Adrian Tuddenham wrote:

I've always had a nagging worry with that system. If an input overload
exceeds the total current being drawn from the supply rail, it will take
over from the regulator, pull the rail higher and put excessive voltage
on all the chips.

If it's a short pulse, it should go right through all the decoupling
caps. The decoupling caps should appear like a dead short across the
power line to AC.

If it's a lot of DC for a long time, I could see maybe it being an issue,
but it would have to be pretty catastrophic.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."