"David Looser" wrote in message
...
"Ian Bell" wrote

That sounds like a good idea.

It *is* a good idea. But it won't provide the discharge that seems to be
so essential unless you add a second triac.
(Actually, since this is DC, wouldn't a thyristor be more appropriate?)

David.



I can't now remember why I used a triac rather than a thyristor. A thyristor
will certainly do the job. It's possible that I just happened to have a
triac lying around! Long time ago.

S.