Thank you Soren,
that is exactly the answer I wanted.
Do I need to have a look at something else, maybe the power supply caps (cause they are bigger in Rev3)? Or doesn't that make any difference and the only thing that needs to be done is the new arrangement of the Vref-buffer?
The muting will be done with the muting board from Normundss.
Johannes
Danes are famous for their design but Sören, the silkscreen on the front needs som work. Must be some retired B&O folks that would like som therapy activity?
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+1 Couldn't agree more, I like the simple silkscreen and absolutely hate it when designers feel the need to put logos, text and all sorts of other nonsense on a PCB.
My bad, I read 'silkscreen' and figured he meant the PCB, but I see the USB DAC has silkscreen printing as well.
I wouldn't worry about it, your DAC needs to be evaluated by merit of its performance, not how lush the packaging, or how fancy the printing on the case is.
i see you've eventually switched to fixed frequency clocks
are they 22/24 or 44/48
is the firmware different or applicable to the diy boards
it is something that might be worth trying
And then the short jitter buffer strategy from the original boards can't be applied anymore... how is it solved and how does it impact performance?
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The dac1101 is USB only input, with asynchronous clocking, so there is no need for a programmable clock, that why two cheaper oscillators are used, still low jitter ones.
The dac1101 is a little different than the dam1021, so off course it have it's own (derived) firmware.
Would an XMOS chip even work with a programmable clock on its own? Every reference USB to I2S converter always calls for its own pair. Understandable you would just use those clocks for everything else too.