ProtoDAC TDA1387 X8 project

[hifinet]

Folks,
my Christmas gift arrived - Iancanada PurePi II 5V/3.3V Power Supply PurePi_II

I liked the sound of Moode with ProtoDAC so much that I have pulled my collection of MFSL/DCC/XRCD CDs and ripped them to FLAC to re-discover how wonderful moOde plays them on ProtoDAC. This software and hardware combo is nothing short of magical, thus Christmas money went to possible improvements of better power supply and poorman's reclocker - bought Innomaker DAC HAT to reclock.

I carefully read Ian's manual and there is something that confused me. I wonder if anyone is using Iancanada's PurePi II with ProtoDAC combo.

To use Iancanada power supply but without Iancanada's reclockers, I wonder if I can even use his power supply without cutting pins 2,4 on the stack spacer before connecting any HATs to Raspberry Pi's HAT that is connected to the spring pins of PurePi II?

Iancanada says 1,3 - 5V
ProtoDAC manual says that 2,4 - 5V

I am glad that you are enjoying ProtoDAC and Moode.

"Iancanada says 1,3 - 5V" To add to the confusing Ian Canada manual. There are five spring loaded GPIO contacts numbered 1, 3, 5, 10, 13. These connect to RPi GPIO pins 2, 4, 6, 9, 14 , respectively. 

I have used the PurePi with ProtoDAC. The RPi is designed to be mounted on the PurePi. The pins connect the 5V ultracap supply and ground to the RPi GPIO pins from the bottom. Yes, you can stack the Innomaker/ProtoDAC directly on the RPi. There is no need to use a stacking header in this case. 5VDC with pass through the GPIO to the Innomaker master DAC (reclocker in your case) and ProtoDAC.

The 3V LiFePO4 battery supply is unused in your setup.

The following does not pertain to your setup. Just for additional information.

The 3.3V LiFePO4 battery supply is designed to be used with the FifoPi Q7. The batteries power Q7 via the 3.3V terminal with a jumper wire. The isolated GPIO of Q7 has a nonstandard GPIO with only 3.3V on pins 2 and 4. This cannot be changed with Q7. In that case, there are two options with powering ProtoDAC mounted on the Q7:

1) Option 1: A stacking header with GPIO pins 2 and 4 removed is used. Power ProtoDAC using the GND/5V pads located between the RCA jacks. This is a reversible method, since ProtoDAC could be powered from the GPIO in another setup.

2) Option 2: Remove pins 2 and 4 from the ProtoDAC GPIO before soldering. In that case, ProtoDAC must always be powered from the GND/5V pads between the RCA jacks.