This circuit computes the integral of the input, that is, the output voltage changes at a rate proportional to the input voltage (but in the opposite direction). The op-amp tries to keep its - input at the same voltage as the + input (which is at ground). This requires it to draw a current proportional to the input voltage (V / 1000 Ω). This current flows through the capacitor, whose voltage is proportional to the integral of the current flowing through it.
This page is a utility for simulating интегратор (инвертирующий) на операционном усилителе online with specified initial values.









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