Hello all. I was just wondering if it is possible to use an inverting opamp configuration with feedback to regulate an output voltage V0 without the use of BJT's? For example, the following sketch: http://img411.imageshack.us/img411/2389/opamp.png [Broken] V0 = Vs * (R1-R2) /2R1 Mathematically, V0 seems to be independent of load resistance Rl (not shown in diagram) so in effect V0 is regulated (provided we are within the limits of op amp). My problem is that in every regulator example i have seen, a minimum of an Op Amp and a bjt is used. This gets me thinking that there must be something so wrong/bad with this single opamp regulator that it is never used. Any comments appreciated.