R2R DAC trimpot

Not much activity on this thread I can see, Installed one of these R2R DACs today, coupled with Linear PSU and I2S direct from Raspberry PI 4.
After 4-5 hours playing, it is actually comparable with Denafrips Pontus 2, only diff is as thread starter mentions Pontus 2 is cleaner, probably because of all that power filtering. In the future I will add more capacitance to the PSU and see if that makes a different. Else it is a bargain. Make your own and pay 10 times less.
Playing with DIY Integrated using 6sN7 Pre, Purifi Eval1 power amp, Audio Physics Virgo 5.
Ordered from audiophonics france with suggested transformer and psu board on the same site.

No regrets going from Ares 2 to this DAC.

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Sorry I really doubt if THESE R2R-DACs can operate in a suitable way. It is a known fact that the benefit of an R2R stands and falls with a precise calibration and according to the R' values which always differ statically and dynamically in temperature are permanent real time correction has to be applied. This typically is done in the FPGA itself, using the built in Block-RAMs. Unfortunately the MAX2 used in there does not have much RAM to do that and I hardly can imagine, how this might be done from outside in the DAW or the Player.
 
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Discrete R2Rs can be tricky for many reasons, but mainly resistor matching and temp coefficient. The sound will be different as the unit warms up and the resistors drift. Thats why laser trimmed parts are needed to get the linearity right. I much prefer the TDA1541A S2 and PCM63K as the foundation of a great DAC. The later AKMs are also very nice in balanced mode.