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LOCK LED flashing when connect with Coaxial source
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Joined: 9/5/2012(UTC) Posts: 59  Location: Hanoi Thanks: 5 times
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Hi,
My BIII works well with Optical signal (both via TOSLINK directly or via SPDIF4), however, when I connect it to Coaxial signal (via SPDIF out of sound card Asus Xonar Essence and a Tvix HD Player), LOCK LED keep flashing very fast.
I connect Coaxial signal to SPDIF4 ver 1.1 with R = 75ohm, Rz = 0ohm. My coaxial cable is a 75ohm Canare.
Could you pls advice me what to do?
Thank you very much.
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Maybe you can try to equalize the ground potentials of the player with the DAC and S/Pdif board. Is the Player grounded? Does the DAC and everything already have a casing? Is the DAC and it's casing connected to earth? The Coax S/Pdif must be galvanically decoupled in the S/Pdif 4:1 board. But maybe you have the RCA connector connected with the casing via the outside Cinch.... Try to experiment a little bit with this. Jordo Edited by user Tuesday, October 30, 2012 1:32:57 PM(UTC)
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Make sure you have not reversed the S/PDIF signal and GND connections.
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Joined: 9/5/2012(UTC) Posts: 59 Location: Hanoi Thanks: 5 times
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Hi Brian, I wished I reversed signal but it is correct.
Hi Jodo,
Non of them are earthed. However, my SPDIF4 working fine with Optical signal.
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What kind of voltages do they supply from the wall sockets in Hanoi?
People within 220V countries might want to lower their voltages to 4,8-4,9V for the S/Pdif board.
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Quote:People within 220V countries might want to lower their voltages to 4,8-4,9V for the S/Pdif board. Why is just in countries with 220V lines? Couldn´t it be just coincidence? You can go much lower than 4,8V if you use a separate feed for the spdif board. I use 4.0V.
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Joined: 9/5/2012(UTC) Posts: 59 Location: Hanoi Thanks: 5 times
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Hi Jordo, Cubeasic,
I am in 220V country. Problem is I supply to SPDIF4 via ribbon cable so it should be 5.2V.
However, I would try at 4.0 - 4.8V if you can share with me the pins in SPDIF4 so I can connect to (Vcc and GND).
Thank you
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You can supply Voltage via Pin 18 GND and Pin 20 VD on the DIN Connector on the S/Pdif board.
See Leon's integration Guide Page 45.
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Does anyone think that the voltage can be lowered by using a resistor in the power supply line to the S/Pdif board instead of building a dedicated power supply unit?
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Joined: 9/5/2012(UTC) Posts: 59 Location: Hanoi Thanks: 5 times
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Sorry for not response for a long time. My work not allow me to take care my BIII recently.
Jordo, I going to use lower voltage for SPDIF as your suggestion and update result. Yesterday, I found that there is some interruption also happen with my TOSLINK input to BIII via SPDIF4.
I think voltage can be lowered by resistor with no problem, just have to calculate exact value of resistor and increase shunt current accordingly on Placid HD.
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This is not ok I think. Have the same problem. This is not proffessional .
I am f...... tired of those kind off problems. Why not a supply on the spdif if the one from the dac can not be used ?
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No - it is not really supposed to be professional (though we try as hard as we can) - it is DIY. :) Which is why all of our stuff says "DIY use only".
A future revision may do that, but I am working on a better solution anyway.
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Originally Posted by: Russ White  No - it is not really supposed to be professional (though we try as hard as we can) - it is DIY. :) Which is why all of our stuff says "DIY use only".
A future revision may do that, but I am working on a better solution anyway. Thank you ! 
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Update, after I tried separated power with 4.9V, I could use my BIII with coaxial source. However, some time I heard sound is broken. It is not good as when I use with TOSLINK, I will try reducing voltage. Do you know which voltage is best for SPDIF4?
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I wouldn't go any lower than 4.75V
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Joined: 9/5/2012(UTC) Posts: 59 Location: Hanoi Thanks: 5 times
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Update:
I would lock Coaxial signal from 4.5V to 4.9V, other voltage has not been tried.
But there is one notable information is, if I plug my BIII thru isolated transformer, I can feed SPDIF4 via 20pin ribbon cable from BIII with no problem.
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Rank: Member
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Joined: 9/5/2012(UTC) Posts: 59 Location: Hanoi Thanks: 5 times
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I need to raise this issue to get support again. I found that my BIII still got problem with signal locking. Now I can only lock signal if plug both Coaxial and Optical to a source. Otherwise:
- If plug optical cable only: sometime lock LED is ON/OFF
- If plug coaxial cable only: lock LED flashing continuously.
I connect my BIII via SPDIF4.
Please support.
Thank you.
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LOCK LED flashing when connect with Coaxial source
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