>It's also worth adding a diode between output and input (anode to 
>output, cathode to input). This extends the life of the LDO by 
>preventing charge in the output capacitors from trying to blast 
>its way through the FETs / BJTs in the regulator. IIRC it's 
>"highly recommended" in the Zetex datasheet, and "suggested" by ONSemi.

And standard in my circuits ...
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