> > > how do you switch that SCR off?  Turns out, you switch
> > > a capacitor across the device which diverts the current
> > > around it for just a few micro(?)seconds and that's
> > > enough to turn it off.  Pretty impressive, I thought.
> >
> > Barry, the two-thyristor scheme was used extensively for horizontal
> > deflection and HV circuits before HV transistors were available. Try to
> > get hold of a Grundig color TV set schematic from about 10-15 years ago.
> > Maybe Roman has one. It's a neat scheme. Of course the theory is discussed
> > in contemporary application notes (from ITT and others).

Why not use igbt or powerfet? Cheep, have a ttl comp driver chip, you
can turn off anytime you want, etc.

udv
Csaba

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