gstew wrote: > John, > > I too want I2S access, but unlike JIJ3, I'd prefer pins on a connector > or at least a place where I can install connectors (u.fl?) so I don't > have to mutilate (and possibly permanently damage) the board. > > Also, John, I saw your comments on the Audio Asylum on a 3-zone DAC with > inter-zone isolation and separate power supplies. I haven't seen any > comments in these threads that this will included isolated zones, but > whether you do or not, the ability to separately power the DACs (and any > other relevant related components) separate from the card's other > processing (and the main Wandboard) might allow some potential quality > improvements. Of course, the stock configuration would have jumpers > connecting these power zones together. > > And of course, you may have great reasons for why these are just dumb > ideas. Feel free to ignore if they are. > > And many thanks to you, Jack, and everyone else making this possible!!! > > Greg in Mississippi
The board is going to be a two zone design with the processor and digital interfaces in one and the DAC chip, main clocks, reclocking flops and S/PDIF outs in the other. The two zones are separated by isolators on all signals between zones. The details of how the grounding and power supply is done and WHY I did it that way are quite complex and would take way more time than I want to spend describing in these forums. The simplified version is that there is just one 5V raw supply feeding both zones, BUT because of how the board is layed out and the isolators used on signals between zones it behaves as if it has two supplies. So you get the advantage of the isolation between zones, but only need one supply. I have tested this out on some test boards I built and it really does work. John S. ------------------------------------------------------------------------ JohnSwenson's Profile: http://forums.slimdevices.com/member.php?userid=5974 View this thread: http://forums.slimdevices.com/showthread.php?t=97881 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/discuss
