[sdiy] Enveloping Envelopes

David G. Dixon dixon at interchange.ubc.ca
Thu Sep 24 18:28:44 CEST 2009


I built the MFOS ADSR in a custom dual layout, with a few bells and whistles
not included in Ray's published circuit, including AR repeat mode and extra
inverted outputs.  I managed to fit both circuits onto a (very densely
stuffed) 4" x 6" PCB.  Please email offline if you're interested in
receiving my design files.

The circuit could possibly benefit from another rate control for expanding
or shrinking the entire envelope -- just one more pot, but I don't know
where I'd put it.  Also, it might be nice to put the circuit under voltage
control.  I managed to fit all the controls (8 pots, 2 buttons, 4 switches,
and 8 1/4" jacks) onto a pseudo-MOTM-format 2U x 5U panel.  It is very nice
to use, and generates very nice, traditional, exponential-decay envelopes
from 0 to 10V.

I will probably build another one just like it before too long.

> Envelopes envelopes envelopes...
> 
> Which is your favorite design of EG and why? How many do you
> have/need/want? How do you use them aside just running VCAs and VCFs?
> 
> I'm ultimately just trying to decide which kind(s) to build, but I'm open
> to tips, tricks and other amusing anecdotes. So please, do tell!
> 
> 
> _Kyle
> 
> http://de-engineered.livejournal.com/
> 
> 
> 
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