Non-cycled phaser

[Ge_Whiz]

I was remembering a pedal a friend of mine had many years ago. It was an early phaser, but instead of the pedal position setting the rate of the phasing sound, it set the degree of phase, a bit like a wah but with the more pronounced sound of phasing. In other words, the pedal position replaced a LFO.

Anybody know what I'm talking about? Anybody know a schematic for this kind of phaser?

[Nasse]

Just take control voltage from pot connected to suitable d.c. voltage ( :?: ) instead from LFO. Maybe some range-setting resistors and smoothing cap against schratchy pot is needed.  Andertons EPFM book had something mentioned about this, and there was a ***cool*** sounding demo on included very thin vinyl record of envelope controlled phaser.

[B Tremblay]

The E-H Bad Stone was available in a rocker pedal which controlled the sweep.  JD Sleep has a schematic.

[puretube]

the E-H "Worm" does this, too - with the "Range"-pot;
when the slide-switch is being positioned from "auto" to "manual".

the schematic - however - is a "no-show".....

(ther are people known, who have implemented a jack
to replace the pot by a rocker-pedal...)






//www.puretube.com

[Mark Hammer]

A 1978 issue of POLYPHONY had a schematic for such a phaser, although the assumption was that it would be a synth module with an external LFO or other control-voltage source driving it.  As is typical of such modules, there is always an "initial" manual control.  Stick that in a footpedal and away you go.

And there is essentially your basics of a foot-controlled phaser design.  Just build a regular series of phase-shift stages and have all the FETS or LDRs driven by a single CV source that you can adjust via a foot-controlled pot.

FWIW, years ago I used to have one of those Anderton "Super Tone Controls" mounted in a wah shell.  The STC is exactly the same thing as the state-variable filter you find on the Mutron and other similar pedals.  If you combine lowpass and highpass outputs, you get a notch function.  Sweep that by foot and you essentially have the functional equivalent of a Phase 45, since 2 allpass stages produce a single notch.

[Ge_Whiz]

Many thanks and Happy Thanksgiving, y'all.

[Rodgre]

I wanted to mention that Morley's old pedal Flanger and Phasor did this. You could sweep them with the pedal, not an LFO.  

Thanks for bringing up Anderton's Super Tone Control. That and especially the Dual Filter Voicing Unit were two of my faves as a young'n.  I used that DFVU for years in my rack to get "my tone"....

Roger

[Jim Jones]

Hi Roger,

I forgot all about that Dual Filter Voicing Unit!  I always wanted to build that one but never did.  I thought it sounded great even on the flimsy sound sheet!  How did you package yours?  Was it bypassable or did you just leave it on?

Jim