I built this NOS-DOC and used 8 chips in parallel. Initially, I hooked it up to a Velleman 1823 PS I had sitting around.* The sound was very sweet (which I like) but the dynamics and bass were lacking, and there was a bit of grain in the treble. Also, the 1A transformer was getting pretty hot.
As a replacement, I built one of Tangent's Tread supplies using a larger transformer as I thought that might be cutting into the dynamics. I built it out of parts I had around, so I used a 2200uF smoothing cap rather than the 1000uF in the schematic. Also, I replaced C7 with a 100uF electrolytic, and c8 with a 100uF Cerafine bypassed by a 0.22uF BC cap. Most of the sweetness is now gone from my DAC. It has deep, full punchy, though somewhat sloppy bass, and vocals are set way behind the speakers -- sounding like they are in a tunnel. I did manage to get rid of the grain, however.
So, does anyone have any tricks they would suggest to get the sweetness back while keeping some (but not all) of the bass? I assume I need to reduce the caps, but by how much? Shoud I get rid of the electrolytic (the cerafine) completely? I have some high quality 1uF Kimber Kaps I could use. I also have some 4.7uF Aeons, and 5.1 uF Solens.
-d
* while the picture does not show it, the Velleman uses a 2200uF smoothing cap, an 8uF electrolytic, a 1uF and a 0.1uF Wima parallel to the rails, and an lm317 for regulation.
As a replacement, I built one of Tangent's Tread supplies using a larger transformer as I thought that might be cutting into the dynamics. I built it out of parts I had around, so I used a 2200uF smoothing cap rather than the 1000uF in the schematic. Also, I replaced C7 with a 100uF electrolytic, and c8 with a 100uF Cerafine bypassed by a 0.22uF BC cap. Most of the sweetness is now gone from my DAC. It has deep, full punchy, though somewhat sloppy bass, and vocals are set way behind the speakers -- sounding like they are in a tunnel. I did manage to get rid of the grain, however.
So, does anyone have any tricks they would suggest to get the sweetness back while keeping some (but not all) of the bass? I assume I need to reduce the caps, but by how much? Shoud I get rid of the electrolytic (the cerafine) completely? I have some high quality 1uF Kimber Kaps I could use. I also have some 4.7uF Aeons, and 5.1 uF Solens.
-d
* while the picture does not show it, the Velleman uses a 2200uF smoothing cap, an 8uF electrolytic, a 1uF and a 0.1uF Wima parallel to the rails, and an lm317 for regulation.