Re: Triggered gap

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

Original poster: "Jon Tebbs by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jgtebbs-at-eos-dot-net>

Hi Marc, Shad & all,

Just a heads up on this thread regarding the _resonant_ problem. By
selecting an LTR cap value one can avoid the problem
_and_ use AC. The synchronous dimmer trigger even allows one to adjust the
firing phase for an LTR condition.
-- 
Jon G. Tebbs
<jgtebbs-at-eos-dot-net>


Tesla list wrote:
> 
> Original poster: "Metlicka Marc by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <mystuffs-at-orwell-dot-net>
> 
> shad,
> i agree with the train of thought, but you forgot that the safety gaps
> should fire far before the voltage reached this catastrophic condition.
> at least mine seem to? i would hate to scare people away from trying the
> triggered gap because they don't understand or want to run at dc. with
> the fritz filter and well set safety gaps, my nst has withstood about
> 1/2 hour of run time including a couple times i flipped the nst's power
> on before the trigger.
> 
> marc m.
> 
> Tesla list wrote:
> >
> > Original poster: "sundog by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <sundog-at-timeship-dot-net>
> >
> > Hi All,
> >
> >  A note here that some may overlook,
> >
> >  A triggered gap basically waits for the user to fire it (by turning on the
> > dimmer).  So it's holdoff voltage is higher than the peak voltage of the
> > circuit, else it would just be a plain static gap, only set very wide.  I
> > *highly* recommend running DC to the cap for this, to eliminate the dangers
> > of resonant rise.  if you run a resonant setup on a triggered gap and your
> > dimmer cooks from kickback, the voltage will skyrocket till the tranny or
> > cap bites the Big Electron.  If you're running DC, it'll only charge to the
> > tranny's peak voltage and then sit there patiently waiting.  The diodes
> > shold be suited for handling the kickback of the trigger voltage (my 40kv
> > diodes have held up fine so far).
> >
snip
>                                       Shad
> >
> > > -----Original Message-----
> > > From: Tesla list [mailto:tesla-at-pupman-dot-com]
> > > Sent: Thursday, April 19, 2001 1:58 PM
> > > To: tesla-at-pupman-dot-com
> > > Subject: Re: Triggered gap
> > >
> > >
> > > Original poster: "Alex Crow by way of Terry Fritz
> > > <twftesla-at-uswest-dot-net>" <alexcrow-at-blueyonder.co.uk>
> > >
> > > Stop!
> > >
> > > Do not run your transformer and cap together without them
> > > connected to a
> > > coil! The reason you are jumping 1cm is due to resonant rise,
> > > which is
> > > ringing up the voltage on the NST - you risk it arcing over
> > > and destroying
> > > it, plus the caps!
> > >
snip
> > >
> > > Cheers,
> > >
> > > Alex
> > >
> > >
> > > On Thursday 19 April 2001 15:20, Tesla list wrote:
> > > > Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> > > > <Hhchicken1-at-aol-dot-com>
> > > >
> > > > Hi list!
> > > > I have decided to make a triggered spark gap to replace my
> > > current 'vice
> > > > and a nail'.  I thought I'd better post to the list before
> > > I fry myself...
snip
> > > > Thanks for any help you can give me - a schematic would be
> > > handy hint hint
> > > > :) Henry Hallam
> > >
> > >
> > >
> > >