/diy/ - Do It Yourself

>>1478762
What was cut for the first 5 rules? If there's room LCSC could be added to the part sourcing, though Octopart should probably have a higher priority since it links to Mouser and the rest already.

I guess I'm a little stuck on the "it goes in your wallet" angle, where wallet space is valuable. Those credit card multitools have always looked either too flimsy or too bulky, with little practicality to either, but an NFC key could fit pretty well.

A credit-card PCB AM (energy harvesting or crystal-style) radio might also be possible, which is an interesting thought. A coil for the antenna, handful of passives, and perhaps some sort of headphone jack that's made of plated thu-holes partially open to the side of the card (pic). Though I'm unsure how tuning would work for the crystal (no IC) variant. A rotatable piece of shimstock or FR4 pinned atop (or inside) the PCB? A long thumbscrew into the side of the card surrounded by vias (pic)?