What's the recommended curcuit when applying BC550/BC560 mod? I'm wondering if on rev. 2 board I should change some resistors values for this mod. Most people applied this mod on rev. 1 boards with resistor changes in vref circuit. Are the values from rev. 2 optimal for BC550?
Also the first version of this mod was with one of resistors shorted, then there was an suggestion not to short it. How this applies to rev. 2 board?
Also the first version of this mod was with one of resistors shorted, then there was an suggestion not to short it. How this applies to rev. 2 board?
Firmware version 1.03 is now up on http://www.soekris.dk/download.html
There are now full DSD support, up to DoP128 and DSD256, depending on the used USB to I2S interface.
Pinout for DSD is per de facto standard:
I2S bclk -> DSD Bit Clock
I2S lrclk -> DSD Left Data
I2S dat -> DSD Right Data
It was a little tricky to get rid of small clicks when switching between PCM and DSD and to ensure correct and quick PCM and DSD detect, should be pretty good now, but please let me know what you think....
Other changes to this version is a fix for the multiple IIR filters issue and new status output L000 when no link.
One question: As part of PCM/DSD detection and mute I use the continuous switching of the DSD data lines to detect DSD signal. I tried finding info for worst case time of no switching when DSD data is present, but haven't been able to locate any info. But to me it looks like pretty constant switching without longer periods of no switching, thanks to the fifth order noise shaping.... But if anybody have facts I would be very interested....
There are now full DSD support, up to DoP128 and DSD256, depending on the used USB to I2S interface.
Pinout for DSD is per de facto standard:
I2S bclk -> DSD Bit Clock
I2S lrclk -> DSD Left Data
I2S dat -> DSD Right Data
It was a little tricky to get rid of small clicks when switching between PCM and DSD and to ensure correct and quick PCM and DSD detect, should be pretty good now, but please let me know what you think....
Other changes to this version is a fix for the multiple IIR filters issue and new status output L000 when no link.
One question: As part of PCM/DSD detection and mute I use the continuous switching of the DSD data lines to detect DSD signal. I tried finding info for worst case time of no switching when DSD data is present, but haven't been able to locate any info. But to me it looks like pretty constant switching without longer periods of no switching, thanks to the fifth order noise shaping.... But if anybody have facts I would be very interested....
Hi Søren,
thanks a lot for your engagement, hard work and nice results 🙂
I just flashed the firmware with no problems.
There is one issue (Mac OS X; Audirvana Plus, Amanero USB-Card):
- when Audirvana is set to no conversion (no DoP) everthing is OK
- when using DoP 1.0 or 1.1 the both channels (right and left) are reversed
Is there a need to change the settings of the Amanero USB-Card with the flash utility
Thanks for a short answer
Greetings Arnd
thanks a lot for your engagement, hard work and nice results 🙂
I just flashed the firmware with no problems.
There is one issue (Mac OS X; Audirvana Plus, Amanero USB-Card):
- when Audirvana is set to no conversion (no DoP) everthing is OK
- when using DoP 1.0 or 1.1 the both channels (right and left) are reversed
Is there a need to change the settings of the Amanero USB-Card with the flash utility
Thanks for a short answer
Greetings Arnd
hallelujah, finally we have long waited DSD support! thanks' Sören, as now I can compare my BIII with DAM (or just enjoy playing my library of DSD rips).
cheers
Danny
cheers
Danny
Thanks to Søren for his excellent work.
I had an issue with reversed channels when using DoP 1.0/1.1 (Mac Os X, Audirvana, Amanero USB)
I fixed it with the Amanero flash tool (swapping channels for DSD)
Did anyone got the same issue?
Greetings Arnd
I had an issue with reversed channels when using DoP 1.0/1.1 (Mac Os X, Audirvana, Amanero USB)
I fixed it with the Amanero flash tool (swapping channels for DSD)
Did anyone got the same issue?
Greetings Arnd
Could have switched the channels, my fpga code is actually not that clear about that, let me check....
I fixed it by swapping the channels for DSD with the Amanero tool.
But could be interesting for the other users 🙂
But could be interesting for the other users 🙂
I'm pretty sure I switched the DSD channels, murphy at work. The files on the website have been updated, be sure to use the newest dated one.
Hello Søren,
I flashed new firmware version and set DSD channel mapping
for the Amanero card to normal value.
Everything is OK now.
Greetings Arnd
I flashed new firmware version and set DSD channel mapping
for the Amanero card to normal value.
Everything is OK now.
Greetings Arnd
If you want to use DSD then you need new filters. Otherwise 0.99 filters should work just fine.
Ehh,is the new firmaware only for DSD files?
Cause I get no sound playing AIFF files,going back to 0,99 gets me sound....
Cause I get no sound playing AIFF files,going back to 0,99 gets me sound....
AIFF files has nothing to do with the hardware...
But are you sure you downloaded the 1021full_103.skr, and remembered to do the "update" command ?
Yes 1021full_103.skr and update,and it says that I have rev 1.03 on the screen but no sound.
And theres no sound on DSD files either.
And theres no sound on DSD files either.
Last edited:
Soren,
a needed information for the filter diy fraction 😉
What is the possible maximum number of coefficients for the DSD FIR1 filters?
a needed information for the filter diy fraction 😉
What is the possible maximum number of coefficients for the DSD FIR1 filters?
+1
No sound after upgrade to 1.03, had to rollback to 0.99. mine is v2 stock board.
What could be the issue, none of the inputs working, DAC locks onto optical/spdif/i2s inputs (tested all 3 separately) but no sound