Building a Classic LED Chaser Circuit Using 555 Timer and CD4017

LEDs are one of the first components most of us experiment with in electronics. Beyond simple blinking, they can create eye-catching patterns like running lights, festival decorations, and dynamic display effects. In this project , we’ll build a classic LED Chaser Circuit with 555 Timer IC using two popular ICs: NE555 Timer IC CD4017 Decade Counter IC With just a few basic components, you can create a smooth running light effect that’s perfect for learning digital electronics or building decorative lighting projects. What Is an LED Chaser Circuit? An LED chaser circuit is a setup where LEDs turn ON one after another in sequence, creating a running or chasing light effect. Instead of all LEDs blinking together, only one LED glows at a time. As clock pulses arrive, the active LED shifts to the next one, forming a continuous moving pattern. This effect is widely used in: Decorative lighting Festival displays Sign boards DIY electronics projects Digital logic demonstrations Components Requ