Join Date: Nov 2000
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Re: Homemade DC welding rectifier working!
It's a semiconductor, similar to a diode in that it only flows current in one direction. It is different in that it has a third connection, called the gate, which must have positive bias in order for the scr to function. So, essentially, it's like a solid state relay, but it only flows in one direction. You can use it as a very dependable electrical switch, that operates at high speeds. They use them on power control circuits. Sorry, I'm not an electrical engineer, just a backyard mechanic, so that's as good as my explanation gets.
High current diodes are expensive new. You can sometimes get them or scr cheap if they are surplus or pulled from service. I'm trying to have fun and scrounge together something usefull on the cheap.