This circuit outputs the voltage difference between two input signals. In this case, the first input is a 60 Hz signal, and the second input is a 60 Hz signal with a 120 Hz square wave added. (In this simulation, the two signals are added simply by connecting two sources in series, which is convenient but unrealistic.) The second input signal drives two resistors that act as a voltage divider, and the op-amp's + input is connected between them, where the voltage is half of the second input signal. The op-amp tries to keep its - input at the same voltage as the + input. The two resistors at the top act as a voltage divider, placing the - input midway between the first input signal and the op-amp's output. If V+ = 1/2 In 2 = V- = 1/2 (In 1 + output), then output = In 2 - In 1, or the difference between the two inputs.
This page is a utility for simulating дифференциальный усилитель на операционном усилителе online with specified initial values.
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