[sdiy] Three Leg Photocell Hunt

[Kyle Stephens]

Heh, those Buchla circuits are always fun to take a gander at. Can't recall ever seeing 7 Vactrols not in a switching scheme circuit ever either!

"Mod index" is wet/dry blend basically, right?

And how goes the Buchla Timbre Modulator btw Aaron?


_Kyle

--- On Wed, 3/31/10, Aaron Lanterman <lanterma at ece.gatech.edu> wrote:

> From: Aaron Lanterman <lanterma at ece.gatech.edu>
> Subject: Re: [sdiy] Three Leg Photocell Hunt
> To: "synth-diy DIY" <synth-diy at dropmix.xs4all.nl>
> Date: Wednesday, March 31, 2010, 1:02 PM
> 
> On Mar 30, 2010, at 3:48 PM, Tim Parkhurst wrote:
> 
> > On Tue, Mar 30, 2010 at 12:09 PM, Kyle Stephens <lightburnx at yahoo.com>
> wrote:
> > The trick though, is that to simulate a pot being used
> as a voltage
> > divider, you'll want two photocells with one going up
> in resistance
> > while the other goes down. I can't see how this would
> work with both
> > cells in a single package. You might be able to get
> the proper
> > response by using two photocells, and driving one with
> an inverted
> > copy of the LED control voltage.
> 
> For an example of something like this, see the crossfader
> in the balanced modulator in the Music Easel:
> 
> http://rubidium.dyndns.org/~magnus/synths/companies/buchla/Buchla_2080_5_200.jpg
> 
> (upper right part of the schematic)
> 
> - Aaron
> 
> 
> 
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