[sdiy] Using Opamps as INV or NON-INV amplifiers

[Aaron Lanterman]

On Wed, 21 Jun 2006, Ian Fritz wrote:

> At one point I worked out the equations for the general  case of arbitrary

Dave - check out my op-amp lectures:

http://users.ece.gatech.edu/~lanterma/ece4803/

on 1/23 and 1/30 - I thinkat some point I work out the general case Ian 
describes.

Another really powerful way to think about it is in terms of what's 
happening with the currents. The virtual ground in the inverting 
configuration is essentially letting you use a resistor as a voltage to 
current converter, and then the op amp with the feedback resistor is 
essentially turning that current back into a voltage. Thinking in terms of 
currents can give a lot of insight.

- Aaron