Review on Adjustable Regulator Generator PEMENOL Controller by Jesse Wells

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?