Plz help on my DIY DAC!!

[ronardi]

I received my AW-D3 kit arrived this Friday, and I have finished the soldering work already. However, poor me... when I connect it to my headphone amp, music did come out, but in low volumn with great sound distortion, like listening to a not in tune radio, while noise (hiss) was so loud. I believe it should be something wrong in the soldering process.

Despite the small sound volume and big hiss, there is another problem that the D3 has two mode by opening or shorting J2, it worked when I first finished it but when I resolder all joints on the PCB to prevent cold soldering, the J2 doesn't work since then. The light of the SPDIF kept lit and anolog output kept active. I should have short something as the two modes worked before!! plz help as I've been driven mad....could it be grounding problem? For a USB DAC, which point can be the grounding point?