Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board - Page 37 - diyAudio
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Old 12th April 2013, 09:10 AM   #361
vzs is online now vzs  Europe
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Last ideas:

- some capacitors seems to be missing around PCM1704 (C39, C41,...) - these seems to be +- decoupling of digital supplies. Are these soldered on bottom-side of the PCB, if not - why do you removed them? To keep your wires on top - try to solder these caps on the bottom-side (watch for polarities)
- is DF1704 powered? without input it's outputs are probably low - being connected to the DACs these might interfere with the other signals. If it's easy (e.g. unsoldering a ferrite-bead) try to un-power DF1704
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Old 12th April 2013, 10:37 AM   #362
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Quote:
Originally Posted by vzs View Post
Last ideas:

- some capacitors seems to be missing around PCM1704 (C39, C41,...) - these seems to be +- decoupling of digital supplies. Are these soldered on bottom-side of the PCB, if not - why do you removed them? To keep your wires on top - try to solder these caps on the bottom-side (watch for polarities)

The +- psu goes directly to PCM1704 so C39, 41 etc aren't necessary

- is DF1704 powered? without input it's outputs are probably low - being connected to the DACs these might interfere with the other signals. If it's easy (e.g. unsoldering a ferrite-bead) try to un-power DF1704

Nothing more of the obard is powered only the PCM1704

Last edited by merlin el mago; 12th April 2013 at 10:48 AM.
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Old 12th April 2013, 10:54 AM   #363
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Must read articles about bypass caps roles: "Successful PCB grounding with mixed-signal chips": part 2
Also read part1 and part3.

Even if it goes directly from PSU they should be there, so as a last try, you could try to put them back (to the bottom to leave your wires on top) at least for one DAC.

edit: link corrected

Last edited by vzs; 12th April 2013 at 11:16 AM.
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Old 12th April 2013, 11:08 AM   #364
regal is offline regal  United States
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Quote:
Originally Posted by vzs View Post
Must read articles about bypass caps roles: "Successful PCB grounding with mixed-signal chips": part 2
Also read part1 and part3.

Even if it goes directly from PSU they should be there, so as a last try, you could try to solder them back at least for one DAC.

edit: link corrected
agree, local decoupling isn't a nice too have its a necessity.
With the PCM1704 you will also fid that high vales for the servo decoupling benefit in disabling the stupid BPO, but you need to get 192khz working first correct?

What speed is your master clock ?

Last edited by regal; 12th April 2013 at 11:31 AM.
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Old 12th April 2013, 11:16 AM   #365
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Just in case I have put C39, 41.. and same noise mixed with music.
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Old 12th April 2013, 11:24 AM   #366
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Quote:
Originally Posted by regal View Post
agre, local decoupling isn't a nice too have its a necessity.
With the PCM1704 you will also fid that high vales for the servo decoupling benefit in disabling the stupid BPO, but you need to get 192khz working first correct?

Yes I need to get 192KHz working


What speed is your master clock ?

WaveIO clocks 22,XXX & 24,XXX
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Old 12th April 2013, 11:45 AM   #367
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And you are sure your wave I/O setup works at 192khz ?
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Old 12th April 2013, 12:03 PM   #368
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Yes with BII & BIII using non isolated outputs.
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Old 12th April 2013, 01:18 PM   #369
regal is offline regal  United States
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Originally Posted by merlin el mago View Post
Yes with BII & BIII using non isolated outputs.
But the BII and BIII have a PLL, my guess is that the 192khz doesn't work on the BIII with the PLL at the lowest setting?
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Old 12th April 2013, 01:33 PM   #370
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Quote:
Originally Posted by regal View Post
But the BII and BIII have a PLL, my guess is that the 192khz doesn't work on the BIII with the PLL at the lowest setting?
I don't know, now I'm using Amanero with BIII, probably the problem is something that has to see with the clocks or the "timing"" of the BCK?
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