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

[Michael Zacherl]

On 4.Mar 2014, at 19:07 , Tom Wiltshire <tom at electricdruid.net> wrote:

> I drive the uP that's producing the PWM output and the LEDs from their own +5V supply.

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.
Let alone the dirt a computer (laptop) produces anyway.

Michael.

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