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.
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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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