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Originally Posted by Vector86
That looks very simple, I could throw in a rheostat instead of that resistor to get the variable time control. What type of comparator did you use? I don't know what values to use to get the time I want though.
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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!