Suboctave generator - 4013?

[danial stocks]

4013... nice chip.. It is pretty much the standard choice for octave div.. 
Ive seen it used in other designs.. otherwise, some other chip in the cmos 
type fglipflop/counter could be used 74c74, or 4017 for selectable div etc.. 
these all need good bypassing to avoid supply glitches etc, but other 
choices would be non cmos flipflops [even more decoupling from supply 
spikes] or discretes..messy
Cheers,
Dan

>
>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

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