Powering hifiberry DAC with external linear psu


I'm currently using volumio 1.2b (with an i2s dac (ESS 9023) feed by an USB-is2 convertor (from diyink)). I'm quit happy but I hear so many good thing on the Hifiberry dac that I would like to make a try.

I just order one Hifiberry DAC and I would like to know if it is possible to power the DAC using a linear PSU rail (Vdc). I do not want to use the powering "pins" on the GPIO of the raspberry model B. why : because my GPIO is already loaded with many thing (LCD, IR and temp sensor).

From what I understood (emails exchanges with Daniel) the powering specifications are :
Digital part: 3.3V 50mA
Analog part: 3V 50mA

3+3.3 = 6.3Vdc. Not very common ?? is there by chance a range for powering the dac (i.e. like 3 - 10 Vdc, 50 mA) ...

Then, I get a bit lost : does this mean I have to solder, 2 pairs of cables (one pair for each voltage ?).

by looking on images of the Hifiberry dac (http://i1.wp.com/www.hifiberry.com/wp-content/uploads/2013/11/hifiberry-kit.jpg) I can see a 5V + and - signs (right side). Does this could be use for input (or it's just a relay from the GPIO pins ?).

Any input or advices for powering the hifiberry DAC using an independent externa psu unit are welcome.

Thanks for you good work, crazy-audio guys



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