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Let's call those potentiometers P1 (top), P2 (middle) and P3 (bottom). P1 and P3 act as the Reference Voltage supplies, high and low respectively. P2 is the Input Voltage. When physically designing this circuit , we might start out on a breadboard- having gathered pertinent data and worked through any and all equations we could foresee. At this stage potentiometers would be used to adjust and set a reference voltage high (Vr+) and reference voltage low (Vr-). The difference between these two voltages creates a 'window' that the inputs tied to P2 will monitor. Essentially, the heart of the circuit. Potentiometers however, are not necessary in the final build of the circuit. Having obtained the desired reference voltages and formulating a suitable window, we could replace each Pot with a couple resistors in a voltage dividing format. With attention to the correct ratio between each resistor set a defined by their respective potentiometers. Each Led is simply a visible representation of the individual output to which it is assigned. Remember that these outputs can be utilized as inputs our power applied to other circuits. I've introduced a sine wave merely for effect, to give life to the circuit and showcase it's operation. Enjoy...
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