ESD, was : RE: [sdiy] midi optocoupler isolation voltage?

[Michael Buchstaller]

On Mon, 10 Mar 2003 15:21:28 +0100, you wrote:

>I *think* that the two wire midi bus is shielded via
>copper mesh, that should be connected to the "ring" of
>the midi/DIN cable.
>Both devices should connect chassis ground to that.
>So no potential difference can build up between
>two pieces of midi gear in terms of DC.

No, Nonono !!!

This way i have seen it in various cables and equipment.
But the idea behind using the Optocoupers is actually
that there shall ba NO electrical connection between the
MIDI devices, to avoid ground loops and the such.

OK, of course one needs a common ground, but not via
the MIDI cable.


-Michael Buchstaller