# LED Chaser circuit 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 ¼ 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.

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