This is a simple demonstration of an op-amp. It has two inputs, which you can control using the sliders on the right. The op-amp greatly amplifies the difference between the two inputs, and outputs the result. The output voltage cannot swing beyond the op-amp's high and low supply voltages (+15V and -15V in this case). The wires providing the supply voltage are not shown; instead, the high and low output voltage can be specified using the right-mouse Edit menu.

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