[sdiy] Vactrol control ideas wanted

[Harry Bissell Jr]

I'll have what the gentleman on the floor
is having....    ;^P

H^) harry

--- Peter Grenader <peter at buzzclick-music.com> wrote:
> A Panner.  Seems to me, with the inherent
> slow-motion release of the
> vactrol, it's a perfect candidate for panner
> applications in that it would
> more than likely smooth out the dreaded 3 dB drop in
> the center.
> 
> Sounds reasonable.
> 
> Another great vactrol application - little men. 
> With two leads coming out
> the top (arms) and two coming out the bottom (yes,
> you've got it - legs),
> you've got the makings of a one heck of a swell man.
>  Hell, his torso would
> be somewhat shaped like Bob Moog's anyway.
> 
> You just need a head, and this is where your
> tantilum cap comes it. Any
> value should do.  Little shoes from switch caps, a
> tie zip-tie belt and
> bingo - a little companion to sit with you while you
> solder.
> 
> huh?
> 
> - P
> 
> 
> 
> 
> 
> 
> 
>  René Schmitz wrote:
> 
> > Hi Harry,
> > 
> > 
> >> I'm planning a vactrol based phaser module (yeah,
> I know...
> >> how original :^)
> > 
> > In my tube based phaser I've used three expo
> convertors of the ARP-Style
> > (PNP/NPN). Its a six stage design, and this allows
> me to offset two of
> > the vactrols with respect to the third one. By
> that I get a "notch
> > spreading" control (one expo receives the
> Spread-CV directly, the other
> > inverted. I found this to be easier than to
> experiment with different
> > caps, and the big plus is you can change the
> character with a front
> > panel control. (I didn't bother to bring out a CV,
> but that would be
> > straight forward.)
> > 
> >> 2) Control the Vactrols by running them all in
> series, with one
> >> Photocell fed
> >> back into the control circuit.  This is an
> adaptation of the National
> >> Semiconductor
> >> "Analog Multiplier" found in AN-20.  However,
> this version will not have
> >> one LED
> >> illuminating multiple photocells.
> >> 
> >> pro: (subject to matching) the photocell
> resistance can be accurately
> >> specified
> >> con: its more complex
> > 
> > con: you also loose the dynamic property of the
> vactrol.
> > 
> > Cheers,
> > René
> 
>