yemi11
Newbie level 4
All sources writes the kirchoffs current law for the node between Rf and Ri (in picture) and and writes a relation between equations for opamp.
![invOpamp.jpg invOpamp.jpg](https://www.edaboard.com/data/attachments/55/55247-c4c544b9dc76c13b072780eb54d8d9ab.jpg)
that results in -Rf/Ri
But what actually opamp amplifies and multiply with 200000 or whatever ?
if Noninverting input is zero. Than,
A*(0-Vinverting)=Voutput (A, open loop gain..)
What is Vinterting ?
![invOpamp.jpg invOpamp.jpg](https://www.edaboard.com/data/attachments/55/55247-c4c544b9dc76c13b072780eb54d8d9ab.jpg)
that results in -Rf/Ri
But what actually opamp amplifies and multiply with 200000 or whatever ?
if Noninverting input is zero. Than,
A*(0-Vinverting)=Voutput (A, open loop gain..)
What is Vinterting ?
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