Thus the capacitor starts discharging through 10K resistor.When the charging voltage reaches to 2/3 of VCC, it is detected by the 6 th pin and it connects 7 th pin to the ground.Thus capacitor starts charging up to a voltage of 2/3 VCC.At the same time, 555 timer IC also gets supply voltage.
555 timer in multisim series#
This is because when the circuit is powered voltage is applied to the capacitor through two series resistors. By closing the button, one can observe LED glowing continuously with a delay of five seconds.3 rd pin.ĭo you know about the Working of Super Sensitive Intruder Alarm Circuit? Dummy Alarm Circuit Simulation Video: The LED with a resistor of 330 ohms is connected to the output pin from the timer i.e. In the circuit diagram, 8 th pin is not shown. 4 th pin and 8 th pin are shorted and connected to the battery. Other end of the resistor is connected to the battery of 4.5v. 7 th pin is connected between the two series resistors. Another resistor of 680 ohms is connected in series to the 10K resistor. A resistor of 10K is connected to the positive terminal of the capacitor. Negative terminal is connected to the ground. Pin2 and Pin6 are shorted and connected to the positive terminal of the capacitor. This output is applied to the high power LED, which flashes for every 5 seconds of delay.Īlso read the post – How Security Alarm Circuit Works? Dummy Alarm Circuit Diagram: Dummy Alarm Project Circuit Diagram This 7555 timer is operated in astable mode to continuously and produces the waveform. The circuit consists of 7555 timer IC as main component. The main principle of the circuit is to flash an LED for every 5 seconds.
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