Hi Ray,
following:
- first option is BBB + Pavel´s BBB isolated reclocker redsign (only SMD components and only on top side)
- second option is COMBO 384 + Pavel´s DSD2.6 isolated reclocker (not yet designed)
Yes, header are SMD allowing carrier board male header to go through so Marcel´s frontend could be stacked
JP
following:
- first option is BBB + Pavel´s BBB isolated reclocker redsign (only SMD components and only on top side)
- second option is COMBO 384 + Pavel´s DSD2.6 isolated reclocker (not yet designed)
Yes, header are SMD allowing carrier board male header to go through so Marcel´s frontend could be stacked
JP
Last edited:
I still had to post the expected timing for the data and clock input section. Referring to the attached picture, this is what I calculated (with the SN74LVC2G86 connected, so without the clock division):
From A to B and Bi: 3.4 ns to 8.6 ns of delay, B in phase with A and Bi in antiphase
From A to D: data clocked in at the rising edge, delay between 1 ns and 9 ns
E and E': data transitions between 22.1 ns and 31.6 ns after the rising edge of Bi
C and C': rising clock edges between 1 ns and 4.1 ns after B and Bi, respectively, at minimum potmeter setting, between 10 ns and 17.3 ns after B and Bi, respectively, at maximum potmeter setting
From A to B and Bi: 3.4 ns to 8.6 ns of delay, B in phase with A and Bi in antiphase
From A to D: data clocked in at the rising edge, delay between 1 ns and 9 ns
E and E': data transitions between 22.1 ns and 31.6 ns after the rising edge of Bi
C and C': rising clock edges between 1 ns and 4.1 ns after B and Bi, respectively, at minimum potmeter setting, between 10 ns and 17.3 ns after B and Bi, respectively, at maximum potmeter setting
Attachments
I've just paid the customs fee on the PCBs from PCBway (for the Marcel design DSD-only Valve DAC) so hopefully Mr. DHL will deliver them tomorrow.
You clearly know your stuff Marcel so I'm confident they'll work providing I can solder the smd parts without mistakes!
I'll send one of the boards to you in the next day or three...
Just wondering out loud...
Could a Silk TVC be used as the transformer element of the reconstruction filter?
SAC Thailand
TVC Transformer Volume Control Pair (Supermalloy) – DIY Hifi Supply
Could a Silk TVC be used as the transformer element of the reconstruction filter?
SAC Thailand
TVC Transformer Volume Control Pair (Supermalloy) – DIY Hifi Supply
I can't think of any reason why not. The termination resistors would have to be on the primary side, like in the Lundahl schematic.
Yes Marcel, that's the schematic I was looking at. I think R2 can be omitted too?
R2 can be omitted when you connect the midpoint between R1 and R4 to ground (and the same holds with the Lundahl and the Chinese transformer).
Thanks. That's what I figured.
I'm hoping JP's reconstruction filter PCB design will become available to order some boards. If I go in that direction, the Silk TVCs will be easy to connect to the boards via their flying leads so no changes to the board layouts would be required.
Another step forward as it looks as though I have a functioning input to feed SDM data to the Valve DAC board.
https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-153.html#post5894378
https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-153.html#post5894378
A small step forward
A good productive day. Not only did I all but complete my Signalyst DSC2 build and to get music out of it;
https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-154.html#post5896827
but I also built-up a Neurochrome Maida regulator for the 300V supply for the Valve DAC build and I started to assemble a Salas Reflektor-D to use for powering the 5V sections of it.
Ray
A good productive day. Not only did I all but complete my Signalyst DSC2 build and to get music out of it;
https://www.diyaudio.com/forums/digital-line-level/254935-signalyst-dsc1-154.html#post5896827
but I also built-up a Neurochrome Maida regulator for the 300V supply for the Valve DAC build and I started to assemble a Salas Reflektor-D to use for powering the 5V sections of it.
Ray
Hello,
very busy last days but here the progress: reconstruction filter at outputs missing (and regulator tube with pico7 socket).
Carrier board allowing BBB and COMBO 384 variants: both dedicated reclocker redesigned.
Power supply on own board.
I´m on travel next week so no progress expected.
JP
very busy last days but here the progress: reconstruction filter at outputs missing (and regulator tube with pico7 socket).
Carrier board allowing BBB and COMBO 384 variants: both dedicated reclocker redesigned.
Power supply on own board.
I´m on travel next week so no progress expected.
JP
Attachments
Very nice JP.
What's the size of the carrier board? I assume it is simple two layer?
I assume the filter boards will be located underneath the carrier board?
Ray
What's the size of the carrier board? I assume it is simple two layer?
I assume the filter boards will be located underneath the carrier board?
Ray
I noticed the JG Buffer board on the JL Sounds website and I'm thinking it might be a good cheap/easy way of checking the Valve DAC works OK and to perhaps experiment with different reconstruction filter options. It uses small Fastron PCB inductors, which I know Mouser carries a good selection of.
JG buffer - I2S over USB Audio
JG buffer - I2S over USB Audio