[sdiy] Cheap Midi->CV

[Simon Brouwer]

Hi Andre,

At 00:32 11-9-2005, you wrote:
>On 2005-09-08 22:50 +0200, Simon Brouwer wrote:
> > At 00:01 8-9-2005, you wrote:
> >
> > >I don't need a frequency counter to know when a guitar string is
> > >7.3 cents off. So yes, probably.
> >
> > Sure you can hear it while tuning your instrument (if my calculation
> > is correct, at  e.g. 440Hz, a difference of 0.073 of a semitone would
> > give a beat frequency of about 2 Hz). I wonder if you would notice the
> > difference while playing, though, especially between different notes?
>
>I notice it while playing chords. And I don't have absolute
>pitch or golden ears or anything like that.

So do you mean that after tuning with one of the strings off by 7 cents, 
the guitar is noticeably out of tune during playing?

> > A couple of years ago I built a MIDI2CV using an 8 bit DAC, using 4LSB
> > steps per semitone, for a range of 64 semitones (more than 5 octaves).
> > I found this quite usable, not really out of tune.
> > If I remember correctly, this DAC (a ZN426) had accuracy specified at
> > better than 0.5 LSB which would be a factor 2 worse than a 12 bit DAC
> > with 2 LSB accuracy if used for a range of 10 octaves.
> >
> > So I was feeling quite comfortable choosing a 12 bit DAC for my next
> > project. I am not so sure about that now...
>
>Depends. Does it have one or several channels ?

Several, but only one for controlling the main pitch (the project is a 
monophonic synth).



Vriendelijke groet,
Simon Brouwer.

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