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RE: Help please with low level noise problem with DAC 3.1

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In Reply to: RE: Help please with low level noise problem with DAC 3.1 posted by horny on September 19, 2010 at 01:24:25

I have the upgraded PS version.

In my L3 I'm using two (one for each channel) decoupling chokes and two 150uf VK BG caps (one for each channel) in my L3 which I like the most after significant experimenting with different caps, different values, no caps/no choke, etc. obviously personal preference and system synergy comes into play here . . .

However, in my DAC 3.1 I'm currently using:

The following are Panasonic TS-ED 450v caps (again arrived at by recommendations and experimentation)

C5 82uf
C3 220uf
C6 220uf
C7 220uf

The following are consistent with the stock uf and voltage values but using different caps. (BG and Audio Note) except for C10 is stock

C1, C8, C9, C10, C2, & C4

The issue is everything was working well until it wasn't . . .:-)

I currently have the decoupling choke in place with no cap as I haven't "decided" whether or not to continue to experiment with different caps or remove the decoupling choke/cap combo in my DAC all together. I realize there is varied opinion on this . . . as there is on everything in life . . .:-)

So back to my original problem . . . a low level "garbled sound" heard from the speakers only when the DAC is in the system and a CD is playing. . . otherwise the "garbled sound" is not present . . .??? When the volume is turned up it masks the garbled sound but it is still present . . .

m-

Follow Ups:

RE: Help please with low level noise problem with DAC 3.1 - Bohun 11:07:00 09/20/10 (1)
Hi AudioNorth,
I have experienced similar problems (noise from DAC) only if the grounding screw on digital PCB was not securely in place.

Another source of noise was created by I/V transformers. How did you connect them? Have you tried Brian's new grounding scheme?

Bohun
- RE: Help please with low level noise problem with DAC 3.1 - Audionorth 20:52:38 09/20/10 (0)
  The I/V transformers are connected basically stock with neoprene washers under the standoffs to minimize vibration.
  
  I have the new grounding scheme implemented in my L3 but since my DAC "was" quiet and working perfectly I decided not to mess with it . . .well until now that is . . .:-)
  
  I will also recheck the digital PCB grounding connection.
  
  regards,
  
  m-
RE: Help please with low level noise problem with DAC 3.1 - horny 22:34:16 09/19/10 (0)
hello M
I tryed this supply also and i think the problem is there
everything is stressed because of the high capacitance.
and i dont like the sound at all ,i cant imagine that someone like it to. Or there was from the start no reverence at all.

The original new supply fine but has allready much higher capacitance than the Audio Note original
the advantage of a regulated supply is that you can use less capcitance for better sound
Build it back with the stock values and use directly after the rectifier 20 to 30 uf.
Remove the decoupling choke and cap the newer supply dont need it.
Then you hear also how good it sounds.

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