I'm trying to build a circuit that uses a non-inverting op-amp to double the voltage in the circuit. The op amp I'm planning on using is: http://www.farnell.com/datasheets/2258629.pdf , and I think it needs to be set up in this configuration: https://upload.wikimedia.org/wikipedia/commons/4/44/Op-Amp_Non-Inverting_Amplifier.svg. My question is what should the value of resistance of these resistors be? I know they have to be equal in value but am unsure about the absolute size of the resistance.
For reference the voltage going into the op-amp will be between 0-5V coming from an Arduino Uno power rail and varied through a potentiometer.
Edit: The current circuit is as below, my thinking in response to the points raised about the voltage across the op-amp, is to put it in parallel to the proportional servo valve, hence running it off the 24V supply. My concern is that the current in that is 0.5A, which I understand wont all go into the op-amp, but the data sheet says the op-amp has a 2mA max limit. Does it have a feature built in that stops it accepting more than this, or will it try to accept more than this if given the opportunity and I'll end up breaking it?