[sdiy] Capstone: Modular Analog Synth

[Seb Francis]

Andre Majorel wrote:
> On 2006-09-25 12:03 -0400, Charles Bisaillon wrote:
>
>   
>> I've come up with the following specifications for our project.
>> Can someone please tell me if I'm on the right track, or if I
>> should change something.
>>
>> Power Supply: +/- 15 V
>> Pitch Control: 1 Volt / Octave
>> Tuning: Middle C = 440 Hz
>> Control Voltages: 0-10 V
>>     
>
> I've lost context so pardon me if this does not apply to your
> application but :
>
> A workable tuning standard for VCOs is 5 V = 440 Hz. That's
> convenient because it joins two commonly available references. It
> gives you 0 V = 13.7 Hz and +10 V = 14.1 kHz.
>
> For a frequency range centred around 20 Hz - 20 kHz, you'd have to
> specify 5 V = 632.45 Hz (or 440 Hz = 4.4765 V), giving you 0 V =
> 19.8 Hz and 10 V = 20.2 kHz.
>   

Personally I use 0V for C3 (=MIDI note 60) which gives -5V for C-2 
(=MIDI note 0) and +5V for C8 (=MIDI note 120).  But you could just add 
5V to everything to get a 0 to 10V range.

Seb