![]() It isn’t connected to ground, yet in a properly configured op amp circuit it might as well be at ground potential. The output mysteriously will do what it can to make the inputs equal, as far as it is physically possible.Īs a corollary to the second rule, you can easily analyze the circuit shown here by thinking of the negative (inverting) terminal as a virtual ground.The inputs of the op amp don’t connect to anything internally.Last time I mentioned two made up rules that are good shortcuts for analyzing op amp circuits: Let’s take a look at an example circuit simulated with falstad. This corresponds to a 180 degree phase shift which can be useful in amplifiers, filters, and other circuits. That is a 5V input results in a -5V output (or -10V if the amplifier has a gain of 2). ![]() Sometimes you want an amplifier that inverts the signal. In the last Circuit VR we looked at some basic op amp circuits in a simulator, including the non-inverting amplifier.
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