Simple Combination Lock
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| Schematic |
This circuit illustrates the use of XOR (Exclusive-OR) gates as bit comparators. Four of these XOR gates compare the respective bits of two 4-bit binary numbers, each number "entered" into the circuit via a set of switches. If the two numbers match, bit for bit, the green "Go" LED will light up when the "Enter" pushbutton switch is pressed. If the two numbers do not exactly match, the red "No go" LED will light up when the "Enter" pushbutton is pressed.
MATERIALS AND PARTS
- 4001 quad NOR gate
- 4070 quad XOR gate
- Two, eight-position DIP switches
- Two light-emitting diodes
- Four 1N914 "switching" diodes
- Ten 10 kΩ resistors
- Two 470 Ω resistors
- Pushbutton switch, normally open
- Two 6 volt batteries
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| IC 4001 NOR gate |
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| IC 4070 XOR gate |
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| DIP Switches |
Always use IC Base on PCB
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| IC Base |
PCB DESIGN
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i need a pcb layout of this plz
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