A couple of days ago I had a 7805 regulator fail and stick
14V up a circuit, taking out an F877 and an LCD. To quote
my old French boss " I em 'ow you say ? urn'appy "

What can I use as a shunt circuit to stop this 'appening
again ? I've seen various semis used (SCR, FET, BJT)
with dividers, zeners etc but know that this list always
comes up trumps. I've tried the rest, now I want to try the
best

Generally I'd want this to protect a circuit that needs 5V @
100mA or less, which is probably not enough to blow a
common fuse, but should be sinkable by a modest semi.
Failure indication by LED would be nice

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