Introduction: Variable Power Supply

About: I am a Senior in college studying Mechanical Engineering. My interests include woodworking, 3D printing, electronics and building computers
Didnt see that anyone had done this so decided to put it on.
I use a model train train transformer as a variable power supple, i have it marked along on the top so i can see what voltage im at without measuring it, also you are easily able to reverse the polarity by going the other way