Am 13.11.2011 um 18:15 schrieb Dan Snazelle: > Not input to ground....input is on pin 3 + , with a wire between pins 1 and 2, ground on pin 4 > > > Supply=10v Sounds fine to me. What about the other opamp in the TLC272? Was it unconnected? Maybe you just got a bad chip? Did you try another one? Ingo