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Yep, absolutely, I thought the +/-ve inputs of the op-amp are interchangebly for use but it isn't !

I used two configurations:

[ATTACH=full]198071[/ATTACH]

It seem to be working with almost unity gain.

In the laboratory, it won't be practical to use three or four power supplies to provide seperate voltages to run only one bench.

Also, using a voltage divider is using many resistors, even the students won't understand it.

I think to do this experiment with a good setup, I think using a transformer with multiple outputs with the required DC rectification would fit this application.