It doesn’t take a long time to disassembly this tiny cute ASUS Xonar U1. So I decide to do it on my short spare time.
The first thing to do when disassembly the ASUS Xonar U1 is to remove the big volume control button as shown below.
Then prepare to see amazing thing inside.
It’s a small USB sound card. As you can see from the photo below. The input is USB, then filtered directly into two big 1500uF 6.3 Volt main capacitors. The main “brain” is suspected as CMedia Nitrogen D2.
After that, remove the glued rubber from the bottom.
Remove two screws from the bottom side. Then you can see the bottom side of the ASUS Xonar U1 main PCB.
Remove another screw and you can release the PCB from the chassis.
The bottom side picture of the PCB. Almost all of them are SMDs components. Not many stuffs to be modded here.
The top side of the PCB. The main line output also can provide enough amplification for your headphone and also acts as SPDIF output. There are also some capacitors. From my short time analysis, these capacitors most likely used for signal coupling. The size is quite small, around 2.2 uF.
The ASUS labeled UA100 is most likely the CMedia Nitrogen D2. You can see also a 12.000 MHz clock. The same standard used in the CMedia chipset.
The bad side so far? ASUS only implements 48 kHz internal sampling rate and no option for 44.1 kHz. I think the CMedia Nitrogen D2 is able to do 44.1 kHz. So this should be driver related problem only (I hope so!).