[sdiy] minimoog keyboard question

Ben Stuyts ben at stuyts.nl
Fri Jun 19 09:49:37 CEST 2020

I have this keyboard->CV pcb lying around somewhere from the late great Ray Wilson:

http://musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=SINGLEBUSSKEYBOARD2007/SINGLEBUSSKEYBOARD2007.php&VPW=1325&VPH=1199 <http://musicfromouterspace.com/index.php?MAINTAB=SYNTHDIY&PROJARG=SINGLEBUSSKEYBOARD2007/SINGLEBUSSKEYBOARD2007.php&VPW=1325&VPH=1199>

The article explains it pretty good.


> On 19 Jun 2020, at 03:45, Neil Harper <metadata at gmx.com> wrote:
> i was playing my be----ger 'model d' yesterday with a midi keyboard, and
> started thinking about how they keyboard on the original MiniMoog worked.
> it was basically a string of resistors, one between each key right? What
> kept the pitch CV constant after you let go of the key?
> does it use a sample and hold here? the little i know about sample and
> hold circuits, they all have a "droop" to them.
> http://mysite.du.edu/~etuttle/electron/elect53.htm says ~3mV/s, which
> would get pretty noticeably flat after only a few seconds.
> i had a quick squiz at the schematic but couldn't see or understand the
> relevant section.
> --
> /// Neil Harper
> /// Every Wave is New Until it Breaks
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