I am trying to understand whether some opamps I've got (different makes and types) are good or faulty.
Thing is, if I test them on the breadboard in a buffer or non-inverting amplifier configuration, the output is as expected.
However, if I simply supply power to the opamp but leave all other pins disconnected, there is voltage on the output pin of the opamp (e.g. 5.9V).
This seems to be the case for all the opamps I have doubts about their health.
Furthermore, for one of these opamps (which is a dual opamp package), one of the output pins does put out voltage with all input and output pins disconnected, while the other output doesn't (put out voltage).
Are these opamps good or not?
Thanks!