[sdiy] Korg MS20 Pitch to Voltage

[Andre Majorel]

On 2009-01-11 15:16 -0000, George Hearn wrote:

> Hi.  I know the Korg MS20 had a pitch-to-voltage input.  Can
> anyone point me in the direction of some schematics for the ms20
> or anyone information on this part of the system?

http://www.korganalogue.net/korgms/images/service/ms20/circ2.gif

It outputs a Hz/V CV so you'll need a log amplifier to drive a
1 V/oct VCO.

Also, the output is not very stable, even with a clean sine. Tried
playing a DX-7 into my MS-20's external signal processor and it
wasn't at all the same as playing the MS-20 from the keyboard. It
felt sort of wobbly and laggy. Wonderful for experimental noise
but not for more conventional music.

> Was it a PLL linked to the main oscillators?

I wouldn't know. :-)

-- 
André Majorel <URL:http://www.teaser.fr/~amajorel/>