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two voltage thresholds are important to remember, and that is 1/3rd and 2/3rds of the voltage between pins 8 and 4 (sometimes called Vcc).
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| 2
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if pin #2 goes to a level below 1/3*Vcc, the ne555 will bring its pin #3 high, and the open collector output at its pin #7 to high impedance, or non-conducting.
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| 3
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if pin #6 goes to a level higher than 2/3*Vcc, the ne555 will bring its pin #3 low, and the open collector output at its pin #7 to low impedance, or conducting.
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| 4
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the 1k ohm connected from pin #3 to the Vcc provides current to charge the capacitor through the two resistors.
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