ONE FILTER THREE PHASE SINE WAVE GENERATOR

  
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It is possible to build a three-phase sine-wave oscillator using just one UAF42 state variable filter along with some resistors and diodes. Three output nodes are available: high-pass out, bandpass out, and low-pass out. The signals at the bandpass and low-pass out nodes are 90 °and 180 ° out of phase, respectively, with those at the high-pass out
ONE FILTER THREE PHASE SINE WAVE GENERATOR - schematic

node. An on-board auxiliary op amp is available for use as a buffer or gain stage. The frequency of oscillation is set with resistors RF1 and RF2 using the simple equation:



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