Electronics by Manmohan Pal: LED Chaser

LED chaser circuit using IC 555 Timer and 4017 Decade counter by Manmohan Pal

Sequential running LED lights

Using IC 555 Timer and IC CD 4017

LED Chaser circuits using IC 4017 + IC 555

If you want to build a 10 LED Chaser circuit we suggest this circuit first. It uses popular IC is a simple and affordable IC-4017_decade counter and IC-555.

As circuit diagram below is LED chaser circuit which The CD4017 act as LED driver in 10 output, by LED will glow only one in a rapid sequence. And control to speed with VR1 which is setting frequency output of a basic astable or free-running pulse generator with IC-555 as main.

10 LED Chaser Circuit

This is the circle 10 LED running light as another kind of string light circuit. Which is running light on circle each one step beautifully and can adjust speed as well.
The working principle
From circuit will see that we use two ICs. Which is IC1-NE555 as timer IC with a widely used general. In this circuit will use the IC-555 as the square wave generator to output. Which that frequency is determined by R-2.7K, R-470 ohms and C-10uF 16V.

In addition yet has a VR1-potentiometer-10K is frequency adjuster. When IC1-NE555 generate the frequency up, will be entered to IC2-CD4017 by through way of R 100 ohms. IC2 is Decade Counter IC will provide output is positive voltage Sort by Position according to input signal from IC1-NE555 One end of the LED all. Which is pin K to pooling through R 1K to ground to as the through way of current.

Youtube link for easy LED chaser circuit

https://www.youtube.com/watch?v=Ohuu0gyTOBU

How to assemble circuits
You can build the PCB as layout in Figure 2. Then Put all parts in PCB as components layout in Figure 3. Firstly, put small components type such as R, C, LED and socket IC in to PCB. When solder finish, should check correctly. Next bring both IC insert in to socket, careful do not Wrong terminal. When check all thing correct then enter power supply into the circuit. Then, adjust trimmer potentiometer and noticed the running of LED if all what work normally so can use it now.

The components List.

1. IC-CD4017 Decade Counter IC -                  1 pcs.
2. IC-NE555 Timer IC-                                      1 pcs.
3. C-10uF 16V- Electrolytic capacitors-             2 pcs.
4. R-2.7K- Resistors- 1/4 W 5%-                        1 pcs.
5. R-470 ohms- Resistors- 1/4 W 5%-                1 pcs.
6. R_1K Resistors- 1/4 W 5%-                            1 pcs.
7. VR_10K__trimer-potentiometer- _                 1 pcs.
8. LED (any colour )                                        10 pcs.

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