LED light sequencer circuits

Here are LED light sequencer circuit that using IC-4017 and IC-555. The IC 555 timer generate astable multivibrator or low frequency oscillator. It sent to the IC-4017 will cycle through 10 count sequence. Next each LED, one at a time light up, and replay back to first. This is a sequence of flashing lights. We can adjust speed with resistor and capacitor on IC-555 circuit.

7 LED light sequencer circuit with adjust speed

The LED light sequencer 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 have two section: frequency generators and the display. Which 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.

LED light sequencer circuits
LED light sequencer circuits

In display section consists of IC2, a number CD4017-IC Counter circuit display 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 to set the frequency from the frequency generator.


My son play this circuit enjoy!

Simple 12 LED light sequencer circuit

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.

Simple 12LED light sequencer circuits using CD4017 and NE555

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 “1” 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
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


  1. Jacks04 August 18, 2018 Reply
    • ElecCircuit.com August 18, 2018 Reply

Add a Comment

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.