[sdiy] minimalist resistor ladder DAC intonation
jasonnanna at gmail.com
Tue Dec 18 00:05:10 CET 2012
Hi, I'm looking at building a minimal resistor ladder DAC as an
experiment with a Raspberry Pi.
I was hoping someone might have some ideas with respect to
temperament. What I'd like to accomplish is a direct bit-to-interval
relationship, so for example the LSB would correspond to a semitone,
the next-LSB would be a larger interval which could have the LSB added
to it to achieve the third pitch, and so on. Perhaps the LSB has to
be a microtonal interval to 'correct' certain others. I'd like it to
be 8 bits.
I don't require a general-purpose scale. I'm looking for something
musically useful. The octaves do not have to be 2:1 per se, and I
don't need a wide range of control voltage. The GPIO pins are 3.3v,
so I presume I'm going to have to scale the DAC output up to 4 or 5
volts, which would be the maximum control range I'd expect. Even 3
octaves would be sufficient. The music will (hopefully) suit the
tuning, not the other way around.
Hoping to get interesting ideas. Perhaps someone knows of a similar
project, but I haven't been able to find anything online to date.
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