Voltage regulator with alternate voltage source...

dwight dkelvey at hotmail.com
Sat Apr 9 10:55:53 CDT 2016

Bill, surely you have a pile of 1N400x diodes someplace.
Put 6 in series, forward, between the input and supply.
That should ensure it is safe.
If the voltage is higher than 8 volts, it would mean there
isn't enough current to worry about.

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