I'm planning to use iFi iPower 5V external power supply to power my HifiBerry Digi Pro HW 1.2 directly together with my RaspberryPi. With this I'm trying to improve the quality of sound a bit.
I'm connecting to my Amp/DAC by optical cable as it does not have Coax cable.
The only thing I need to do, is solder a print header/cable/etc in P3 connection and connect iFi iPower directly? This would power both HifiBerry and Raspberry Pi?
In P3 connection which one is negative and Positive?
Thanks in advance!