Dear all,
First off, if this is in the wrong section (digital line instead of pass labs?) forgive me.
I have a pass D1 that is configured for SPDIF input, I think it was on a version by spencer(?) back in the day. I could well be wrong on that. Anyway, things have moved on, and I have pretty much left the world of CDs behind, and was thinking of seeing could I modify this to take i2s lines directly from an xmos usb card.
Has anyone done this already? The d1 splits the lines into left and right, so I reckon I would need to inject the i2s before the flip flop that splits into left and right, but are there other considerations?
Any pointers are very welcome. I know some will say I shouldn't attempt this if I'm asking these questions, but its better to at least look at this than have such a nice piece of kit sitting on the shelf.
Fran
First off, if this is in the wrong section (digital line instead of pass labs?) forgive me.
I have a pass D1 that is configured for SPDIF input, I think it was on a version by spencer(?) back in the day. I could well be wrong on that. Anyway, things have moved on, and I have pretty much left the world of CDs behind, and was thinking of seeing could I modify this to take i2s lines directly from an xmos usb card.
Has anyone done this already? The d1 splits the lines into left and right, so I reckon I would need to inject the i2s before the flip flop that splits into left and right, but are there other considerations?
Any pointers are very welcome. I know some will say I shouldn't attempt this if I'm asking these questions, but its better to at least look at this than have such a nice piece of kit sitting on the shelf.
Fran
DIY or factory?
you mentioned Spencer as origin, but just in case
sch could help, maybe few pictures too
you mentioned Spencer as origin, but just in case
sch could help, maybe few pictures too
Thanks ZM.
Its definitely not factory for sure. I bought it years back from another member here, as a DIY model. I am probably wrong on the Spencer name.... when you look at the board, it says "diy fun - csk" and "2007 - 4 - v30" So I guess theres the dates of production. I've included a few pics. First, of the overall board, then another of the input section and lastly that name badge.
Its definitely not factory for sure. I bought it years back from another member here, as a DIY model. I am probably wrong on the Spencer name.... when you look at the board, it says "diy fun - csk" and "2007 - 4 - v30" So I guess theres the dates of production. I've included a few pics. First, of the overall board, then another of the input section and lastly that name badge.
Attachments
I have the D1 service manual, but its not my copyright, so don't want to post it without permission (although I think I might have actually got it from you!)
try to find schematic of your exact iteration, it is certainly different enough to D1, so we can't be sure to give proper advice
it can be Spencer's - chase through old threads and once you get proper schm we can proceed
it can be Spencer's - chase through old threads and once you get proper schm we can proceed
It is possible.
Not quite.
Yes.
Do you want to keep the SPDIF input ?
What usb card do have and how configurable is it ? If it only does I2S, glue logic will be required.
Do you want to playback hires files ?
I believe this is the original thread, pictures etc all line up as far as I can see.
NP D1 DAC clone with enhancement
I've attached here the PDF that is further on in that thread for my board version, I've only included the DAC section here, and all are posted starting at post 93 of that thread.
I bought this in 2009, can't believe its been that long!!
So, my coarse rusty reading of this.... in theory I should be able to bring in the i2s lines somewhere after the receiver circuitry but before where the flip flop splits the signal to left and right (I think?). So if I have MCK, LRCK, BCK, Data they should drop in somewhere there?
With humble thanks for the help so far....
NP D1 DAC clone with enhancement
I've attached here the PDF that is further on in that thread for my board version, I've only included the DAC section here, and all are posted starting at post 93 of that thread.
I bought this in 2009, can't believe its been that long!!
So, my coarse rusty reading of this.... in theory I should be able to bring in the i2s lines somewhere after the receiver circuitry but before where the flip flop splits the signal to left and right (I think?). So if I have MCK, LRCK, BCK, Data they should drop in somewhere there?
With humble thanks for the help so far....
well, I'm rusty in all things digital, so better wait that someone else chime in
long gone days when I was playing with DACs on that side and I'm pretty sure I forgot number of important details (levels, timings)
long gone days when I was playing with DACs on that side and I'm pretty sure I forgot number of important details (levels, timings)
No, I don't need to keep SPDIF - can't see me ever going back to there.
The usb card is linked below - DIYINHK Xmos one. I would consider others if that isn't suitable, but I have one to hand.
XMOS 384kHz DXD DSD256 high-quality USB to I2S/DSD/SPDIF PCB - DIYINHK
No, playing back hi res is not necessary. Sure, it might be nice to have, but not concerned if its not an option.
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I don't believe that board will work if connected directly to PCM63 as the PCM63 does not accept I2S format.
This board apparently does output the right format:
I2SoverUSB - I2S over USB Audio
This board apparently does output the right format:
I2SoverUSB - I2S over USB Audio
I could use that xmos board to output SPDIF which I could then feed in to the RCA input, but I wondered if going straight to i2s and bypassing some of the input circuitry would work..... but maybe not now as you have said.
Yes you could input SPDIF with the XMOS board.
With the JLSounds board, you would input into U11-A, -B, -C for the right channel and similar for the left channel.
http://www.jlsounds.com/uploads/I2SoverUSB v.III.pdf
With the JLSounds board, you would input into U11-A, -B, -C for the right channel and similar for the left channel.
http://www.jlsounds.com/uploads/I2SoverUSB v.III.pdf
OK, excellent. Thank you for that info. I think what I'll do is try the diyinhk board and get it working with spdif output (which should be as easy as making the connections and poaching a little 3.3V somewhere off the board.
Once that's working, I think I'll spring for that board from JLSounds and connect it in as you suggest.
Many thanks for the help on this. Is there anything else I need to watch out for do you think?
Once that's working, I think I'll spring for that board from JLSounds and connect it in as you suggest.
Many thanks for the help on this. Is there anything else I need to watch out for do you think?
Connecting directly to the PCM63 chips will change the nature of the dac as you will be bypassing the digital filter. Not sure how the output filters will deal 44k but, OTOH, you will now be hires capable.
True. Its not that I want to change the character (after all it is its own thing, and sounds gorgeous) but I would like to be able to use it with usb input.
Anyway.... just to let you know I've just done a quick and dirty connection from that diyinhk xmos board in via spdif and its working fine here. Well, it plays at least, no critical eval done yet.
Anyway.... just to let you know I've just done a quick and dirty connection from that diyinhk xmos board in via spdif and its working fine here. Well, it plays at least, no critical eval done yet.
The jlsounds i2soverusb board has been ordered. So we'll see in a few weeks how that works out.....
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Thanks Patrick - I hope you are keeping well!
Have you tried out the i2soverusb unit in that dac? How did you find it?
Have you tried out the i2soverusb unit in that dac? How did you find it?