Current sit-rep. Ray has very kindly lent us the breadboard he recently completed, which has his power supplies and Beaglebone Black, together with a DSD'it PCM to DSD upsampler 'cape' that I have purchased from him, plus the RTZ DAC and filter boards that he has very kindly put together for me. I have already described the sound which I'm entirely happy with, and it works faultlessly as a Roon endpoint, so very easy to use. Plug in a network cable at one end, point Roon at it and get sound out the other. Simples!
At some point Ray will want the bits that aren't mine back, so I've started the process of designing the RTZ into a proper case. The power supplies I will be using will be:
AckoDAC 'Super Audio' PSU - 2 x 5V. This will provide independent 5V supplies to the Beaglebone and the DSD'it cape.
Salas Reflektor-D - 1 x 5V. This will supply power to the digital side of the RTZ DAC board.
AMB sigma 22 - 2 x 15V. To supply the analogue circuitry on the RTZ DAC board.
The first two (AckoDAC and Salas) were purchased from Ray some time ago, originally for a Twisted Pear DAC project that ended up on the back burner for ages whilst I faffed around with phono and line stages. The AckoDaC supply is built up and ready to go, but I do need to populate / configure the Salas supply.
The AMB board formerly saw service in my last linestage (the one with the VU meters in it) where I naively thought that replacing it with a battery powered switch-mode supply would somehow improve things. So that will be brought back into use, I just need to change a few components to convert it from ±10V to ±15V. Everything I've powered with the AMB supply has turned out sounding superb - I use it in the Millett phono and there are two of them in my new linestage, so bringing it back into service for the DAC was a no-brainer.
I did a very rough CAD layout this morning having cloned the design file for the linestage, as the dimensions will be exactly the same. This confirms there's ample space for three power transformer PCB's on the left, the three power supply boards and the RTZ board on the right hand side.
