FLASHING LIGHT
101％ working project hello friends today I am gonna telling you about some easy and valuable electronics projects for school and college practical
Flashing light produce blinking of light to get your attention. For example, the white, gleaming strobe lights of airplanes warn other airplanes to fly. There is a Flashing light circuit in which the LED flashes four times, turns off for a while and flashes four times again. The cycle keeps on repeating.
The circuit uses two NE555 timers to generate two different frequency patterns. Both NE555 ICs are wired in an unmistakable multi vibrator configuration. The frequency of IC1 is determined by resistor R1, preset VR1 and capacitor C1 respectively, and that of IC2 by resistor R3, preset VR2 and capacitor C4.
Output pin 3 of IC1 controls reset pin 4 of IC2 and, with the help of transistor T1, controls the strobe pin 13 ofIC3 . Whereas , output pin 3 of IC2 pro vides the clock frequency to decade counter IC3 . The high pulse at pin 9 of IC3 resets decade counter CD4017 Output pins 3 through 5 and pin 10 drive LED1 through diodes D1 , D2 , D3 and D4 , respectively .
The flashing rate of LED1 can be varied using preset VR1 and the re peat - rate is varied by pre set VR2 . The frequency of IC2 must be equal to or ten times greater than that of IC1 . The observed lighting sequence of LED1 is ' on off - on - off - on - off - on - off off - off ......- on - off on .....
You may use this strobe light on your radio controlled helicopter or mount in the headlamp of your bike or car. If you observe the sequence carefully, you will notice that it is similar to the one used by alarm clocks. Connect a buzzer to the output of the circuit to emulate the alarm.
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