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# Composition

Submitted By alihossain
Words 263
Pages 2
DEPARTMENT OF Computer Science and Engineering

Digital Electronics & logic Design Laboratory

Experiment No-1: Characteristics of AND, OR and NOT gates

Objective:

To verify the input and output relationships/characteristics of 2-input AND, OR and 1-input NOT gates.

Required Instruments and ICs:

1. AT-700 Portable Analog/Digital Laboratory (or AT-800 Modular Lab, AT-701 Personal Lab)
2. 7404(NOT), 7408(AND), 7432(OR)

Circuit Diagram:

[pic]
[pic][pic][pic]

Procedure:

Step 1: Find out correctly the input and output pin numbers of each gate.
Step 2: Install the components of Fig 1-1 onto the breadboard of AT-700 and check properly the connections. Remember to connect each IC’s pin 14 to “+5V” of DC power supply of AT-700 and pin 7 to “GND”.
Step 3: Connect the Data switches “0” and “1” to point A and B of fig. 1-1 respectively. Then connect 8 bit LED Display’s “0”, “1” and “2” to the output of point Y1, Y2 and Y3 of Fig. 1-1 respectively. The connection diagram is as follows.
[pic]

Step 4: Change Data Switches “0” and “1” between “0” and “1” position and observe the situation of 8 bit LED Display “0”, “1” and “2”. The LED is light that indicates the output is in the logic 1 condition. When LED is dark, it indicates that the output is in the logic 0 condition.
Step 5: Record the results that you have observed into the truth table as follows.

Truth Table 1-3
[pic]

Discussion & Conclusion:
(On the basis of experimental results)

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