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Originally Posted by mogwai
You can use an opamp as a comparator. For this application I would use a single supply one that can run on 12 volts. As for the pot, use it to vary Vr with a voltage divider.
Get a breadboard and play around with this stuff, thats how I figured it out!
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Mogwai has a great suggestion. Get some of these parts, breadboard it up, and try it out. I think you'll learn a lot more than just trying it out on a simulator.