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Old 30th August 2017, 01:05 PM   #11
pmchoong is offline pmchoong  Malaysia
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Hi

I have now lost the right channel. I am using only one IVY board now.
My measurement with the CD transport connected and playing:

Placid HD for B-III
Start = 5.36V
After half hour = 5.22V
Shunt : 68.1mV

Placid HD-BP for IVY
Left Channel : 14.90V
Shunt : 62.7mV
Right Channel : 14.97V
Shunt : 66.9mV

The dropouts still occurs, now at 30 or 40 seconds each time. The distortion is gone but the 1st second of the signal is still missing. This 1st second missing signal only happened with the media player. It is perfectly okay with the CD transport.
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Old 30th August 2017, 01:46 PM   #12
Russ White is offline Russ White  United States
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Just the BP currents should need to be be adjusted - watch the shunt current - my guess is you are going to need an additional 150ma or so. Still, you should check both supplies. What firmware are you using?
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Last edited by Russ White; 30th August 2017 at 01:48 PM.
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Old 31st August 2017, 05:22 PM   #13
pmchoong is offline pmchoong  Malaysia
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Now, I have adjusted the shunt current while with the cd transport connected and playing for 20 minutes but still the dropouts occurs, sometimes frequent, sometimes not so :

Placid HD-BP
Left :
Shunt : 189.5mv
CSS : 346.5mV
Output : 14.83V

Right :
Shunt : 189.1mV
CSS : 344.1mV
Output : 14.73V

I don't know which firmware I am using.
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Old 31st August 2017, 11:24 PM   #14
Russ White is offline Russ White  United States
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Do you have a picture of of the setup - especially around the sidecar and DAC digital signals.
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Last edited by Russ White; 31st August 2017 at 11:39 PM.
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Old 1st September 2017, 06:44 PM   #15
pmchoong is offline pmchoong  Malaysia
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Please see the pictures. The right channel has no sound.

Ignored the bottom IVY, it is not connected to the B-III.
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File Type: jpg 20170901_140838.jpg (617.1 KB, 24 views)
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Last edited by pmchoong; 1st September 2017 at 07:04 PM.
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Old 1st September 2017, 07:01 PM   #16
pmchoong is offline pmchoong  Malaysia
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More pictures.
Another question : How does the 'mute' operate? It seems that when no signal is lock on, the mute Led lights up but as soon as a signal is detected, the 'mute' led is off even if you selected another none signal input.

Thanks again.
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Old 1st September 2017, 07:14 PM   #17
pmchoong is offline pmchoong  Malaysia
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Another view of the boards.
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Last edited by pmchoong; 1st September 2017 at 07:18 PM.
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Old 1st September 2017, 07:30 PM   #18
pmchoong is offline pmchoong  Malaysia
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More pics
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Old 1st September 2017, 07:41 PM   #19
Russ White is offline Russ White  United States
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Hmm - it might be time to rule out a problem with the IVY-III...

I would test it by removing it from the rest of the circuit and connecting the inputs to GND. Then power it up with +/- 15V as usual and check all of the outputs. They should be very close to 0V. Also check that none of the ICs are getting overly hot. They will be warm - but should not be hot. If one of the OPA1632 is really hot it will need to be replaced (it likely has an internal short from some damage).

You could also swap out the IVY-III and test the one you have not used yet.
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Old 1st September 2017, 07:42 PM   #20
Russ White is offline Russ White  United States
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Also it appears you have an unused secondary for your 5V supply. I would carefully (observing polarity/phase) parallel the two secondaries to increase the current available to your placid.
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