Hi,
Thanks for the link, I'll check it out.
Actually I want to have it act as a comparator. In a normal scenario, I would probably use an atmega's comparator for this. However the end project is based on an MCU that has built-in opamps and no comparators..
While playing with it, I changed it to have a negative feedback, and I could see it operating as an amplifier. That's something cool, and I'll tuck it away for the future.