The sawtooth output waveform is the signal "saw" available at the output of op amp U1A. Its frequency is set by the value of resistor R6 which can vary from 120 Ω to 12 MΩ

AuthorsChristopher Paul
Main DocumentArticle «Self-oscillating sawtooth generator spans 5 decades of frequencies»
DescriptionFigure 1
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The sawtooth output waveform is the signal saw available at the output of op amp U sub 1A /sub  Its frequency is set by the value of resistor R sub 6 /sub  which can vary from 120 Ω to 12 MΩ