[sdiy] Hex Inverter VCF Idea

[adam at hoodmusic.net]

I found this in a note book that is about 5 or 6 years old, i am not sure
where i got the idea or what it came from,if anything. I just came accross
it and found it to be a intresting idea and wanted to see if it was
something actualy worth working with. I vaugly remember a phaser that used a
4049 in this manner so i might have gotten that part of it from there, but i
really am not sure. All that was in the notebook was what you see at the
link, something i drew in school.

adam

Scott Gravenhorst wrote:

> Is this your design?
>
> adam at hoodmusic.net wrote:
> >I found this idea for a 4-pole VCF with VC resonance and a VCA on the
> >output in one of my old note books. It uses 2 hex inverters, one for the
> >4 stages of the VCF and the VCAs for the resonance loop and output VCA,
> >and the other hex inverter is used as six FETs to very the resistance of
> >of each stage of the VCF and the VCAs. It is just a rough drawing, and
> >is far from a working filter. I wanted to know if it had any chance of
> >ever working before I started trying stuff ut in the real world.
> >
> >http://synth.massiva.com/vcf-4049.jpg
> >
> >adam
> >
>
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