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OpAmps will do anything to keep their input voltages equal to each other, and that includes pulling current from the ground or pushing current into the ground. For opamp circuits, you have to include the ground node in your KCL analysis! It's weird at first, but you'll get used to it. On Problem 8 of Homework 6, notice the labeled current (io) at the bottom of the circuit travelling into ground. This is different than what we have seen before, so I just wanted you to be aware of it.
The demo circuit linked above is a simple headphone amplifier based on the classic CMoy project found here: https://tangentsoft.net/audio/cmoy/
For an analytical example of a similar circuit, solve the second problem here: http://www.calvin.edu/~svleest/circuitExamples/OpAmps/
P.S. For opamp circuits, Node Voltage Analysis is usually easiest. And you can write OpAmps any way: opamps, op-amps, operational amplifiers, OpAmps, etc. It's all the same thing.
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