[sdiy] Cv octave shifter

[Ian Fritz]

This can also easily be done with one opamp stage using a generalized 
differential summer circuit.

   Ian

At 08:22 AM 7/18/2002, Theo wrote:

>Two cascaded inverting opamp circuits should do
>A inverting opamp can be used to sum signals.
>CV+1V = octave up
>CV-1V = octave down
>The sum will be inverted also; 5V+1V=>-6V
>Therefore you need a second inverting stage to get back to +6V.
>There are lots examples for this on the web, for example you may take a look
>here:
>http://www.play-hookey.com/analog/analog_addition.html
>Every thing you need to know for this project may be found at this site.
>
>HTH
>Theo
>
>
>
>From: Karl Ekdahl <_nial_ at yahoo.com>
>To: <synth-diy at dropmix.xs4all.nl>
>
> > Hi i want to make a simple octave shifter working on a
> > existing Cv line. just something to put in between my
> > keyboard cv out and vco cv in, two bushbuttons, one
> > for octave up and one for down.
> >
> > regards
> >
> > Karl Ekdahl