Linear power supply for Pi3 and Hifiberry Digi+ - diyAudio
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Old 29th April 2016, 06:35 PM   #1
tboooe is offline tboooe  United States
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Join Date: Oct 2006
Default Linear power supply for Pi3 and Hifiberry Digi+

I want to run both my Pi3 and Hifiberry Digi+ off a linear supply to see if it makes any difference in sound. My intention is to try powering both the Pi3 and Digi+ off a single power supply and then try powering the Pi3 and Digi+ separately. I just want to doublecheck with this forum before fry something.

Powering both Pi3 and Digi+ from same linear power supply:

All I need to do is supply 5V to P3 on the Digi+ board from power supply #1? This would supply power to both the Pi3 and Digi+. As I understand it, the Digi+ also needs 3.3V so it will still be able to get this from the Pi3 converting the 5V I am feeding it through the Digi+?

Powering Pi3 and Digi+ from separate power supplies:
I understand that the Digi+ needs both 5V and 3.3V. I need to still supply 5V to P3 on the Digi+ board. Do I then supply 3.3V to pin 1 of the GPIO on the Digi+?

I then need to cut pins 1, 2, 4 from the GPIO header on the Pi3 so that I am not providing power to the Digi+ board from 2 different power supplies. To power the Pi3, I just need to plug my power supply #2 into the micro usb port.

Thank you in advance for the help.
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Old 30th April 2016, 12:29 AM   #2
Odal3 is offline Odal3  United States
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Join Date: Aug 2014
Maybe you can get some clues here: Hifiberry DAC+ Pro - HW mods anybody?
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