Suboctave generator - 4013?

[Jim Patchell]

    Sounds good to me....If you want to fool around, you might want to add a
divide by 3 as well, this will produce a tone down and octave and a fifth (I
think???), but, as I recall, division by 3 is musically useful.  I can't
remember if the 4013 is a JK flip flop or a D flip flop.  You an make a divide
by 3 very easily with a JK flip flop.

    -Jim

DCMagnuson at aol.com wrote:

> Hi List,
>
> I'm designing an outboard second voice for an SH-101, and I'm fooing around
> with VCO designs.  I want to add the suboctaves to the new VCO, like there
> are on the original VCO.
>
> The SH-101 uses a 4013 to derive it's suboctaves.  The 4013 is driven from
> the Saw wave, and creates pulse waves 1 and 2 octaves down.  By mixing the
> two they also create a 2 octave down pulse w/ ~25% duty cycle.
>
> Is this a good method of creating sub octaves, or is there a better circuit
> to use?  I like the extremely low parts count of the 101's design, but I
> don't know if it's a "good" method, or just a "cheap" method that will be
> compromised in quality.
>
> Anyone use 4013-based sub octave generators in their designs?  Drawbacks?
> Limitations?
>
> Thanks in advance
> Dave Magnuson