Suboctave generator - 4013?

[harry]

ARP uses the same method in their "Little Brother" synth expander...

Glitches might make the triangle and sine a little dicey... but would work.
JH posted a Korg style VCO that has this circuit... its very cool.

H^) harry

Steve Ridley wrote:

> > Anyone use 4013-based sub octave generators in their designs?  Drawbacks?
> > Limitations?
>
> My main problem with squarewave sub-octaves is that I think they sound
> horrible.  You'll get an octave below, but you're stuck the squarewave's
> harmonics too, starting with a fifth above the VCO.
>
> A square wave divider is a start, but if you add the right amount of
> sawtooth
> from the VCO, you'll get a sawtooth a suboctave sawtooth.  I think some
> early Korg and Roland synths used this trick for octave switching on their
> VCOs.  Once you've got a suboctave sawtooth, it's fairly easy to convert it
> to a triangle and then a sinewave.
>
> A sub-octave sinewave is very useful.  It can add some "bottom end" weight
> without messing up everything else, and you can even add it after the VCF
> so you don't lose all that deep bass at high resonance settings.
>
> Steve Ridley