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Old 8th April 2012, 01:19 PM   #1031
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All selector switch LEDs don't lit, it's OK?

Last edited by merlin el mago; 8th April 2012 at 01:39 PM.
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Old 9th April 2012, 02:52 PM   #1032
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by Russ White View Post
The auto-detect feature is especially prone to false positive on I2S data. This means when using sidecar that if you have the DAC SPDIF multiplexor set to receive either channel 2 or 4 (which map to D2 and D4 on DIN) it will *very* likely unlock the DPLL from time to time as it mistakes the PCM data for a new SPDIF signal and attempts to lock onto it in vain, only to once again soon re-lock on the I2S/DSD. This is especially true at high sample rates (192Khz and above).

The Buffalo III firmware exposes the SPDIF auto-detect register to the user using I/O B4. When B4 is high (default state - switch 2:5 open) SPDIF auto-detect is enabled. When low (same switch "on"/closed) then auto detect is disabled (or "bypassed" if you will).

If you wish to use the 2-bit selector to switch between 4 SPDIF sources (using the SPDIF4 module) and the sidecar to switch between I2S/DSD and SPDIF you should always pull I/O pin B4 low on the Buffalo 3 when you have I2S/DSD selected. The best way to do this is with dual pole single throw switch. One pole should be connected to GND and "B4" on the Buf III I/O header - the other to 5V and "B" on the Sidecar. In this way when PCM/DSD is selected SPDIF auto-detection is disabled. You also get to use all 4 SPDIF selections.

Cheers!
Russ
If I got it right it should all be connected as shown in the image, Right?

But where to get the 5V from?
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File Type: jpg Sidecare I2S or spdif.jpg (141.8 KB, 427 views)
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Old 9th April 2012, 03:23 PM   #1033
LeonvB is offline LeonvB  Netherlands
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Quote:
But where to get the 5V from?
One of your PSUs will do.
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Old 9th April 2012, 04:04 PM   #1034
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Originally Posted by LeonvB View Post
One of your PSUs will do.
You can actually get it from the VD terminal on the Sidecar, which is connected via the ribbon cable to the Buffalo's VD terminal.
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Old 9th April 2012, 04:32 PM   #1035
Corpius is offline Corpius  Netherlands
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Quote:
Originally Posted by BrianDonegan View Post
You can actually get it from the VD terminal on the Sidecar, which is connected via the ribbon cable to the Buffalo's VD terminal.
Right! Thanks!
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Old 9th April 2012, 08:29 PM   #1036
Takaji is offline Takaji  Canada
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This is currently where I am with my BIII project: http://imgur.com/TxNPb The question I have is - is there an issue with the distance of the S/PDIF Switcher Board to the BIII? If needed, I could switch places with the IVY boards and S/PDIF Switcher board. I don't know if those I2S lines can be that long... will I have unlock issues?

The acrylic back panel is only temporary and is used as a placeholder for the final panel, which will be metal.

Any other electrical design-related questions are appreciated!


Last edited by Takaji; 9th April 2012 at 08:33 PM.
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Old 9th April 2012, 11:43 PM   #1037
gwikse is offline gwikse  Norway
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Cool build. Perhaps you could shorten down the wires a bit by placing them like this.
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Old 10th April 2012, 01:15 AM   #1038
Takaji is offline Takaji  Canada
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Originally Posted by gwikse View Post
Cool build. Perhaps you could shorten down the wires a bit by placing them like this.
Great explanatory graphic! (What did you use to make it?) I can't really mount the BIII on the side, since it piggybacks on top of a USB-I2S converter, and then my custom 2-8 channel switcher is mounted on top of the BIII.

*If* the long lines are an anticipated problem, I could always swith places with the S/PDIF board and the IVY boards, and move the inputs to the same side as well. But then, the lines from the 2-8 switcher to the IVY boards will be longer, too.
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Old 10th April 2012, 02:28 AM   #1039
gwikse is offline gwikse  Norway
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Ok. In that case I would place the dac board, the sp-dif input rca/optical etc. and those other boards in that stack to the same side of the ivy`s and align the sigma11 and sigma22 to keep the wires as short and to the point as possible (I use Google Sketchup 8 to make the 3d models).
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Old 10th April 2012, 02:57 AM   #1040
Krisfr is offline Krisfr  United States
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Originally Posted by gwikse View Post
Ok. In that case I would place the dac board, the sp-dif input rca/optical etc. and those other boards in that stack to the same side of the ivy`s and align the sigma11 and sigma22 to keep the wires as short and to the point as possible (I use Google Sketchup 8 to make the 3d models).
Did you use the regular or the PRO version of Sketchup?
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