I am using the DAC+ Pro with RPi1 B+ and OpenELEC 7.0.1. I have a separate LM7805 LDO for DAC+ and the RPi is powered from the GPIO header pins.
I can hear noise like flutter and rustle when Kodi starts and weird hiss when I scroll the mouse.
This noise goes away completely when I power the RPi via the micro-USB power port.
However, my enclosure does not bring out the micro-USB power port.
Is this a ground bounce issue between digital and analog grounds?
Is this due to powering the RPi via the GPIO header? I have 470uF between the 5V and GND header pins.
Should I get a separate power supply (separate at the AC mains) for the RPi?