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I was curious too and did a quick search for "ladder dac", and have discovered that they're a thing in the audio woo-woo world, so this isn't just some random electronic art curio. Of course the results are, uh, mixed.Still, a great way to turn a few dollars in SMD resistors into $1,000+ of audio gear.
Hopefully nobody tells them about the thermometer coded DACs or string DACs because sooner or later we will see DACs with 2^24 resistor in them.
I was curious too and did a quick search for "ladder dac", and have discovered that they're a thing in the audio woo-woo world, so this isn't just some random electronic art curio.
string DACs
Love how they called it a "Professional designed o-ring transformer" in that thing.