X-6

X-6 series | resources

(Naimly) Components:

The Box

case: Naim shoebox replica

power socket: something like that

din socket: Deltron 5P

usb brackets: this one needs a major PI hack, this one is plug&play

network extension cable

front switch: on-off-(on) - the push (on) resets the PI, the upwards on deactivates the HDD

green led, ø 5 mm

PSU

transformer: Nuvotem Talema, 2x9V@80 VA, open (rs-components #2237951) or enclosed (#2238645)

bridge rectifier: CB806 (farnell #9381341l) or schottky if you'd like

reservoir caps: 2x Kendeil K05 10000uF @ 40V or 63V from ebay

CRC resistor: wirewound ~2 ohm @ 5+ watt

Regulators

for the PI: 5V single or tracking preregulator or a LM317 from ebay

for USB: 5V single or tracking preregulator or a LM317 from ebay

for the DAC's digital section: 3V3 tracking preregulator or single reg w/ booster

for the DAC's audio section: 5V SuperTeddyReg

Wiring

star ground: although using only 50% of the transformer's power this is a naim PSU style arrangement - all grounds (0V) join at one point near the reservoir cap. 

Hacks

Although most of the connections can be solved by minor modifications of various USB cables some have to be soldered. A minimum requirement is the +5V & +3V3 isolation of the DAC (see below) and the power of any hungry USB device which can be achieved by simply connecting the red wire of the USB cable to a 5V regulator (ground will run thru the PI). Most DACs have holes to connect +5V & +3V3. Argain, ground will run thru the PI.

If you want to "hard wire" everything here's how we do it: 

PI: on the PI's GPIO cut pins (1,4,17) so that the DAC isn't connected to the PI's positive power rail. Pin 2 & 6 can be bended 90º to the outside to be used for 5V and ground (0V) connections (on the DAC some of the GPIO plastic has to be removed therefore)

USB: opening the back of the USB sockets one can cut and isolate the +5V of the upper USB slots.

DAC: hifiberry DACs have a "+5V" hole where the 5V AVDD can be connected to. A 3V3 soldering point has to be found. IQaudIO has extra holes for the entire GPIO so there it's easy to connect 5V and 3V3.

3D:

see attachments