Jan,
the OM4TI service manual actually claims the X-sync is good to 500V.
Since the energy in the flash sync circut is limited by the energy stored in
the flash trigger
cap, 10's of nF in old high voltage flashes, and a rather small superimposed
charge current
typically 10's of uA, even if you exceeded the scr voltage it would likely just
trigger itself
(and the flash) and remain undamaged. To put in perspective, even a small scr
is usually rated at
0.8-1A continuous and many times that peak at a low rep rate.
Tim Hughes
--- Jan Steinman <Jan@xxxxxxxxxxxxxx> wrote:
>
> > From: Tim Hughes <timhughes@xxxxxxxx>
> >
> > Actually if you check schematics, the high voltage on the 2s, the
> > 4T etc goes through a small SCR
> > not an IC, so safe up to ~400V.
>
> How did you determine the forward breakdown voltage? Put it on a
> curve tracer? :-)
>
> Some SCRs are rated as little as 50V.
>
>
> :::: If they can get you asking the wrong questions, they don't have
> to worry about the answers. -- Thomas Pynchon ::::
> :::: Jan Steinman, EcoReality: http://www.EcoReality.org/wiki/
> User:Jan_Steinman ::::
>
>
>
>
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