Re: DC TSG - It works!

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

Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>

Greg,

Because of the large blast of air from the vacuum cleaner which blows
through the TSG, nothing in the TSG gets hot - just a little warm to the
touch.  I think the vacuum cleaner motor gets warmer than any of the rest of
the TSG!   Let us know how your setup works out.

My gap handles less than 2 KW max.  It will be interesting to hear from
anyone who tries a TSG with 10 KW or more.

--Steve
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Sunday, December 30, 2001 10:51 AM
Subject: Re: DC TSG - It works!


> Original poster: "Gregory Hunter by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <ghunter31014-at-yahoo-dot-com>
>
> Hi Steve,
>
> Really neat report--cool news. I'm pleased you got the
> TSG to work with the filtered DC supply, because I've
> got a choke output DC supply on the drawing board
> right now, and have actually taken the first
> construction steps. Your report gives me an
> alternative to the ARSG.
>
> My question is this: how hot does the annular trigger
> electrode get? I'm asking because trigger electrode
> heat will influence my TSG design. Does the slotted
> holder rod get hot enough melt plastic?
>
> Best Regards,
>
> Greg
> http://hot-streamer-dot-com/greg
>
>
> --- Tesla list <tesla-at-pupman-dot-com> wrote:
> > Original poster: "S & J Young by way of Terry Fritz
> > <twftesla-at-qwest-dot-net>" <youngs-at-konnections-dot-net>
> >
> > Coilers,
> >
> > Today I bit the bullet and tried a variable
> > triggered spark gap (VTSG) in a
> > filtered DC powered TC setup.  It actually worked
> > quite well, which
> > surprised and pleased me greatly!  I will describe
> > the VTSG I built, then
> > the interesting results.
> >
> > DESCRIPTION:  My VTSG is a pair of 3/16 inch
> > tungsten electrodes spaced
> > about 3/8 inch apart.  The electrodes are held in
> > copper plumbing fittings
> > as described my recent posting.  The trigger
> > electrode is a 3/4 inch id
> > washer centered around the mid point of the tungsten
> > electrode gap.  The
> > washer has the inside edge sharpened to increase the
> > e-field and improve
> > triggering performance.  I suppose this
> > configuration is a field distortion
> > TSG.  The washer is actually a 1 inch to 3/4 inch
> > "reducing washer" used for
> > reducing the size of a conduit opening in an
> > electrical box.  I soldered it
> > in a slot in the end of a brass rod which inserts in
> > the perpendicular
> > electrode holder.  The ring is held at mid-potential
> > of the main gap by two
> > strings of resistors, and is driven through five
> > .001 mF 10 KV caps in
> > series.
> >
> > Allegedly this sharpened ring configuration should
> > perform better than the
> > TSGs used by Marc and others which have a third
> > tungsten electrode
> > perpendicular to the main electrodes.  The annular
> > sharp edge is supposed to
> > induce multiple spark paths.  I viewed my gap in
> > operation through a welding
> > glass, and it does appear that more than one arc
> > occurs.  Whether I am
> > seeing parallel arcs or a series of single arcs
> > jumping around, I can't
> > tell.  The main arc passes through the ring without
> > connecting to it.  This
> > is a nice feature as you don't have to worry about
> > the trigger electrode
> > eroding or melting.
> >
> > I drive the trigger ring with a HEI coil driven by
> > 12 volts switched by a
> > power transistor.  The power transistor is driven by
> > a 555 with a fixed
> > pulse width of about 1.1 ms.  This width prevents
> > the ignition coil from
> > saturating and allows high BPS.  This is driven by
> > another 555 in a variable
> > oscillator configuration.  Actually, the oscillator
> > is running at 1000 times
> > the BPS, and drives a divide by 1000 circuit.  This
> > lets me monitor the
> > oscillator frequency with my Wavetec 27XT reading
> > KHz instead of Hz.  This
> > provides more accurate readings of BPS.  Output BPS
> > goes from about 1 to
> > 1000 in two overlapping ranges.
> >
> > The circuits are posted at Greg's Garage site under
> > "Power supply ideas from
> > Steve Young".  http://hot-streamer-dot-com/greg/  These
> > circuits show a
> > two-channel setup - just throw out the stuff for the
> > second channel (was
> > originally for a SPDT type TSG which didn't work.)
> >
> > I couple the output of a small Hoover canister
> > vacuum cleaner to a half inch
> > PVC fitting spaced close to the gap.  The air blows
> > through the gap at about
> > 45 degrees to avoid toasting the trigger ring.
> >
> >
> > --Steve
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
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