Self Retriggering Timed Generator Circuit

  
When power is first applied to the circuit, 02 begins to charge via LED1, R3, and R4. When the voltage across C2 reaches Ul`s input trigger level, the output of Ul at pin 6 goes positive for a period that is determined by the values of and it! r That turns Ql on, discharging 02 through D1 and Ql. At the end of the set period, the output of Ul at pin 6 goes low, turning Ql off and allowing the current to begin flowing through LED1, R3, and R4 to gain charge 02, causing the cycle to repeat.
Self Retriggering Timed Generator Circuit - schematic

The repeat time is determined by the values of R3, R4, and C2. The previous formula won`t be as accurate for this circuit, but it will at least get you close enough for the capacitor value; then R4 can be fine-tuned to obtain the desired timing period.




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