Or you could do this. Say you have a 5V line and you want it to range from, say, 2V to 4V, right? Put a resistor in the line to lower it to 4V. Then calculate the amount of resistance to lower it further to 2V. Find a pot close to that resistance, and then you'll be able to go from no resistance (4V) to full resistance (2V). Does that make sense?
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