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# LED Chaser by 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 Figure 1 is LED chaser circuit whicn 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.

The detail is other see in circuit picture better.

Circuit LED Chaser by IC 4017 + IC 555

This circuit is working in below.

When we experiment them as well next step we come to make…

## The circle 10 LED running lights

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.

Figure 1 The circle 10 LED running lighs circuit diagram.

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.

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.

Figure 2 Single-sided PCB layout and Components layout of this projects

The circuit use power supply between 3-15V but to convenience should use 9V rectangular battery to best suitable. All resistors use size Â¼ W. The LED will use all red or also use alternating red and green.

The components List.
IC-CD4017___Decade Counter Divider with 10 Decoded___________1 pcs.
IC-NE555____ Timer IC____________________________________1 pcs.
C-10uF 16V____Electrolytic capacitors_____________________________2 pcs.
R-2.7K______Resistors___1/4 W 5%_____________________________1 pcs.
R-470 ohms__Resistors___1/4 W 5%______________________________1 pcs.
R_1K_______Resistors___1/4 W 5%______________________________1 pcs.
VR_10K__trimer-potentiometer__________________________________1 pcs.
LED____as you need__________________________________________10 pcs.
etc.

# 4017 Led Pattern-Flasher

The circuit uses a 555 timer oscillator to supply clock pulses of a variable frequency to the 4017 decade counter. The decade counter only needs to have three outputs so the fourth output goes into the reset pin to start the cycle all over again. The central red led is always on. Each row of four leds flash in sequence giving the impression that the light is rotating. It is an idea that works very well giving an eye-catching display. It will run continuously for three hours with a standard pp3 battery.

Also This projects We recommend these below.

• #### gokul

use it
component not easily available

Hi,gokul
This circuit worked but you check again.

Superb!!!
Thanks a lot

Its Working

• #### arun

nice wrking SIR

• #### Sudheer Kushwaha

Can I have formula to calculate the pulse width/pulse frequency in this circuit??

It’s extremely urgent??
Kindly provide this..

• #### momename

Hi,
@royal rodrix kumta
@arun

• #### Mukesh

hi friend i tried this but only one led just glowing and it is not producing chasing effect..the 1st diagram(computerised one) and the working principle diagrams are diferent with the resistor valus please mail me how to do it please..thankq

• #### Pyae Phyoe Thwe Htoo

i study electronic in my university. i interest to build the circuits. but i want to know the concept of the components.

• #### momename

Hi,
@Mukesh
@Pyae Phyoe Thwe Htoo

• #### anantha.a.u

good job buddy!!!!

• #### vaibhav vats

Hello Sir,
i Am new in electronics. can u please help in making the led chaser with around 200 LED’s. Can you please send me the details of how to make 200 LED chaser with circuit diagram with its parts details.

Thanking You
Vaibhav Vats

• #### Bubai Das

can u please help in making the led chaser with around 200 LEDâ€™s. Can you please send me the details of how to make 200 LED chaser with circuit diagram with its parts details.

Thanking You
Bubai Das

• #### Fayaz

Can u clarify my doubt sir? where to see the output of “Traffic light controller using 555 and 4017 IC’s (Multisim software used)” sir.

• #### alex morfe

Hi! I have built the circle 10 led… it works fine but the slowest setting is still too fast than what i need.
Question: can i replace the 10k vr1 with 50k or 100k to make it go slower? If not, what should i do?

Thanks.

• #### chayapon

Hi,vaibhav vats
Now, I not have circuits as you need.
I am sorry.

• #### chayapon

Hi,Fayaz
Now,I not haveTraffic light controller.
I am sorry.

• #### chayapon

Hi,alex morfe
You can use the variable resistor 100k,50k.
But it hard to adjustable frequency than 10k.
However you can reduce capacitor C-10uf to 1uf

• #### alex morfe

hi chayapon,
thanks very much for the quick reply. i’ll try that

i have another question, but it is related to the dice circuit so i’ll just post it there.

thanks again.

• #### chayapon

Hi, alex morfe.
You are welcome.

• #### jinky

can you please help me how to make a project with 10 led lights using an IC to control the lighting of the leds.. what best IC will be used in order for the led lights to have a pattern in their lighting?. Thank you very much. im hoping for your immediate response.

• #### hine

hi..

can you help me to make 100 LED’s Led chaser using decade. How to connect several IC,s in sequence. thanks

• #### Arun

Then we’re is the 12th leg connect in ic 4017

• #### Arun

Then where is the 12th leg connect in ic 4017

• #### Akhil Vasu Narayanan

Dear Arun, 12th pin is “carry out” which is not required in this circuit.

• #### Charles Njogu

hi sir i need to know how to lay out the ic pliz help i don’t know the forward or the backward in order to avoid reverse bias

• #### momename

Hi Arun,
Not need to connects 12 pin. This circuit also works.

• #### pang

hai.can i know why the capacitors at the scematic circuit is not same from the list component at above.one the value is 10 and another is 1,but at list is both is 10.is that is same or not actually.

• #### alec

Hello , how about 50 leds ? Is it possible to series the led1 with 5 or more leds ? Pls reply , asap , I need your help , thanks

• #### momename

Hi Alec,
Thanks for feedback.
Now, I am sorry that cannot show you how to connect LEDs.
or http://www.eleccircuit.com/siren-light-from-running-light/

• #### saiet dey

Dear Sir please tell me the circuit diagram for making string light of 20 led light with blinking

• #### Pahan Bhagya

Hi saiet dey, I have an idea to make string light of 20 leds with blinking.(you will need extra 1- CD4017 IC, 2- PNP TRANSISTORS(such as A733), 2- NPN TRANSISTORS(such as 2SC828), 2- 1K RESISTORS and 1- 560ohm RESISTOR to upgrade this circuit .)

pcb

• #### hans sun

Thanks for the info mate

• #### kedaran santhakumar

thank you for the useless information

• #### momename

Hi kedaran santhakumar,

• #### Trav

Great write up, very informative to new people like me.
If the input source was 12V, would this circuit still work reliably?

• #### Allen Pitts

Hello,

“As Figure 1 is LED chaser circuit whicn The CD4017 act as LED driver in 10 output, by LED will glow only one in a rapid sequence”
needs to work on their English.

• #### naaga sampath

thank you sir.
we are doing this as our first project
thqnk you for providing this information…….

Good stuff!