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- Homework Statement:
- Find out the input impedance in a LM741 Op-Amp with open loop gain around 10E+6, and with non-inverting terminal receiving variable voltage and inverting terminal connected to output (Negative feedback)

- Relevant Equations:
- ##V_{out} = A_{v} (V_{+}-V_{-})##

In this case, there is negative feedback. ##V_{out}## is almost equal to ##V_{in}## in this case. But I really can't understand how to even proceed to find out the input impedance in this case, from the equation I know. Can someone help me out in figuring how should I proceed?