[sdiy] continuous tuning of analog oscillators

Jacob Watters jacobwatters at gmail.com
Thu Jul 11 16:17:09 CEST 2019


Speaking of phase lock, a PLL could work to do your auto-tuning. The code
in the processor would be similar to the DCO option (just use a squarewave
instead of a narrow pulse).

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


On Thu, Jul 11, 2019 at 10:10 AM ulfur hansson <ulfurh at gmail.com> wrote:

> also - in terms of generating waveforms digitally - i guess i’m much too
> enamoured with the alchemy of transistors, so it kinda takes the fun out
> for me... no gripes against digital at all though!!! i also do a lot of
> work in supercollider 😻
>
> i wish there was a divide down technique that wasnt phase locked. maybe
> bernie hutchins phase modulation circuit could liven things up a little,
> but it would grow big quite fast and not really provide the solution im
> looking for...
>
> Sent from outer space
>
> On Jul 11, 2019, at 14:05, ulfur hansson <ulfurh at gmail.com> wrote:
>
> DCO’s might be a good enough solution, but also has a host of problems to
> work through on its own... are there any good modern DCO
> examples/implementations out there?
>
> also - looks like korg figured out a way to pack the micros into a tiny
> enough space to be worth the trouble - i wonder how the new moog one
> handles tuning, perhaps a similar approach?
>
> Sent from outer space
>
> On Jul 11, 2019, at 13:28, Jacob Watters <jacobwatters at gmail.com> wrote:
>
> 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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>
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