LED Chaser Circuit is a circuit in which the LEDs lights one by one for a period of time and the cycle repeats giving the running light appearance.

Here, I will show you three different ways to make a LED Chaser Circuit :-

1. 4017 IC

2. 555 Timer IC

3. Only Transistors

You can also control the speed of all the three circuits by varying the resistance.

Step 1: Components Required

These are the Components Required for making the circuit:

1. Using 4017 IC ()

• 4017 IC

• 555 Timer IC

• Potentiometer (10K Ω)

• Resistor: 1 K Ω

• Capacitor: 10 μF

• LEDs (10)

2. Using 555 Timer IC ()

• 555 Timer IC

• Zener Diode 1N4148

• Transistors: BC 547 (4)

• Resistors: 47K, 10K, 1K (2), 330Ω (4)

• Capacitors: 10 μF, 470 μF

• LEDS (4)

3. Using Only Transistors ()

• Transistors: BC 547 (3)

• Resistors: 100K (3), 2.2K (3)

• Capacitor: 10 μF (3)

• LEDs (3)

Other Requirements :

• Battery: 9V and battery clip

• Breadboard

• Breadboard Connectors

Step 2: Circuit Diagrams

These are the Circuit Diagrams for making the circuit using:

This video shows step-by-step, how to build all these circuits.