what the....about Opamps...

[Gibson486]

just had a phone interview....they asked me a question about opamps (yes, solve a circuit over the phone, fun stuff)....

basically (as he described over the phone), it's a opamp with two resistors hooked to the negative terminal that is hooked to the output. What is the gain? Bosth resistors are equal.

He says it's 2. How is it 2?

 

[CStan]

hmmm... isnt it (R2/R1 + 1). I'm tired.

 

[maximus maximus]

Originally posted by: CStan
hmmm... isnt it (R2/R1 + 1). I'm tired.

Yes it is. Rightly said. It is (r2/r1 + 1) in this case. In the vide verso case it is -(r2/r1)

Max.