[sdiy] Buffering 0V when using a pot as a voltage divider?

[David G Dixon]

Well, if you take ground from an opamp, then the impedance is certainly low.
After all, ground is really just a source/sink of electrons at 0V, so it
shouldn't matter how you get it.  They only issue is not to exceed the
current rating of the opamp.

> I'd actually prefer to buffer ground and use that buffered 0V for stuff
that draws a substantial or varying amount of current - perhaps pots, LEDs,
etc - in order to pull that current from the supplies instead, and keep the
ground cleaner. I guess it would balance the positive and negative supply
currents, and minimize the current from the ground connection, which I guess
could be a good issue in many ways. In the simplest case, all needed is an
extra OP-amp. Any drawbacks on that? :-)