The LED chaser circuits are the most commonly used integrated electronic circuits. They are immensely used in various applications like in Signals, Words Formation system, display systems etc. the 555 timer IC is configured in astable state mode. The output of circuit changes continuously from its decoding and encoding phases. By that way the LED chaser circuit makes transition from one stable state to the other and vice versa. So let’s make our project and understand how our circuit is working.
Principle:
The rise and fall of the current across the LED is regulated by the proper terminology of 555 Timer IC. By default the first output of the circuit LED is at the rest or OFF. Whenever the clock is applied and trigger is simulated externally the shifting and transition of LED blink and flash takes place, this swapping of output is termed as the chaser circuit. Let’s make our project and understand its functioning practically.
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Circuit Diagram:Procedure:
1. Place the 555 Timer IC on the bread board with its notch facing up, as shown in the figure below.
2. Now connect Pin 1 of 555 Timer IC to the negative rail and Pin 8 to the positive rail of the bread board
3. Now place the bread board connectors between pin 2 and 6 of the IC and another one to the Pin 4 and 8 and shown below
4. Now place 1uF Capacitor with its negative terminal connected to the pin of the IC and positive terminal to the Pin 2 of the IC.
5. Place 1k Ohm resistor on the bread board with its terminal connected to the Pin 7 and 8 of the IC.
6. Now place 47K Ohm Resistor between pin 6 and 7 of the 555 Timer IC
7. Place 4017 IC on the bread board with its notch facing parallel to the 555 Timer IC as shown in the figure below
8. Connect pin 16 of the 4017 IC to the positive rail of the bread board and pin 8 to the negative rail
9. Connect bread board connectors between pin 8 and 13 of 4017 IC and another between pin 8 and 15.
10.Place 460 Ohm resistor on the bread board with one of its end connected to the positive rail and other end to parallel.
11.Now connect pin 3 of the 4017 IC to the first LED as shown in the figure according to the circuit diagram
12. Similarly Pin 2 to the 2nd LED, pin 4 to the 3rd LED, pin 7 to the 4th LED as per the circuit diagram
13. Further connect 5th, 6th, 7th, 8th, 9th and 10th
also as per the circuit diagram. Our circuit will look like this
14. Now connect the power supply as shown in the figure below to the respected rails of the bread board.
15. Now our LED chaser circuit is ready
16. The state of the LED will shift from one to other with the applied trigger at the input side of the IC
So this is the basic principle and working operation of LED chaser electronic circuit. So what are you waiting for do it and grab the practical knowledge.
Thank You.
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