Rank: Member
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Joined: 7/22/2010(UTC) Posts: 20  Location: Bangkok
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Ive been building a dual mono dac using two Buffalo-IIIsePro38's. Taking one step at a time with SPDIF input to start, after using the firmware here https://github.com/twist...rmware/compare/dual-mono I now have a lock on each channel. However, no sound. In feeding the Mercury's to Ventus EZ's. Checking I noticed that SE and GND seem to be shorted on the Mercury, both sides of both boards (power on). If I remember there was little to assemble. Just some caps and the Omron relays. I remember at the time wondering about the relays but using the marikngs on the board and a few photos I saw on line I though I had these lined up correctly. So perhaps i've fried some of the IC's? At this point I'm considering ordering another couple of Mercury's but I'd rather know what the problem is before doing that. The resistance across ROSE is 4R8 if that helps.  Mercury small.jpg (297kb) downloaded 3 time(s).Take from the omron pdf "Use the Relay as soon as possible after opening the moistureproof package. (As a guideline, use the Relay within one week at 30°C or less and 60% RH or less.) If the Relay is left for a long time after opening the moisture-proof package, the appearance may suffer and seal failure may occur after the solder mounting process. To store the Relay after opening the moisture-proof package, place it into the original package and sealed the package with adhesive tape." Here in Bangkok humidity is running at 54% today as for temperature.... Edited by user Tuesday, February 16, 2021 12:25:06 PM(UTC)
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Rank: Member
Groups: Member
Joined: 7/22/2010(UTC) Posts: 20 Location: Bangkok
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OK so I have replaced the relays....still the same. There is a popping sound at power up, silence and then at power off a sound like a needle sketching a vinyl lp, then a low murmer. I have measured the resistance between SE and GND at only around 1 ohm when powered up which is slightly higher than the 0.2 ohms I'm seeing when powered down. That just sounds wrong. On the IVY I had about 22 ohms between SE and GND. Edited by user Wednesday, February 24, 2021 1:38:05 AM(UTC)
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Rank: Member
Groups: Member
Joined: 7/22/2010(UTC) Posts: 20 Location: Bangkok
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OK so I swapped out one of the Mercury boards for an IVY...silence. As I have a lock I guess its the analog output from the BIII.
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Rank: Member
Groups: Member
Joined: 7/22/2010(UTC) Posts: 20 Location: Bangkok
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I still have a steady lock. If I unplug the spdif source I loose that. However, I noticed that if I enable the automute (switch block 2 position 1 off) then it stays on. Which kind of looks like the dac is recieving the clock but no other data.
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Rank: Member
Groups: Member
Joined: 7/22/2010(UTC) Posts: 20 Location: Bangkok
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Swapped a ventus for a ballsie. No on/off noises but no music either....
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Rank: Member
Groups: Member
Joined: 7/22/2010(UTC) Posts: 20 Location: Bangkok
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And so it turns out that the spdif out on my sound card is not working /sigh. Disassembled everything so just stereo version at the moment. Hopefully, dual mono will re-emerge in a day or two.
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