Re: The ISSTC

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

Original poster: "Steven Ward" <srward16-at-hotmail-dot-com> 

Yeah, radioshack clip leads have some sort of insulation that when HV hits 
it it glows bright red.  So far i have only had 1 strike to the primary 
coil (thats when i realized i did in fact need one!) but it did not damage 
anything.

Steve


>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com
>Subject: Re: The ISSTC
>Date: Mon, 12 Apr 2004 12:51:29 -0600
>
>Original poster: "Jim Mitchell" <electrontube-at-sbcglobal-dot-net>
>
>That was the red insulation on the ground wire.  The streamer was striking
>the ground wire not the base.
>
>Regards - Jim Mitchell
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Monday, April 12, 2004 9:53 AM
>Subject: Re: The ISSTC
>
>
> > Original poster: Brett Miller <brmtesla2-at-yahoo-dot-com>
> >
> > Steve,
> >
> > Ok, that was just amazing!!!  I don't even know what
> > to say.  What was that intense red glow (in the second
> > video) when the arc made contact with your wooden
> > base?  Was it actually wood being vaporized, or a
> > reflection off the secondary?  It was hard to tell.
> > Your secondary diameter to arc length ratio is
> > phenominal.  Excellent work.
> >
> > -Brett
> >
> >
> >
> > --- Tesla list <tesla-at-pupman-dot-com> wrote:
> >  > Original poster: "Steven Ward"
> >  > <srward16-at-hotmail-dot-com>
> >  >
> >  > Hey everybody!
> >  >
> >  > Ive been holding out on the tesla list.  Anyway, i
> >  > "sorta" came up with a
> >  > new breed of SSTC (mucho thanks to Jimmy H.!!!).  Be
> >  > careful though, it
> >  > doesnt look like a SSTC:
> >  >
> >  > http://www.hot-streamer-dot-com/srward16/I_SSTCnew.htm
> >  >
> >  > I dont think any amount of explanation will answer
> >  > all questions, but i
> >  > will briefly explain whats going on.
> >  >
> >  > Basically its your normal H-bridge driven SSTC.  Now
> >  > to make it exciting,
> >  > we throw in a tank cap thats tuned to Fres with the
> >  > primary.  Now we have
> >  > very low surge Z, so we can pump insane amount of
> >  > power into the tank (my
> >  > coil is probably seeing about 500A peak at worst at
> >  > about 6kv on the
> >  > tank).  To handle the high currents we use good
> >  > IGBTs and drive the gates
> >  > at 30V to lower the Vce drop.  My MMC is made up of
> >  > 18 caps (.15 2kv) in 3
> >  > strings of 6 total (75nf 12kvDC).  The burst length
> >  > ( the time im driving
> >  > the tank ) is only 170uS with several mS inbetween
> >  > (depending on where i
> >  > set the bps).
> >  > The current draw can be as little as 4A (low BPS) or
> >  > as high as 10A
> >  > (screaming bps) at 240VAC input.  There is 3000uf of
> >  > filtering to supply
> >  > high current to the bridge on demand (i could use a
> >  > bit more filtering though).
> >  >
> >  > I lost a few IGBTs at 240V before i added TVS and
> >  > zeners on everything, now
> >  > it runs solid.
> >  >
> >  > I need to build a cage around the electronics, im
> >  > very lucky it didnt zap them!
> >  >
> >  > Enjoy!
> >  >
> >  > Steve Ward
> >  >
> >  >