Re: Power from another source fed to 1117 regulator output pin

On 9/30/2024 1:16 PM, Don Y wrote:

If *designing* in this sort of configuration, I tend to be more paranoid
about the types of "stuff" that will inevitably get connected to the
"input connector" -- especially if you opt for the ubiquitous "barrel
connectors".  There, it seems that the typical user just hunts for *an*
adapter (wall wart) that "fits", mechanically.  Consider that many such
devices are generic and don't even declare the device to which they
are *intended* to be mated (People's Wall Wart Company #773), the
user has very little by way of guidance.

A great use for pTouch labelers is to tag each such wall wart in
your home with a label declaring its intended mate.  I have
some with odd connectors (e.g., 4 pin) that come in two different
INCOMPATIBLE pin configurations.  So, "ONLY USE THIS ON XYZ DEVICE!!!"
to remind myself that the other devices with similar connectors
are not wired the same way (finding 12V on your 5V -- and 5V on the
12V input -- input tends to leave you with toast!)