[sdiy] Choosing a DAC
Sent Tue, Jul 7th 2009, 02:23
Set the DAC reference to 10.666 volts. That is 128 "exact"
semitones. In fact, a 7 bit "perfect" DAC would be absolutely in
tune. I used a 12 bit DAC on my project with a 10.666 volt
reference. The way I fine tune the 10.666 reference is to zero beat
the oscillators against my other standards. Just a thought.
At 02:57 PM 7/6/2009, Stewart Pye wrote:
>I'm designing an "analogue" sequencer around an AVR micro and I need
>to choose a DAC for the CV output. It will on only span 5 octaves
>(0-5V) and output only the equally tempered scale. (there will be a
>separate circuit for glide).
>I guess my question really is - how many millivolts can you be off
>by in a 1V/octave system before it becomes noticeable?