ProtoDAC TDA1387 X8 project

[varunach]

The UcPi Universal Ultracapacitor power supply looks interesting. Since the ultracapacitors are preinstalled, that seems like a better value. The design is interesting or odd. It has the spring contacts for the RPi on the opposite side shown in the picture. So if you add your stack as described in the manual, the board would be flipped over (ultracaps on the bottom) and this also puts the ON/OFF switch as well as the green terminals on the bottom side. It seems better to use it as a standalone board without your stack mounted on it as designed. I guess the green terminal could be desoldered and moved, maybe the switch as well.

"Pi (any version), FifoPi Q7, ProtoDAC, and PurePi II with 5V going separately to Q7 and ProtoDAC" You meant 5V separately to RPi and ProtoDAC. Q7 requires 3.3V. This should be the better option of the two.

It's very nice that the clocks can be changed on MA.

@hifinet I pinged Gabster on diyaudio and he confirmed that the 3.3V to the ProtoDac (as shown in his video) did not work well, so he did eventually isolate 2/4 pins and connect 5V to ProtoDac between the RCA terminals. That confirms it.

I'm thinking I'll separate the RPi completely and build a DDC/DAC combo without a Pi. 

PurePi >> ReceiverPi DDC + Amanero 384 Combo for USB input >> FifoPi Q7 >> ProtoDAC

This way I can power the ProtoDAC from PurePi's 5V terminals and use the 3.3V terminals to power the Q7. I can still connect an RPi audio source or PC to Amanero if needed (or any other digital source for that matter). IanCanada sells some nice clocks (SC Pure) and the manual for the clocks say they need 3.3V clean power so not sure if connecting the MA to 5V supply will cause issues hence the reason to go with the above plan. Would love to hear thoughts.