[sdiy] 1v /oct with ADC question

Vinicius Brazil brazil.v at gmail.com
Thu Dec 1 03:35:33 CET 2016


Hi Mike,

A small read error in the initial email.
I understood DAC in place of ADC.
Now I understand your application correctly.

regards,

Vinicius Brazil

On Wed, Nov 30, 2016 at 8:36 PM, <mskala at ansuz.sooke.bc.ca> wrote:

> On Wed, 30 Nov 2016, Mike HEQX wrote:
> > Yeah, it's more like a player piano so I really only need 61 actual
> binary
> > values. I also need the CV out and it just seems so convenient to pick
> that
> > off of the
> >
> > pot. It looks like the CV will have to generate 64 values at full scale,
> but
> > there will be 3 extra notes on the binary side. That's not ideal in this
> case.
>
> If you want the ADC output to have *only* 61 values, just decrease the
> maximum voltage on the pot to 61/64 of the ADC's full-scale voltage (for
> example, 4.766V if full scale is 5.000V), or increase the full-scale
> voltage of the ADC to 64/61 of the pot's maximum voltage (for example,
> 5.246V if the pot's maximum is 5.000V).  Either way, it'd be a good idea
> to have a trimmer on the voltage you're fudging, so that you can adjust it
> to compensate for stuff like ADC nonlinearity.
>
> --
> Matthew Skala
> mskala at ansuz.sooke.bc.ca                 People before principles.
> http://ansuz.sooke.bc.ca/
>
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