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

[Roman Sowa]

The expo pair in MS20 is used only for modulation and external V/oct 
sources, while keyboard pitch is provided as linear voltage (Hz/V) 
derived from stable source. So without any modulation, at ballanced 
state of the pair, when there's 0V between bases, the VCO core current 
is not dependent on those transistors and their temperature effects.

That's one of the beauties of Hz/V systems, it's so easy to make the 
pitch stable.

Roman

W dniu 2017-05-09 o 01:48, Declare Update pisze:
> wait a second... no tempcos in the MS-20? what's with all the special resistor symbols in the schematic? and how does that super common and known-to-be-temp-dependent expo converter not need compensation?
>
> Chris
>
>> On May 7, 2017, at 4:14 PM, Michael E Caloroso <mec.forumreader at gmail.com> wrote:
>>
>> That's the one...
>>
>> MC
>>
>>> Anyway, I think Michael E C was referring to this posting of his:
>>> http://search.retrosynth.com/ah/search/lookit.cgi?-v9901.2166
>>
>>
>>> On 5/7/17, Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:
>>>
>>>> On 7.May 2017, at 19:48 , Michael Zacherl <sdiy-mz01 at blauwurf.info> wrote:
>>>>
>>>>> On 7.May 2017, at 19:04 , Quincas Moreira <quincas at gmail.com> wrote:
>>>>>
>>>>> Michael, thanks for saving me frustration, I will refer to your
>>>>> instructions.
>>>>
>>>> uhm .. I didn’t do anything -
>>>
>>>
>>> whoops  *blushes* … the other Michael.
>>>
>>> Anyway, I think Michael E C was referring to this posting of his:
>>> http://search.retrosynth.com/ah/search/lookit.cgi?-v9901.2166
>>>
>>> sorry, Michael E C, Michael.
>>>
>>>
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