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Mike Lyons  
#1 Posted : Sunday, February 14, 2021 6:59:58 AM(UTC)
Mike Lyons

Rank: Member

Groups: Member
Joined: 7/22/2010(UTC)
Posts: 20
Thailand
Location: Bangkok

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 1 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)  | Reason: Not specified

Mike Lyons  
#2 Posted : Wednesday, February 24, 2021 1:23:32 AM(UTC)
Mike Lyons

Rank: Member

Groups: Member
Joined: 7/22/2010(UTC)
Posts: 20
Thailand
Location: Bangkok

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)  | Reason: Not specified

Mike Lyons  
#3 Posted : Wednesday, February 24, 2021 2:09:20 AM(UTC)
Mike Lyons

Rank: Member

Groups: Member
Joined: 7/22/2010(UTC)
Posts: 20
Thailand
Location: Bangkok

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.
Mike Lyons  
#4 Posted : Thursday, February 25, 2021 3:23:04 AM(UTC)
Mike Lyons

Rank: Member

Groups: Member
Joined: 7/22/2010(UTC)
Posts: 20
Thailand
Location: Bangkok

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.
Mike Lyons  
#5 Posted : Thursday, February 25, 2021 4:06:50 AM(UTC)
Mike Lyons

Rank: Member

Groups: Member
Joined: 7/22/2010(UTC)
Posts: 20
Thailand
Location: Bangkok

Swapped a ventus for a ballsie. No on/off noises but no music either....
Mike Lyons  
#6 Posted : Friday, February 26, 2021 6:29:26 AM(UTC)
Mike Lyons

Rank: Member

Groups: Member
Joined: 7/22/2010(UTC)
Posts: 20
Thailand
Location: Bangkok

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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