Re: Need TSG help

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

Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-qwest-dot-net>" <bert.hickman-at-aquila-dot-net>

Steve,

One other thought - add "sharpening gaps" in series with the trigger
electrodes to allow the trigger electrodes to more rapidly "float" with
main electrode swings. By using hard trigger pulses, you may be able to
overvolt the sharpening gap and the desired TSG, and yet handle the rapid
swings when the opposite gap fires without false triggering...

-- Bert --
-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman-at-aquila-dot-net
Web Site: http://www.teslamania-dot-com

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.
> 
> 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