V/Oct >> Hz/V converter circuit?

[Scott Gravenhorst]

I believe that all analogue VCO designs have at their heart, a 
linear (v/hz) VCO.  V/oct VCOs have what is called an exponential
converter or expo converter that translates the incoming v/oct
control voltage to linear (v/hz) which then controls the oscillator.
You should look at schematics of the v/oct VCOs, many are up on the
web, to see how this is done.  It boils down to a couple of transistors
in a very simple configuration.  The problem is that this arrangement
is sensitive to temperature and needs some kind of compensation to
keep the synth in tune in a reasonably wide tempurature range.  There
are several ways to do this, each with advantages and disadvantages.


"||| Philip Pilgrim |||" <thelab at sprint.ca> wrote:
>I just chopped a CS-10 and am about to make it "modular" I would 
>like to convert it to v/oct. Is there a simple front end circuit 
>I could install? Couldn't find anything on the net :( Philip 
>Philip Pilgrim The Lab 5 Evan's Drive Synth Mods/Repair Hammond's 
>Plains Software N.S. Canada http://www.robotnik.com/the_lab B4B 

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