you reduce resistance in order to increase the voltage. so you spin the variable resistor, spinning to reduce resistance will increase voltage. i don't know what the corresponding resistance is though for certain voltages, i just measured the voltage doing one turn at a time until i got the voltage i wanted. I fired up the system, checked the voltage, when i wanted more voltage, i turned it off, spun the resistor and then fired it up again to see what voltage change i saw. After you do a bunch of turns, the voltage starts to increase more rapidly.
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