In article , Ted Edwards says...

The zener and SCR sounds like it may be the ticket.

See my post elsewhere in this thread. That doesn't work.

A zen(n)er alone obviously won't work. That plus an
SCR to switch the current sounds almost plausible....

Jim

==================================================
please reply to:
JRR(zero) at yktvmv (dot) vnet (dot) ibm (dot) com
==================================================