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Hi all, recently finished my BIII, but I have a few problems: 1. Lock with SPDIF signals is intermittant 2. Signal from WaveIO USB/I2S board seems not to be recognised by BIII. Hence no music. By connecting the GND terminal of the toslink module to chassis I managed a stable lock with SPDIF signal. Music seems to be ok. It seems to me connecting GND on Toslink module to chassis is a rather crude way to fix the problem. Can someone show me a good gronding scheme for the DAC? Where to make a common GND? Where to connect GND to chassis? For the moment I have no connection to chassis and no common GND point. All is floating. For the second problem I have no idea what to do. I checked voltages on I2S input terminal of sidecar with my oscilloscope and found following signals when streaming: BCLK: Square wave around 10MHZ LRCLK: Square wave around 200kHz Data: Square wave signal my oscillo can't see clearly, The sidecar is being switched to I2S by 4th position of the source selector. Relais are activated normally. Does someone have an idea what could be the problem? Kind regards, Henri Edited by user Sunday, April 1, 2012 1:30:59 PM(UTC)
| Reason: Not specified henri47 attached the following image(s):  insideBII.jpg (193kb) downloaded 402 time(s). buffIII.jpg (114kb) downloaded 362 time(s).You cannot view/download attachments. Try to login or register.
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Hi Henry OK just a guess I'm using the same WAVEIO board from Lucien but it's driving my DIY 9023 DAC until my Buffalo 3 arrives. I do remember Lucien saying that I needed to be careful with grounding at the time. It looks like you are using the standoffs supplied with the WAVEIO board in which case the board ground is connected to the chassis ground (H2)and also connected to the ground input of the sidecar. So it’s not floating For my DAC I used isolated spacers instead of the ones supplied to keep the board ground floating which works well in my implementation. I’m not sure if keeping all grounds floating makes a difference but no harm in trying. So you could try and see if that helps any. Just a wild guess but it may solve your problem. Your work is of some interest to me as I will be following in your footsteps but I’ve gone for the Teleporter approach. Superb build by the way Take care Edited by user Monday, April 2, 2012 5:09:40 AM(UTC)
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Thank you for the kind words. I do use the standoffs Lucian supplied with the WaveIO board, but they are carefully isolated from chassis ground. The ground plane (H4) is connected with GND on the sidecar. So I think all is floating.
I must update my original post because the unstable lock on SPDIF is back. It seems that my so called solution is no cure at all. The DAC loses lock randomly and sometimes keeps locked for minutes, but then loses sync every few seconds.
BTW: will you use the teleporter to transport USB signals to the WaveIO board?
Thanks for your reaction,
kind regards,
Henri
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Hi Henry Sorry I could not be more helpful with your problem but I’m sure help is on its way to you soon. I’m planning to use the Teleporter in the following way PC (JPLAY MP3toys)-USB (short cable) WAVEIO I2S-Teleporter sender-LVDS-Teleporter receiver I2S-DAC. From what I’ve read on the DIYAUDIO thread the WAVEIO is a little sensitive to the length of USB cable used, so to avoid having my PC crammed in with my HIFI I can use the Teleporter to do the hard work of transmitting LVDS (converted from I2S) to the DAC and then the Teleporter receiver converts back to I2S to fed the DAC. Seems like a great idea to me My PC is 6 meters from my audio system so the Teleporter should help quite a bit. I’m only intending to use USB-I2S so I’ve no need to worry on other inputs and switching The WAVEIO is a nice board and I’m pretty sure that once you have it feeding your Buffalo that you will be pleased with the overall sound quality. Best of luck Take care Edited by user Monday, April 2, 2012 10:27:40 AM(UTC)
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Seems a nice setup to me. In your case the teleporter is the ideal solution to transport the signal over a long distance.
Succes building the BIII.
kind regards,Henri
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Hi all, About the problem of I2S not recognised by BIII, I suspect the relais of sidecar not doing their job. When playing music I have signal on BCLK, LRCLK and DATA of the input connector of the sidecar. Setting source selector in position 4 (USB/I2S) the relais are activated. I can hear them click, but I do'nt know if all of them are working ok. Checked ribboncable many times. All ok. Measuring with the scope after the sidecar (Digital input connector of DAC) I see NO BCKK, heavily distorted LRCLK and NO DATA. In the attachements you can see what I mean. Could it be a faulty Relais, switching the BCLK ? Why are the signals distorted? Thanks for responding, Henri Edited by user Monday, April 2, 2012 2:34:27 PM(UTC)
| Reason: Not specified henri47 attached the following image(s): P1050429.JPG (119kb) downloaded 282 time(s). P1050430.JPG (116kb) downloaded 283 time(s). P1050431.JPG (122kb) downloaded 283 time(s). P1050432.jpg (140kb) downloaded 281 time(s).You cannot view/download attachments. Try to login or register.
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Do they seem to work using a simply continuity test?
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Hi Brian,
Took the sidecar apart and powered it with an external power supply. I only tested if they are properly activated. Voltage on B-terminal was 1,2V with 1K resistor. To activate Base of transistor and use it as a switch 2mA is required. The resistor had to be replaced by one of 600 Ohm. I will again take it apart and do a continuity test.
Thanks Brian
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Ok Brian, Strange... Continuity test seems to be ok. Then it should be that ribboncable, but I checked it already ten times. Plugged in Ribon cable to DAC and checked continuity  . All ok. It is strange SPDIF works normally (except the locking issue). ??? Edited by user Monday, April 2, 2012 3:43:20 PM(UTC)
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check continuity at the DAC itself.
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little question first:underneath the DAC board are jumpers for stereo PCM (JPCM1....3). I did NOT place these jumpers according to the Integration Guide.
I take that is ok?
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nice build!
the guide says not to use the pcm jumpers, so I didn´t either
have selector switch /relay related problems too
best
Leif
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Hi leif,
Thanks for the nice words, but it is as important the DAC works.
I've followed your posts and I see you also got your portion of gremlins.
I do not have the needed knowledge in the digital field. I'm an old fashion analog man. This is my first digitally inclined project.
I hope we can figure it out with the valued help of the members of this forum and especially Russ and Brian.
Kind regards
Henri
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I checked all connections up to the dac-board. All ok. Then I placed sidecar back in circuit and took the dac out. Powered sidecar an connected I2S signal. Now I could see the I2S signals on the ribbon cable connector normally sitting on Digital input connector. All seems to be ok. Honestly said, I did expect to see that. How else explain the fact SPDIF signals are perfectly handled by the DAC( except the lock problem). Indeed they arrive at the same terminals D1,D2,D3 etc. If I understand it well, it is the DAC who chooses between SPDIF,PCM or DSD. Can someone tell me how a I2S data signal should look like? It is also a possibility that signal is corrupted. Many thanks Edited by user Tuesday, April 3, 2012 4:22:18 AM(UTC)
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When using sidecar you do not want to use the PCM jumpers.
Do you have GND coming from the I2S source to the sidecar?
Can you get a close up of the connection between the sidecar and the source?
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Yes, the ground plane of WaveIO USB/I2S board is connected with GND of Side car. (Orange wire on picture.) BTW, I checked the input selector to see if the 2-bit signal for the DAC is correct. It was. henri47 attached the following image(s): P1050437.JPG (170kb) downloaded 244 time(s). P1050438.JPG (180kb) downloaded 235 time(s).You cannot view/download attachments. Try to login or register.
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So are all three signals making it all the way to the DAC?
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yes. In my opinion the only problem could be a fault in the dacboard or a corrupted I2S data signal. It also puzzles me the signals are so deformed when I made connection with the digital In connector on Dac board Edited by user Tuesday, April 3, 2012 7:16:28 AM(UTC)
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Any possibility you have another source to test with?
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Sorry, only SPDIF. With These signals the Dac is in working order exept for the lock issue.
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