[sdiy] Cheap Midi->CV

[simon.oo.o at xs4all.nl]

Hi Tony,

Oakley Sound zei:
>> So I was feeling quite comfortable choosing a 12 bit DAC for my next
>> project. I am not so sure about that now...
>
> 12 bit DACs are fine so long as you use the right 12 bit DAC and you
> don't expect the DAC to do any of the V/octave scaling adjustments.

Actually my plan was to do so (use the DAC for adjustment and compensation).

In Hal Chamberlin's book there is an example of VCO performance. After
calibration the frequency is 0.19% (3.3cents) off in the middle of the
range, and the temperature drift is 0.11% (1.9 cents) per degree Celsius
between 25 and 35 degC. So with a temperature difference of only 5 degC
the tuning would already be 13 cents off. He calls this "nearly perfect".
I wonder if VCOs can be made much more accurate these days?

Vriendelijke groet,

Simon Brouwer
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