[sdiy] LOG VCA?

[Tim Parkhurst]

Oh, crud. After all that "grammar and spelling" stuff, I go and pull
something like "but their was a Digisound ADSR module..." 

"THERE was," I MEANT "THERE was." 

Nothing like stepping on your own crank to start the day off right. ;-)



Tim (their saying I'm two crazy) Servo

"Imagination is more important than knowledge." - Albert Einstein




> -----Original Message-----
> From: Tim Parkhurst [mailto:tparkhurst at siliconbandwidth.com]
> Sent: Wednesday, June 08, 2005 11:13 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: RE: [sdiy] LOG VCA?
> 
> > -----Original Message-----
> > From: Paul Perry [mailto:pfperry at melbpc.org.au]
> > Sent: Tuesday, June 07, 2005 9:18 PM
> > To: synth-diy at dropmix.xs4all.nl
> > Subject: Re: [sdiy] LOG VCA?
> >
> > Aaron, as it happens, I am just this moment trying for a "one knob"
> > control to go from log thru linear to antilog
> > (over a 0 to 10 volt range say).
> > I guess there is a family of curves that at least LOOK something
> like
> > this? Any advice gratefully received.
> > Application is (among other things) reshaping envelopes. And
> > distortion.
> >
> > paul perry Melbourne Australia  (not an asistant prof, and
> especially
> > not in
> > a school of electical & comp eng)
> >
> > --
> 
> Hey Paul,
> 
> I don't know how much help this will be, but their was a Digisound
> ADSR
> module (designed around the Curtis 3310 EG chip) that used feedback to
> change the slope of the envelope segments. The standard shape is
> exponential, but increased positive feedback made the expo shape more
> pronounced, while negative feedback took the slope through (roughly)
> linear
> to reverse expo. Again, I'm not 100% sure how to apply this to a VCA
> response, but maybe the article will provide some inspiration. It's at
> an
> SDIY member's (Dave - sorry don't know the last name) excellent
> Digisound
> website
> 
> http://www.digisound80.co.uk/digisound/modules/80-10/construction/80-
> 10_ETI.
> pdf
> 
> As always, watch for the word wrap on that URL.
> 
> Have fun, and hope this helps!
> 
> 
> Tim (linear response, except on Fridays) Servo
> 
> "Imagination is more important than knowledge." - Albert Einstein
> 
> 
> 
> 
> 
> 
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