[sdiy] MS-20 tempco (was Model D service)

[Michael E Caloroso]

There can be conditions where a v/hz VCO is sensitive to temperature.
Garden variety opamps have offsets that varied with temperature.  You
wanted to keep the low end of expo CV out of the range of those
offsets.  That's why v/hz synths are designed with a limited pitch
range.

MC

On 5/9/17, Quincas Moreira <quincas at gmail.com> wrote:
> I imagine it can be modded to receive key tracking after the expo
> converter?
>
> On Tue, May 9, 2017 at 9:39 AM, Andre Majorel <aym-htnys at teaser.fr> wrote:
>
>> On 2017-05-09 10:17 +0200, Roman Sowa wrote:
>>
>> > It's like discussing what is better: linear of exponentional
>> > FM. Each has their uses. IMHO the old Korg's approach to the
>> > subject is the best - note pitch in Hz/V, the rest in oct/V
>>
>> There is a cost, though. In the MS-20, the keyboard produces
>> linear CV but the VCF takes exponential CV so you can't get the
>> filter to track the keyboard. Unless you happen to want 50%
>> tracking over the bottom octave and 200% over the top octave.
>>
>> --
>> André Majorel http://www.teaser.fr/~amajorel/
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>
>
>
> --
> Quincas Moreira
> Test Pilot at VBrazil Modular
>