Re: Jim Mitchell SSTC help!

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

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

Again,   you're making claims that are based solely upon your opinion.

If you have a proper set up and a correct load for the driver chips (no 40nF
load from two gigantic IGBTs...)  They will drive it fine without being
interrupted.  Believe me,  I've done this a few times and so have others.

You're confusing the driver running non stop, with filtered DC to the
bridge.  Most people feed their bridge with mains that has been rectified by
a single diode.  This allows the output to have an off time in between each
mains cycle which reduces heating in the bridge and WILL make sword like
sparks. Note, www.hot-streamer-dot-com/electrontube/temp/sword.jpg  That's one
of my SSTCs running half wave rectified AC.

Again,  the interrupter makes the coil extremely loud and you will be
ultimately limited to pulsed operation if you finalize the set up in that
manner.

Yes you can mangle the board if you start cutting tracks and then want to go
back and repair them which would ultimately lead to a mangled board.

The reason you're burning up the chips when not interrupting them, is
because A) you're driving a totally out of rating load. B) you don't have a
proper set up.

You can't make claims of the sort without having something to back them up!
All you have said are things based solely upon opinion which doesn't help
anyone trying to build a solid state tesla coil.  Also the fact that Rick is
already sending me his board back for me to repair it makes these statements
more erroneous.

Regards - Jim Mitchell
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, June 22, 2004 10:34 AM
Subject: Re: Jim Mitchell SSTC help!


 > Original poster: Fucian-at-aol-dot-com
 >
 > Actually you are wrong on a few points.
 >
 > 1-The interruptor doesnt "mangle" the baord in any way?
 > 2-The chips burn up and die FAST with CW action, and do not produce
 > "swordlike" streamers in any way. Just a brush discharge. Maybe with a
 > hellishly beefy halfbridge and voltage doubler...
 > 3-Half wave DC isnt needed at all! The interruptor is just as amusing and
 > the effects are similar.I currently use 2 3500uF 500volt caps in a voltage
 > doubler and get VERY POWERFUL arcs. In fact, I beleive the interruptor is
 > the KEY to getting good results fromt his baords design. The UCC pair
 > really limits what can be done w/o one. I am now driving a FULL BRIDGE of
 > miniblock IGBTs and am doing great!They are rated at 20nF each as well.
 >
 > So in all, USE an INTERRUPTOR!It will make this work really well and with
 > just about any switching scheme.
 >
 > Matt
 >
 >
 >