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Mr White's "Opus", designing a simple balanced DAC

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L

Leeuwarden

Member
Joined 2002
So here they are! :p The switch positions.
Pictures are larger on Flickr.

First the OPUS. I'm pretty sure I got this right.


OPUS Switch by jvdwal2008, on Flickr

Second the Metronome. I'm also pretty sure I've got this right too exept for
the AUTOMUTE jumper. Am I right I need to install a jumper at that position?
DISABLE remains open.


Metronome switch by jvdwal2008, on Flickr


Third the Receiver. After taking the picture I saw I got the two middle positions wrong.
They need to be in the mid-position. (they are now in the down (-) position) Is that right?


Receiver Switch by jvdwal2008, on Flickr
 
L

Leeuwarden

Member
Joined 2002
I got the OPUS dac up and running without the Metronome and enjoyed it for a while.

The OSR switch is positioned in the middle at 96 so I thought lets put it in the high position to try 192. Did that and got no sound. So I put it back in the middle position. And... no sound. Fiddled around with the switch but still nothing...

What am I doing wrong here?
 
J

janos_904

Member
Joined 2009
UWB regulators

There was a post by Erlend Sæterdal about New Class D UWB regulators. I never heard before that brand, and decided to buy one UWB. My 5 V version arrived on Monday to replace LP2985 (DAC panel, VRA). Well, that change makes a really huge improvement. Like you put an Acoustic Zen Silver Reference IC in your chain instead of Matrix (May be bigger...). It is highly recommended tweak . János PS: I am going to replace VRD (3,3V) ASAP.
 
E

Erlend Sæterdal

Member
Joined 2007
janos_904 said:
There was a post by Erlend Sæterdal about New Class D UWB regulators. I never heard before that brand, and decided to buy one UWB. My 5 V version arrived on Monday to replace LP2985 (DAC panel, VRA). Well, that change makes a really huge improvement. Like you put an Acoustic Zen Silver Reference IC in your chain instead of Matrix (May be bigger...). It is highly recommended tweak . János PS: I am going to replace VRD (3,3V) ASAP.
Click to expand...

Happy to hear you liked it. ;)
 
J

janos_904

Member
Joined 2009
AVDD tweak

Hi, there is a must try tweak! I removed the L3 ferrite, and connected the NewClassSD (5V) regulator output directly instead of empty pad of the ferrite (to the closer side of DAC chip No15). The original VA power input is still connected, so AVDL and AVDDR still gets its power from VRA on board regulator. This tweak is very worth to do, and my opus is jumped into higher level. János
 
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