[sdiy] Cv octave shifter

[Theo]

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
>
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