This document presents a password security system circuit designed by Md. Nahid Hasan using common logic gates. The circuit uses a 4001 quad NOR gate, 4070 quad XOR gate, switches, resistors, LEDs, and a battery. Diagrams show the pin layout of the ICs, the full circuit design, and instructions for connecting the components to create a basic password-protected switch.

1. GREEN UNIVERSITY OF BANGLADESH
PASSWORD SECURITY SYSTEM
PRESENTED BY
NAME: Md. Nahid Hasan
ID: 161001008

2. 1. REQUIRED EQUIPMENT
2. PIN DIAGRAM OF IC
3. CIRCUIT DIAGRAM
4. CIRCUIT CONNECTION
CONTENT

3. REQUIRED EQUIPMENT
• 4001 quad NOR Gate • Push-button switch
• 4070 quad XOR Gate • One 9V Battery
• Two eight-position DIP
switches
• Two Breadboard
• Two light-emitting diodes • 7805 5V voltage regulator
• Four 1N914 “switching” diodes • Connecting wires
• Ten 10k resistors and Two 470 resistors

4. PIN DIAGRAM OF IC
4070 quad XOR Gate TRUTH TABLE

5. PIN DIAGRAM OF IC
4001 quad NOR Gate TRUTH TABLE

6. CIRCUIT DIAGRAM

7. CIRCUIT CONNECTION

8. CIRCUIT CONNECTION

9. CIRCUIT CONNECTION