I'm trying to use a TL081, for which I used a DC power supply regulated by MPL1303, to feed the TL081 and a Vin from a DAQ assistant giving an analog signal of 0 to 5 V. I tested the signal from the DAQ and the supply from the MPL and it is working well, but I'm not being able to read anything from the output of the opamp.
My questions are:
1) Should I set the power supply on the TL081 with +12 V on Vcc+ and -12 V on Vcc-, or can I set 0 V on Vcc-?
2) Can I use any value for the two resistors, because I want gain of 2, so R1/R2 = 1?
3) When measuring the output with a voltimeter, can I use any ground, or should it be the virtual ground?