Objective

The objective of this experiment is to utilize a CD4017 decade counter to divide the frequency of an input clock signal, demonstrating its capability as a frequency divider.

Components Needed

• 1 x CD4017 Decade Counter IC
• 1 x 555 Timer IC (for clock signal)
• 2 x Resistors (10kΩ and 1kΩ for the 555 timer)
• 1 x Capacitor (10µF for the 555 timer)
• 1 x LED (for output indication)
• 1 x Resistor (220Ω for the LED)
• 1 x Breadboard
• Connecting Wires
• Power Supply (5V)

Circuit Diagram

Procedure

1. Connect pin 1 (GND) of the CD4017 to the ground of the power supply.
2. Connect pin 11 (VCC) of the CD4017 to the positive voltage supply (5V).
3. Connect the output pin (Q0) of the CD4017 to the anode of the LED, and connect the cathode of the LED to ground through a 220Ω resistor.
4. Connect the 555 timer in astable mode to generate a clock signal:
• Connect pin 1 (GND) to ground and pin 8 (VCC) to 5V.
• Connect pin 2 (TRIG) to pin 6 (THRESH).
• Connect a resistor (10kΩ) between pin 7 (DISCH) and VCC.
• Connect another resistor (1kΩ) between pin 7 (DISCH) and pin 6 (THRESH).
• Connect a capacitor (10µF) between pin 6 (THRESH) and GND.
5. Connect the output (pin 3) of the 555 timer to the clock input (pin 14) of the CD4017.
6. Power the circuit. The LED will blink at a frequency that is one-tenth of the input clock signal frequency, demonstrating the frequency division.