Adjust the two sliders on the left to change the input voltages to the circuit. The gain with respect to the two inputs can be changed by changing the two input resistors. When all the resistor values are equal, the output voltage is V2-V1. Resistor values much be well-matched for this circuit to work well. You can also change the differential input resistance (typically 1 to 100 Megohm) and and the open-loop gain (typically 50000 to 200000).
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