Re: Super Small TC

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

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.
 >>
 >>
 >>
 >
 >