[sdiy] lots of VCAs on one PCB

[Oscar Salas]

You will need 4 Tesseras:
http://electro-music.com/forum/topic-34297.html

There are two PCBs for each 4 VCAs and was thought for eurorack:
http://www.flickr.com/photos/81679980@N00/sets/72157617832804269/

I want to add a 5V reference voltage and trimmed control over each VCA gain for best unity gain performance, but like they are now work very nice.

Regards.


--- On Tue, 11/24/09, Derek Holzer <derek at umatic.nl> wrote:

> From: Derek Holzer <derek at umatic.nl>
> Subject: [sdiy] lots of VCAs on one PCB
> To: "synthdiy DIY" <synth-diy at dropmix.xs4all.nl>
> Cc: "Derek Holzer" <derek at umatic.nl>
> Date: Tuesday, November 24, 2009, 2:13 AM
> 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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