I wrote:

>  >       How do you propose to turn off the SCR? Once it's latched
>  >       on, you can't turn it off (and if you're switching DC,
>  >       you need an auxilliary circuit that can reverse the
>  >       anode-cathode bias). It turns off when the current
>  >       through it drops to zero/reverses direction. Or is there
>  >       some significant technique involved that i'm not aware of?
>
        [snip]

        perhaps a LC tank circuit? and switch the SCR at
        the resonant frequency? *snicker* why didn't i
        think of that before? it's called a SCR-resonant
        converter. Or something like that. sorry folks.
        It's been a mentally draining week.

        -Phil