It started when I tidied up my storage bin on last weekends, I remember that I had an unused AD1865 DAC complete board from my previous DAC project. This board is okay, I think it performed quite well at that time, but I immediately replaced it with another DAC project because my curiosity is much faster than waiting 100 hours of capacitors break-in.
So here it is, an old AD1865 DAC board with new refinement and better calculation, using all parts I have in my bin. The building cost is nothing because all the new parts are already in my hands.