Galvanic isolation with 2 wire current loops (4to 20mA, 0 to20mA or -20 +20 mA) is the norm in industrial applications where you have really long cables in harsh environments, and also no "voltage drop" so no signal loss over cable length. Long cable means that the driver must put out more voltage nothing else, so it works the same up to a limit.
Voltage inputs are much more sensitive to disturbance . A current input have typically 20 - 100 Ohm input impedance, so the disturbance must be powerful enough to drive significant currents. An 10000Ohm or 47000Ohm hifi input is much more likely to pick up stuff via the cabling. Galvanic isolation is also what you typically have in ethernet cabling I think ? -- Mnyb -------------------------------------------------------------------- Main hifi: Touch + CIA PS +MeridianG68J MeridianHD621 and assorted amps SiriuS, Classe' Primare and Dynadio speakers, Contour 4 Contour Center, and Contour 1.3SE for the rear ch. Rel Stadium 3 sub. Bedroom/Office: Boom Kitchen: SB3 + powered Fostex PM0.4 Miscellaneous use: Radio (with battery) I use a Controller various ir-remotes and a Eee-PC with squeezeplay to control this ------------------------------------------------------------------------ Mnyb's Profile: http://forums.slimdevices.com/member.php?userid=4143 View this thread: http://forums.slimdevices.com/showthread.php?t=82122 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/mailman/listinfo/audiophiles
