Electronic – Why the non-inverted amplifier does not work

amplifiernon-inverting

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?

Thanks,

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![Thanks for the explanations,
new circuit that I'll test]4

Best Answer

The datasheet will tell you what the common mode input voltage can be. From memory, you can't go closer than 4V above the negative supply and I think you need at least 10 V between the two supplies. You can use a wide range of resistors. Very low values may overload the op-amp output and very high values may lead to excessive phase shift at high frequencies, offsets due to input bias current, and high noise.

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