diyclub.biz DAC-38, DAC-60, DAC-68. Anybody heard?

[drlau]

DAC 38 is the best because more room to modify.

This is my Lite DAC38.

http://cid-3387ceb4500f8a8a.spaces.live.com/

 

[crt]

hallo dr.lau

i've build DAC 38 too
now around 50% to finished.
but i confused about pin (wrote 'data' on PCB) near blue relay on your DAC.
i have compared to the schematic but found only for led (2 pin) only, so 2 more pin for what ?