[sdiy] Vco for BBD clock generation

[anthony]

Using a 4046 as a BBD clock has been done. By John Hollis for instance, but 
in commercial prodicts too. The Tycho Brahe (however it's spelled) Pedal 
Flanger used one and that's among the first ever flangers. You can see it in 
the pictures at modezero.com. (By the by does anyone have a schematic for 
that?)

Anthony


> Hi!
> If you need 1Volt/Octave accuracy, I'd suggest the SSM2031 High-Frequency 
> VCO chip, usually found in Seil DK-600s and such-like. This chip, when 
> paired with a good exponential convertor (You know; the whole MAT 02 
> kinda' thing), will provide square wave clock and notclock (inverted 
> waveform) signals at up to ?4? ?5? MHz. Plus, the tracking means that 
> phasing, flanging, or whatever will increase twofold for every octave 
> increase.
> If you don't need that kind of precision, though, I'd go with the 4046 PLL 
> circuit below. Mine dos centavos - GRIN! :->
> Your Hi-Freq. Pal,
> Dave Garf, basking in Sunday afternoon frequency...
>
>
> ----- Original Message ----
> From: Loscha <loscha at gmail.com>
> To: matrix <matrixsynth at gmail.com>; synthdiy <synth-diy at dropmix.xs4all.nl>
> Sent: Sunday, May 18, 2008 6:40:32 PM
> Subject: [sdiy] Vco for BBD clock generation
>
> http://www.flickr.com/photos/loscha/2503124435/
>
> As the description in Flickr explains,
> "Circuit for using a CD4046 PLL to generate a voltage controlled BBD
> complimentary phase clock! I found this ripped out page on it's own in
> a stack of magazines I purchased Yesterday; Sunday 18th of May, 2008.
> The previous owner was interested in the other side (some notes on
> there in pencil).
> Thanks to Hugo Bramall of Canterbury, Victoria who came up with the
> circuit and sent it ETI magazine in the first place!"
>
> The circuit is pretty low parts count. An op-amp (they suggest LM301
> in the circuit) and a CD4046 PLL. A few resistors, capacitors and a
> trimmer pot fill out the plan.
>
> I hope someone out there finds this useful, interesting or at least novel.
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