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Weird noise from RPi w/ DAC+ Pro

Hi,

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?

Thanks

Anirban

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