[sdiy] generate 0v from out of nothing..

[Nils Pipenbrinck]

This is somehow related to the pcb topic.. something just came into my mind:

Isn't there a old analog-guru trick to generate 0V from out of nothing? This
would help me a lot because my biggest problem with the pcb is the
ground-signal (which is used almost everywhere)-

I think about using a free opamp in my TL074. Just generate a voltage near
0V from V+ and V- with a voltage divider from the rails, and connect them
with the positive and negative input of a opamp. In theory this should give
me a nice 0V at the output, shouldn't it?

I've never did it.. maybe that thing begins to oscillate or so.. or it
outputs anything but not 0V.. Is this practical? (I don't put a big load at
the 0V. maybe 1 or 2 mA - just need it as a reference for other opamps).

Nils Pipenbrinck