In short, this controller sucks. The knob doesn't bounce, so try rotating it one "click" and it moves 10 steps. In addition, the PWM functionality is highly non-linear and depends on the switching frequency. Essentially you need to estimate/measure the output voltage in % as the "50" shown is not 50% of your input voltage at all. "88" means 75% and "92" means 100%. Who wants 25% of their input range set to 4% of the controller's range?
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