Lazy Sunday afternoon project, a simple *PC817 OptoCoupler tester.
Two very simple ~5V circuits:
1) Quick check — push the button, LED on = works.
2) Test Circuit as mentioned in the datasheet for frequency / pulse behavior test.
Nothing fancy, but handy for sorting out good vs questionable parts.
Blog:
https://togo-lab.io/?p=153
Gitea:
https://gitea.togo-lab.io/tgohle/0002-PC817-Series-PhotoCoupler-Tester
