From davebr at earthlink.net Sent Sat, Apr 20th 2024, 11:16
From davebr at earthlink.net Sent Sat, Apr 20th 2024, 11:16
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. Dave 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? > >Regards, >Stewart.