look at
http://www.chem.uoa.gr/applets/Apple...xt_OpAmps2.htm
http://www.allaboutcircuits.com/vol_6/chpt_6/6.html
http://webpages.ursinus.edu/lriley/r...html#fig:opint


and ... LMAO!!! a really quik one
http://lhcb-elec.web.cern.ch/lhcb-el...s/00000031.htm