[sdiy] Neutral ground [was: midi optocouplers]

[Grant Richter]

> Neutral should have no voltage with respect to earth ground.

With all due respect to Harry.

Neutral will sometimes show a voltage because of the resistivity of  
the copper and current flow.
With a heavy load running on a long line, I have seen 3-4 volts AC on  
the neutral line.

Of course Harry meant for the kind of current draws you see in a studio.