I am replacing the stock controller board with a better control board allowing me to use it with a better cutting and engraving software called LightBurn. Some background details on this project… This is for a cheap Chinese K40 Laser Machine. Problem Statement: I have two DC voltage sources, where both can be from 0 to 5V, I want to compare the two and always select the lower input (and if they are equal then any source will do). Folks, I am not experienced and really need some help here please pardon my ignorance and inaccurate questions/comments/assumptions below (and also the crudely drawn circuit).
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