![]() The power supply voltage that might affect the operation of the timer. Some circuits (though rare) do use a resistor between the control pinĪnd Vcc to apply a small voltage to pin 5. Threshold voltage, which in turn changes the timing interval. The purpose of this pin is to monitor the MostĬircuits do not use this capability, though.Ħ is the threshold pin. Voltage across the capacitor that's discharged by pin 7. In most circuits, pin 7 is connected to the supply This pin is used to discharge an externalĬapacitor that works in conjunction with a resistor to control the Voltage reaches 2/3 of the supply voltage (Vcc), the timing cycle ends,ħ is the discharge pin.
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