Comparator

When the position (percentage) of the wiper of potentiometer Rref1 is higher than the position (percentage) of the wiper of potentiometer Rref2, the circuit operates as an active high window comparator. When the input signal is higher than the reference voltage of the top comparator OR when the input signal is lower than the reference voltage of the bottom comparator the voltage at the output/load is high. Otherwise (when the input signal is between the two reference voltages), the voltage at the output/load is low. When the position (percentage) of the wiper of potentiometer Rref1 is lower than the position (percentage) of the wiper of potentiometer Rref2, the voltage at the output/load will always be high. This is due to the overlap in the active high output of the two comparators.