[sdiy] MIDI VCO Control - but not CV?

[Samppa Tolvanen]

Replying this to the list for reference. S.

On Tue, Jul 15, 2008 at 12:05 AM, Samppa Tolvanen
<samppa.tolvanen at gmail.com> wrote:
> Dear Cheater,
>
>
> On 7/14/08, cheater cheater <cheater00 at gmail.com> wrote:
>>
>>  I'm only talking about taking existing VCO designs, and modifying them
>>  to work in such a setup.
>>
>
> Yuep, and saying "Midi2CV" converters (/exponential converters) are
> troublish and coming up with design that's simply dis-satisfactory?
>
> What do You get from most of the existing designs = (sawtooth
> intergrator with) reset if You don't supply it with CV information for
> pitch? It just stays on some pitch - yes, You'll hard sync = reset it
> (what is done with comparator circuit in existing designs) from
> external pulse, that runs at fundamental frequency You're aiming at =
> You have generated a DCO to control VCO reset time.
>
> Your previously free-running sawtooth oscillator is now reset at Your
> DCOs will at the pitch You want, but at what point of it's cycle?
> Waveform created by "existing designs" rely on level set for
> comparator to reset the oscillator (hard sync) at certain point of
> integration. This keeps the amplitude constant and how fast this
> threshold level is reached is controlled by current coming from
> exponential converter, which is -by the way - controlled by so called
> CV.
>
> Samppa
>
> Yes, MSP is Your friend. Use it.
>