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Quad-Phased Output LFO
The Quadrature LFO by Yusynth is a special module that was not found on many modular synthesizers back in 1970s. It was mainly companies like Polyfusion, Buchla and Serge that provided such a unique LFO.
The Quadrature LFO is a sine wave LFO with four outputs . The outputs run simultaneously but are phase shifted by increment of 90°. That is, the first output has a shift of 0°, the second 90°, the third 180° and the fourth 270°.
The module can be used to modulate up to four sources simultaneously at the same rate but out of phase. This makes it possible to produce “Barber pole” effects or “Shepard tones”.
For example, you can connect each output of the Quad-LFO to the 1V/Oct input of four different VCOs. This will produce continuous though steady rising and falling intermingled pitches.
The Quadrature can be used also to modulate four VC-panner channels to create rotating sound effects that fill the stereo space.
The core of the circuit is based on the quadrature oscillator circuit of Ian Fritz’s ChaQuO chaos oscillator . It has been modified in order to have voltage control of the frequency and also includes a toggle switch that makes it possible to exchange the phase of the 90° and 270° signals in order to change the direction of the phase rotation.
This simple feature is very handy when performing “Barber Pole” modulations.
Each LED indicates the positive part of the corresponding signal. The LEDs are organized in a diamond pattern to visualize the phase differences between the signals.
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