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

[David G Dixon]

> Yes, *in principle*.  But unless you build your circuits 
> using cooled superconductors for all your grounds then they 
> *will* have non-zero impedance.
> 
> Maybe you've been lucky.  So far.  But as an academic I'm 
> sure you're aware of the problem of induction.

Yes, I've been bitten by that bug a couple of times, as well as stray
capacitance between long traces.  But, so far, no ground problems per se
(touch wood).