![]() Once C1 charges to 2/3 Vcc, the output is switched off by the threshold pin. Since the discharge pin is off, current can flow through resistors R1 and R2, charging capacitor C1. Whenever the trigger pin voltage is low, the output is on, and the discharge pin is off. This makes the voltage the same at the trigger pin, threshold pin, and C1.Īt the beginning of an on/off cycle, the voltage is low at C1, the trigger pin, and the threshold pin. In the schematic above, notice that the threshold pin and the trigger pin are connected to C1. In astable mode, the output cycles on and off continuously. Pin 7 – Discharge: When the output voltage is low, it discharges C1 to ground. ![]()
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