
 >  > www.hot-streamer-dot-com/electrontube/micro.
 >  >
 >  > Regards - Jim Mitchell
 >  > ----- Original Message -----
 >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  > To: <tesla-at-pupman-dot-com>
 >  > Sent: Saturday, July 10, 2004 11:52 PM
 >  > Subject: Super Small TC
 >  >
 >  >
 >  >> Original poster: "Chris Fanjoy" <zappyman-at-hotmail-dot-com>
 >  >>
 >  >> I'm not sure whether this project was a waste of time or not. I had
set
 >  >> aside work on my big coil because I can't afford a good pulse cap
right
 >  >> now, but I thought I'd try something else in the meantime. I had
purchased
 >  >> a large spool of #38 AWG magnet wire, for reasons which I can't even
 >  >> remember, and I wondered if I could use this to produce a super-small
 >  > tesla
 >  >> coil. So I set to work to wind the smallest TC secondary possible, and
in
 >  >> less than on hour this is what I had produced: approx. 450 windings on
a
 >  >> 1/2" wide, 2" long paper tube - with no breaks or overlap! According
to
 >  >> various TC calculating tools, the resonant frequency was quite high -
 >  >> somewhere in the 4 MHz range. So I built a small flat-spiral primary
(#16
 >  >> AWG) and a proper-sized tank cap - which only required three small PPS
 >  >> (poly-phenylene substrate, I think) caps. For a power supply, I used
an
 >  > old
 >  >> TV flyback transformer and set the spark gap to about 3kV. With!
tuning,
 >  >> the best spark I could get from the secondary was about 1/16" (with no
 >  >> topload). Obviously there are some problems somewhere! As a newbie I'd
 >  > love
 >  >> to know where I went wrong, though I'm sure there are plenty of errors
in
 >  >> this unusual design. The first thing I'm thinking is that a
flat-spiral
 >  >> primary isn't right for a coil this small, and maybe a helical one
would
 >  >> work better.
 >  >> Any advice would be appreciated.
 >  >>
 >  >>
 >  >>
 >  >
 >  >
 >
 >