Suboctave generator - 4013?

[Scott Gravenhorst]

Heh heh and I do x3, x6 and x12 (plus x1 x2 x4 and x8) by
putting those same counters in the feedback loop of a PLL.
But I use the 4027 and wire them JKs as toggle flops.  A
4027 can be any kind of flop you like, just by wiring the
Js and Ks correctly.

Harry, your pulse doubling: are you piping a square into
a differentiator then into a fullwave rectifier, then into a divide
by 3 ?

harry <harrybissell at prodigy.net> wrote:
>This is a REALLY good suggestion.  I'd do divide by three and six...
>Its possible to do pulse doubling from a square and get a divide by 3/2
>which is a fourth down.
>
>On this subject... a G is a fourth DOWN from C... but a G is the fifth scale
>step of the key of C.  So be careful... our suboctaves will generate the note
>"G" !
>
>This will sound like Keith Emerson  playing stuff from "Tarkus" which is
>fine by me !!!
>
>H^) harry
>
>Jim Patchell wrote:
>
>>     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
>

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