>But the chip will not be able to tolerate ANY voltage
>above 7V. Think about it. Even a surge can drive a
>5V unreg wallwart about 7V. Those selectable voltage
>ones are unregulated, and the "5v" selection is over
>7V. Try it.
>
>No, its a non-starter.

But most of the low voltage wall warts I have come across use a switching
supply - very viable in this application, which mean they have a stable
output voltage.

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