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Re: Triggered gap and safety gaps



Original poster: "David Sharpe by way of Terry Fritz <twftesla-at-qwest-dot-net>" <sccr4us-at-erols-dot-com>

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

Tesla list wrote:

> Original poster: "Ted Rosenberg by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <Ted.Rosenberg-at-radioshack-dot-com>
>
> Mike:
> I am close to the point of setting one up. Waiting on a part from McMaster.
> I plan to have the dimmer in a standard AC box and connected by a line cord
> to the cap and ignition coil (a remote config). However, I can assure you of
> one thing: I will NOT attempt any adjustment of the dimmer/T-Gap while
> anything is powered. Period. Ain't worth it!
>
> Safety First...Really!
>
> Ted
>
> Subject: Re: Triggered gap and safety gaps
>
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <CHURCHMON-at-aol-dot-com>
>
> Hi Johnathon and list ,
> I too am concerned that if I build one of these triggered gaps that I could
> get back
> lash from the tank circuit if I come in contact with the dimmer knob.
> Has any one else experienced any from these type of trigger circuits ?
>
> Thanks ,
> Mike Church(CHURCHMON)-at-aol