Re: Need TSG help

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

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi Steve

Interesting work, I presently work on a DC supply too, I set it a
side for now because I want to test some idea for TSG. The SPDT
switch is in my mind for future experimentation. Two thing you
could try first; put a distance between the two TSG, if you think
about a Marx generator you see that a spark gap have an influence
on other spark gap ( ultraviolet, field distortion???, may be
some other influence too ).

More farther.   

Tesla list wrote:
> 
> Original poster: "S & J Young by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<youngs-at-konnections-dot-net>
> 
> To TSG Engineers & experimenters,
> 
> I need some advice.  I have a 15 KV DC supply which charges a series
> connected primary LC tank circuit via one spark gap, then discharges the
> tank LC via a second spark gap.  Basically, it is a SPDT switch.  The RSG
> version of that I call the Deanogap which I have described in previous
> posts.  It works really well and no power wasting series resistor or other
> ballast is needed.
> 
> I tried replacing the RSG with two TSGs, alternately fired by two HEI coils.
> Each TSG is three copper pipe couplings, with the trigger applied to the
> center one through 5 .001 mF 10 KV caps in series.  The center electrode is
> biased at mid-voltage by resistor strings.  The circuit is +7.5 KV to one
> TSG and - 7.5 KV to the other TSG.  The other ends of the TSGs are connected
> together and to the tank cap.  The other end of the tank cap connects to the
> primary.  Finally, the other end of the primary goes to the -7.5 KV.

May be because the two TSG are connected together, when the
charging one fire it could cause a rise in the voltage and
causing the second TSG discharge ( I think when you charge a
small cap from a big one across a small resistance the SG you
will have the same kind of oscillation than when you discharge
your cap in the primary causing in the second gap over voltage ).
I try, but for now, I can't find a practical solution. Try to put
a distance between your two TSG, block the light from one TSG to
the other and may be it's possible to use a kind of snubber in
your charging TSG??????????

Cheers,


Luc Benard   

> 
> Here is the problem.  When one of the TSGs fires, it immediately causes the
> 2nd one to fire.  Both of them firing at once is really bad news!  It
> results in a deafening, frightening BANG!! as several hundred Joules of
> reservoir cap energy is discharged through the two TSGs in series!  Very
> hard on caps, power supply and my nerves, and no energy makes it to the
> secondary.
> 
> I suspect it will be difficult to impossible to prevent this from happening,
> but I thought I would try the wisdom of the list before abandoning the
> design.  Any ideas on how to prevent each TSG from causing the other one to
> simultaneously fire?
> 
> --Steve