A circular LED chaser is a simple electronic sequencer usually designed by combining a clock generating device with a counter. the input clock can be of any type such as an astable multivibrator, an inverter, logic gates, a pushbutton, or a dedicated timer IC. The counter can be any of several types including 4-bit, 8-bit, decade, or shift registers, depending on the number of outputs and other features. So, In this project, we are going to build a simple Circular LED chaser circuit using a CD4017 Decade counter IC. 

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Hardware Required

Circuit Diagram

Working Explanation

A NE555 timer is connected to the clock input of the CD4017 decade counter IC. The timer IC provides the CLK input of the decade counter with square wave input. CD4017 has 10 output pins and each pin joins to an LED. By default, the first output pin is on or high and the rest are off.