Precision-audio-waveform-generator

  
This circuit generates sinusoidal, square, and triangle waveforms simultaneously. Set the frequency to a particular value or vary it, as-shown above. An op amp can be added for extra drive capability and simplified amplitude adjustment.
Precision-audio-waveform-generator - schematic

A simple comparator, slicing the triangle waveform, provides continuous duty cycle adjustment at a constant frequency.




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