[sdiy] LED current source needed for 'digital' outputs?

[Florian Anwander]

Am 05.03.2014 02:06, schrieb Michael Zacherl:
> reading that thread and thinking of a flashy MIDI-controller and an
> USB-audio interface connected to the same bus makes me wonder how
> better usb-audio products manage to stay relatively silent.

My experience is: They don't manage it. As soon as the interfaces are 
USB-powered you will suffer a lot of digital noise via groundloops much 
likely. In our live impro-project we have forbidden USB-powered audio 
interfaces.

Florian