Adjust the two sliders on the left to change the input voltages to the circuit. The two input signal currents merge and flow together through the feedback resistor. The nominal gain for input 1 is -Rf/R1 and for input 2 is -Rf/R2. You can change the gain by changing the values of any of the resistors. 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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