# LED Chaser circuits using IC 4017 + IC 555

There are 5 circuits with PCBs about LED Chaser circuits or Running lights. They use IC-4017 to drive LEDs and IC-555 as oscillator pulse generator. It is best for beginner or for kids learn digital also my son love them see below!

## LED Chaser circuits 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 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.

The detail is other see in circuit picture better.

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.

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 ΒΌ 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.

## 7 LEDs light running adjust speed by IC 4017 and IC 555

The led light running circuit generally can not adjust the speed of running. Cause dull monotony. Resulting in an idea to build this circuit up. This circuit can adjust the speed of the led light as needed. Makes this circuit can be used more versatile.

Operation of the circuit is divided into two parts: frequency generators. And the display. By the frequency generator IC1 contains a number Ic timer circuit 555 and frequency generator. Defined by the R1, VR1 and C1 will be the output signal at pin 3 of IC1 sent to display section.

In display section consists of IC2, a number CD4017 IC Counter circuit is displayed by the volt at pin 3, 2, 4, 7, 10, 1 and 5, respectively, each pin. The speed depends on the frequency count obtained from pin 14 of IC2, which we can adjust VR1 adjusts the frequency from the frequency generator part.

My son play this circuit enjoy!

## Simple 12 LED running using CD4017 and NE555

Here is a simple 12 led running lights circuit that use CD4017 and NE555 as based of circuit. It like the two way 12 LED running lights using CD4017 and NE555.

Which it use 12 LEDs only. There are a interated running form. To begin with LED flash from the center to the edge on both sides. Then, to runs back to the center again. Like this indefinitely. Until the battery will fully lose or the switch opened circuit.

How it works
This circuit include a few parts. It may be divided into two section as follows:
1. the pulse signal generator
2. The counter
1. The pulse signal generator section include IC1-555,R1, VR1, C1 and C2. The output signal at pin 3 will be the square wave,that can be adjusted frequencies by VR1.

Then, send the signal to the input of IC2 that is the decade counter circuit. The IC2’s pin 14 will count the input signal continuously, and show at the output “1β on pin 3, 2, 4, 7, 10, 1, 5, 6, 9, 11 respectively.

The connecting LEDs to display in this circuit will see that is LED running two way from middel.

Parts you will need
IC1_____NE555__Timer
IC2_____CD4017___Decade counter with 10 decoded outputs IC
C1______3.3uF 16V___Electrolytic Capacitors
C2______0.01uF 50V__Ceramic Capacitors
R1______4.7K__1/4W Resistors tolerance: 5%
VR1_____100K Potentiometer
LED1-LED12___as you like
The power supply is 5V-12V