[sdiy] Linear/Log FM (was "Living VCOs" PCB in 2009 ?)

[Yves Usson]

I am puzzled, if so how can the MS20 VCO possibly work in V/HZ, the  
voltage from the
keyboard are sent to this so called modulation input.

Yves

Le 10 déc. 08 à 12:42, Tom Wiltshire a écrit :

>
> On 10 Dec 2008, at 11:19, Simon Brouwer wrote:
>
>> "Linear" on that type of modulation input means that the frequency
>> deviation has a linear relation to the modulation voltage. *This  
>> deviation
>> is proportional to the unmodulated frequency*.
>>
>> In contrast, Jürgens "linear detuning" control provides an  
>> independent
>> frequency offset.
>>
>> So with the linear modulation input (if it is not AC coupled!), or  
>> with
>> the normal fine tuning control, you could get a frequency  
>> deviation of
>> e.g. 1 Hz but this deviation would be 2 Hz that when you play a  
>> note one
>> octave higher.
>>
>> With the "linear detuning" you could set a 1 Hz deviation across  
>> the pitch
>> range. This way you can get a pleasant rate of beating between  
>> VCO's at
>> lower notes without them sounding too out of tune at higher notes.
>
>