74LS74 D Flip-Flop LED Toggle Circuit

Learn how to use the 74LS74 D flip-flop in a practical LED toggle experiment.

Materials Required

• 74LS74 D Flip-Flop IC
• Momentary push button
• LED
• 220Ω resistor
• Breadboard & jumper wires
• 5V Power supply

Circuit Diagram

Below is the circuit diagram for the LED toggle experiment.

Steps

1. Place the 74LS74 IC on the breadboard.
2. Connect the clock input to a push button.
3. Wire the LED to the Q output via a 220Ω resistor.
4. Set the D input to Q' for toggle functionality.
5. Connect power and ground accordingly.

Explanation

Each clock pulse toggles the LED between ON and OFF states.

Results

• The LED toggles with each button press.

Applications

Useful for binary counters, logic storage, and digital circuits.

Troubleshooting

• Check for loose connections.
• Ensure correct resistor values.

Conclusion

This experiment demonstrates how flip-flops are used in sequential logic circuits.