[sdiy] continuous tuning of analog oscillators

[Jacob Watters]

If you want to tune the oscillators continuously anyway, then why not use
DCOs? The signal is still analog, and the pitch is perfectly controlled
without the extra sampling and tuning code.

*Jacob Watters*
JacobWatters.com <http://jacobwatters.com/>
Tel: 226-886-3526


On Wed, Jul 10, 2019 at 5:03 PM ulfur hansson <ulfurh at gmail.com> wrote:

> hello list,
>
> I have a really nice synth voice up and running on my bench, and have
> always dreamt of making my own poly.
>
> all parameters are voltage controlled, but the tuning is... well... not
> perfect.
>
> currently I'm quite happy to omit oscillator FM, so in theory the
> oscillators would not "need" any modulation other than PWM.
>
> autotune feels a bit archaic at this point, so i'm wondering - a tiny
> microcontroller listening for zero crossings should be able to adjust the
> frequency of each oscillator for near perfect tuning, no?
>
> so far, i sadly haven't developed the skills required for digital
> solutions - but I wonder how crazy it would really be to implement
> something like this - can anyone think of a project / reading material that
> could help guide the way towards creating a tiny (preferably REALLY small)
> ADC/DAC listener circuit that could correct the resulting frequency of a
> sawtooth oscillator?
>
> it would be amazing to put 8 of these voices together with perfect tuning
> without any divide down or stepped interval solutions...... but then again
> it would also mean i'd need at least 16 micros to listen to all the
> oscillators at once!!
>
> any thoughts would be greatly appreciated, or even better yet - if someone
> would be interested in a collaborative effort, i'd be happy to send hand
> soldered smd prototypes between continents if necessary!
>
> many thanks,
> -úlfur
>
> --
> •
> ulfurhansson.com
> cargocollective.com/ulfur
> instagram.com/ulfur_
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