Poncho D3 "n/a"

Just leave it out, don't install anything in that spot.

It won't hurt anything if you do install a 1N4001 there, but it's not necessary.

This was one of the first PCBs I ever made. At the time I had never used a series polarity protection diode so I designed the board to handle series or parallel protection just in case there was an issue (or if I didn't have a Schottky diode on-hand at the time)...
 
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