Hi I've built what is meant to be a non-inverting dc amplifier using a 741 op-amp (shown in attached diagram). Resistor values are: R0A= 470k, R0B= 47k. I am feeding the op-amp a supply voltage of 12v and an input voltage to the non-inverting input of 0.5v. According to the resistor values I would expect to get a gain of 11, giving an output of about 5.5v. However, the output is about 11.3v, and will not change with the input voltage; it seems to be jumping to around the +ve rail and just staying there - not a very effective amplifier! I've tried changing the op-amp, resistors, wires.... everything, to no avail. I'm really confused and can't figure out why I can't get such a simple circuit to work. Any suggestions would be much appreciated. Thanks!