Thursday, September 27, 2012
Wednesday, September 19, 2012
Test 3 - Filling Truth Tables
Two logic gates are the AND gate and the OR gate. Complete the truth tables for these two gates:
Test 2- Design a Logic Circuit for a Burglar Alarm System
Design a Logic Circuit for a Burglar Alarm System for a house which has 2 windows and 2 doors.
Friday, September 7, 2012
NAND & NOR GATES
The NAND gate
This is a NOT-AND gate, that is an AND gate followed by a NOT gate. It acts in the manner of the logical operation "and" followed by negation. The outputs of all NAND gates are high if any of the inputs are low. The symbol is an AND gate with a small circle on the output. The small circle represents inversion.
A NAND GATE with 3 input
The NOR gate
The NOR gate is a combination OR gate followed by an inverter. That is a NOT-OR gate is equal to an OR gate followed by a NOT gate. The symbol is an OR gate with a small circle on the output. The small circle represents inversion. Its output is "true" if all inputs are "false." Otherwise, the output is "false."
This is a NOT-AND gate, that is an AND gate followed by a NOT gate. It acts in the manner of the logical operation "and" followed by negation. The outputs of all NAND gates are high if any of the inputs are low. The symbol is an AND gate with a small circle on the output. The small circle represents inversion.
A NAND GATE with 3 input
The NOR gate
The NOR gate is a combination OR gate followed by an inverter. That is a NOT-OR gate is equal to an OR gate followed by a NOT gate. The symbol is an OR gate with a small circle on the output. The small circle represents inversion. Its output is "true" if all inputs are "false." Otherwise, the output is "false."
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