[sdiy] lots of VCAs on one PCB

[mark verbos]

If they are destined to be mixed together, you may want to try the old  
4049 hex VCA trick. I believe it was a Paia product originally. Can't  
beat the parts count on that one.

http://electro-music.com/forum/phpbb-files/hex_vca_312.jpg


Mark




On Nov 23, 2009, at 7:13 PM, Derek Holzer wrote:

> Howdy all,
>
> I'm looking at building a joystick controlled 4x4 matrix mixer,  
> which requires 16 VCAs when it's all added up. It would be for  
> control voltage, so a linear VCA is required. I've looked at the  
> Thomas Henry VCA, which is pretty simple and quite nice, but all the  
> layouts I've found for it are fairly large.
>
> It struck me that a vocoder would need approximately the same amount  
> of VCAs (depending on the number of analysis/resynthesis channels of  
> course), so there must be some layout someplace that has a lot of  
> VCAs packed together on one PCB board.
>
> Can anyone point me to a layout that packs so much into a fairly  
> small space (one Eurocard sized PCB 100x120mm)? Or a super basic  
> linear VCA schemo that could be laid out in such a way? Alternately,  
> is there anyone interested in working with me to design such a  
> thing? I'd be willing to invest something in getting PCBs made in  
> this case.
>
> Best!
> Derek
>
> -- 
> ::: derek holzer ::: http://blog.myspace.com/macumbista ::: http://www.vimeo.com/macumbista 
>  :::
> ---Oblique Strategy # 118:
> "Make what's perfect more human"
>
>
>
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