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Ok so let me see if I am tracking this rightWhen selecting a fuse and thyristor pair the fuse should be above the current draw level of the circuit and the thyristor should be able to output a current level high enough to blow the fuse. And the the schottky diode needs to be rated high enough for the circuit current as well.
I was reading that earlier. Interesting. Current is being drawn from arcade boards. They vary in current requirements and some are very high. My goal is really to make sure no one is able to put the wrong voltage in and damage their equipment. I had my buck converter circuit fail and 12v got shot through the 5v line. It fired my arcade board, cables (ther have a built in rgb to ypbpr converter) and the game pcb attached to it.