Oscilloscope triggered sweep circuit

  
The circuit`s input op amp triggers the timer, sets its flip-flop and cuts off its discharge transistor so that capacitor C can charge. When capacitor voltage reaches the timer`s control voltage of 0.33 Vee. the flip-flop resets and the transistor conducts, discharging the capacitor.
Oscilloscope triggered sweep circuit - schematic

Greater linearity can be achieved by substituting a constant-current source for frequency adjust resistor R.





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