RE: Triggered gap and safety gaps

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

Original poster: "Lau, Gary by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Gary.Lau-at-compaq-dot-com>

The ability to adjust the phase of a sync RSG or triggered gap for best
performance while the coil is running is extremely desirable.  But rather
than using optical isolation for the controls, wouldn't it be a whole lot
easier to simply extend the control shaft with a suitably long piece of PCV
pipe?

Gary Lau
MA, USA


> Terry, Ted, ALL
>  
> I think in lieu of the following posting, that the SCR - Variac controller
> I was
> posting a while back should be made available as a triggered gap
controller.
> The advantage is the unit can be optically isolated.  I much prefer that
> approach
> to turning a knob that might have a 5-10J impulse coming back into the
> ignition coil.  Bert Hickman posted awhile back about using a 500 pf
> (there-about)
> 30-50kV cap between trigger electrode and ignition coil to isolate from
main
> gap pulse.  The control circuit would be nothing more then a variable
> illumination
> on a CdS photo resistive element is series with back to back SCR's. 
> Isolation
> could be accomplished with a fiber optic at that rate.  Ted's comment is
well
> founded, we should avoid adjusting running coils, especially on the HV
side
> while the system is running.  One mistake could be someone's last.  Let me
> make several corrections, and I'll post the EDN circuit via Terry.
>  
> Regards
> Dave Sharpe, TCBOR
> Chesterfield, VA. USA