This is my take on a multi phase waveform animator as described in EN#87 pg.3 ff by Bernie Hutchins. This module takes a single sawtooth waveform and then uses nine phase shifters to provide shifts from 0° to 360°. These shifts are controlled each by an independent oscillator which operates on a frequency of about 0.01Hz to 1.0Hz. The nine shifted waveforms are then mixed back together, along with original, to a composite sound. The volume of all phase shifted waveforms and the original are controlled with potentiometers. So you can dial in any amount of animation you like. You can choose from a variety of frequencies for the phase shifters. The method used here is described in EN#40 by Ralph Burhans. Ralph found that if you space frequencies at the fifth root of 2.1, you get no harmonic overlap over a 10 octave range. This is important because we don’t want to produce patterns which will repeat and be detected by our ears to keep the sound animated. As you can see in the screenshots you can use this module for other waveforms as well.
Specs and features
- Nine independent phase shifters
- Volume control for all phase shifted waveforms
- Takes a lot more then only sawtooth inputs
- Runs on +/-15V and +/-12V
- Power consumption around 35mA each rail
The documentation and the Gerber files for download can be found in my website.
