This is my second take on a multi phase waveform animator as described in EN#87 pg.3 ff by Bernie Hutchins. This time in stereo. This module takes a single sawtooth waveform (and others as well) and then uses nine phase shifters for each left and right channel to provide moving 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 for left and right channel. 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 with other waveforms as well.
This version is laid out for stereo use. The left input is normalized to the right input so you can make a dense stereo field output from one single input wave. All phase shifters have different frequencies.
Specs and features
- 2 x Nine independent phase shifters
- Volume control for all phase shifted waveforms
- Takes a lot more then only sawtooth inputs
- Mono in, stereo out
- Runs on +/-15V and +/-12V
- Power consumption around 120mA each rail
You can find a detailed description of the multi phase waveform animator in EN#87 pg.3 ff by Bernie Hutchins.
Sound snippet: Plain single mono saw input. No filters or effect
- Select the LFO frequencies to your liking according to the list in the downloads. You may want to us different values for the left and right side. I personally prefer the lower frequencies.
DownloadMulti Phase Waveform Animator control board documentation download
Multi Phase Waveform Animator control board Gerber files download
Multi Phase Waveform Animator main board 01 documentation download
Multi Phase Waveform Animator main board 01 Gerber files download
Multi Phase Waveform Animator main board 02 documentation download
Multi Phase Waveform Animator main board 02 Gerber files download
Multi Phase Waveform Animator feedback resistors list download
Multi Phase Waveform Animator *.fpd file