[sdiy] suboctaves

[Scott Gravenhorst]

Yeah, I saw that and I KNEW I would be taken
out to the woodshed for it...

harry <harrybissell at prodigy.net> wrote:
>OK Scott lets take this outside  ;^P
>
>I say "multiply by two and divide by three"
>
>YOU say "Multiply by three and divide by two"
>
>Hmmm... Well we are each going to get a fourth or fifth.
>
>But yours isn't a suboctave... its a fifth above...
>Mine is a fourth down... (suboctave)...
>
>But hey either way it a "C" and a "G"... right ?   ;^P
>
>H^) hary
>
>Scott Gravenhorst wrote:
>
>> matti <matti at devo.com> wrote:
>> >curently I'm using CD4017's to generate /2 and /3 subharmonics. This means
>> >six chips : quad opamp for quaring up, one 4017 for /2, one 4017 for /3,
>> >times two for both fatman voices.
>> >
>> >I'm wondering a few things : are there any chips that give multiple
>> >divided outputs? how do I accomplish /1.5?
>>
>> I did /1.5 by multiplying first by 3 then divide by 2.  The
>> multiplication happens in a PLL.  This method will yield a
>> symmetrical waveform.
>>
>> Also for a fatman, the 555 timer outputs a nice -12v pulse for
>> each reset on pin 3.  A CMOS counter setup to run from -12
>> and ground can be connected directly to pin 3.  I used a 4027
>> for my suboctave connected this way.  You could easily drive
>> your 4017s the same way and eliminate the squaring opamps.
>> Just put Vss to -12v and Vdd to ground.
>>
>> >
>> >thanks
>> >
>> >
>> >-
>> >finland red
>> >germany black
>> >egypt white
>> >
>>
>> =========================================================
>> - Government: The other religion.
>> - The media's credibility should always be questioned.
>> - Lambs who lie down with lions are lunch.
>>
>> -- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>> -- Linux Rex         | RedWebMail by RedStarWare
>> -- FatMan: home1.GTE.NET/res0658s/TekLab_FatMan_WebSite/index.html
>
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=========================================================  
- Government: The other religion.
- The media's credibility should always be questioned.
- Lambs who lie down with lions are lunch.

-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
-- Linux Rex         | RedWebMail by RedStarWare
-- FatMan: home1.GTE.NET/res0658s/TekLab_FatMan_WebSite/index.html