The internal circuitry for the UA741/LM741.
NOTE: THE SWITCH ABOVE THE POSITIVE VOLTAGE SOURCE MUST BE SET TO OPEN BEFORE SIMULATING. IT CAN BE CLOSED AFTER STARTING.
I don't know why, but for some reason EveryCircuit tends to goof up starting complex circuits. It works fine afterwards.
1Khz Sine: Non-Inverting Input (+)
2Khz Sine: Inverting Input (-)
Blue wire: Output
You can also see the headroom and slew rate in the simulation. Neat!
Based on:
https://upload.wikimedia.org/wikipedia/commons/thumb/e/e0/OpAmpTransistorLevel_Colored_Labeled.svg/500px-OpAmpTransistorLevel_Colored_Labeled.svg.png
