Your Prime directive
Adjust the output up (Vo+) or down (Vo-) so that Vn EQUALs Vp!
Your World
You have NO direct knowledge of Vo, R1 or R2,
You can OBSERVE Vp and Vn.
You can ADJUST Vo up or down.
External Circuit World
R1 and R2 deliver a portion of Vo to Vn: B = R1/(R1+R2)
This "tricks" op amp into a gain from Vs to Vo: K = 1/B = (R1+R2)/R1
Try it!
Hit "Start" and try to achieve Prime Directive.
Then click "Show Vo".
What happened, did you and R1,R2 create a signal gain?
Try a different Vs, R1 or R2 - can you predict the outcome?
Hit "Start" and see what happens.
Share your feedback and thoughts!
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