do you want to rebuild the copperplate or just make a nice sounding dac in a box?
We did not produce a kit or description so far, but it all starts with bending away (or cutting) all power supplying und ground pins of the 40 pin connector of the pi. (bending away makes a gap of about 1mm which is not a problem, you just have to do the spacing between pi and dac right)
And then at least support the pi +5v, the dac digital +3v3 and the dac analog +5v with a “better power supply” and please leave the switching handy charger power supply away. Don’t forget that the pi and the dac will also need ground, and the leads should meet at one point (star ground).
“Better power supply” is the key to better sound and it starts with a good transformer, rectifier, crc cap array and power regulators using lm317 or even a superteddyreg for the analog side of the dac.
Look at the circuit of the “acoustica 5v LED” lm317 reg on our site for a simple and good reg:
sites.google.com/a/architekturk … regulators
We sometimes leave a lot of stuff away, such as the diodes on the original Texas Instruments proposal for the lm317 or the in or out caps, but we can not guarantee for proper and safe function in different than our setups. We have lots of links to people who have something to say about these things on our site.
All in all these improvements of the pi-dac combo are not really complicated, and if you are really keen to build something we’ll support you.
Have a nice day and sorry for answering late - haven’t been here for a while…