ProtoDAC TDA1387 X8 project

[hifinet]

I have seen the technique of inverting individual bits to get polarity inversion in a few examples of diyAudio circuits. It may not give the perfect result, but it also might be "good enough" for audio. Any offset (DC) will be blocked from the output. For balanced output, one would still need to find two matched DACs, and since a transformer will give a nearly perfect result (with other advantages of a transformer), that seems to be the best solution for balanced output with ProtoDAC.