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rzn972
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Homework Statement
Find the input impedance.
Homework Equations
The Attempt at a Solution
Input impedance= R1. I don't get why we can ignore the other resistors.
Problem 2 :
Homework Statement
Find the gain of the system.
https://www.physicsforums.com/attachment.php?attachmentid=68909&stc=1&d=1398116979
Homework Equations
The Attempt at a Solution
Gain = 2
My professor wrote
vout= (R3/R2) Vin + vin = 2Vin, so gain =2.
I understand that (R3/R2) Vin is from the output of the op amp but I do not know where the other Vin came from.
Can someone explain this please?
Thank you so much!
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