[sdiy] Searching for a VC Clock schematic ......

[Scott Gravenhorst]

Samppa Tolvanen <samppa.tolvanen at gmail.com> wrote:
>On 12/30/05, Rykhaard D.A.M.I.A.N. <rykhaard at gmail.com> wrote:
>> On 12/30/05, megaohm <megaohm1 at gmail.com> wrote:
>>
>> >
>> > There's a really simple, few parts VC Clock that John Blacet wrote up for
>> Synapse magazine Volume 1 number 5 (January/February) under the title
>> Walking Ring Sequencer. Uses a 555 and a handful of parts. You can find it
>> on the Cyndustries website ("Goodies" link ). Maybe not good for what your
>> trying to do, but could be usefull to keep in mind.
>> >
>> > peng
>
>Could you like "ripoff" PAiA Fatman for linear FM? And add an expo converter?
>Roland System100m and System700 had a VC delay. (A small one, if You
>didn't use external CV on System100m - still it's NPN-PNP expo, right?
>Going to CD4024 osc?)
>
>Samppa

As a clock type VCO that works.  I've used the FatMan VCO 555's pin 3 output
to directly clock a flipflop for suboctave.  The caveat is that the 555 (or
7555 in my case - worlds better IMHO) sits below ground, so if you want the
clock to operate with logic devices powered by a positive supply, level
conversion is needed.  I don't think that's a big deal though.







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