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To design and implement Encoder using basic logic gates.

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Apparatus required:-The following electronics components are required.
 ·      OR Gate (IC-7432)
·        Digital IC Trainer KIT
·         Connecting wires
Description:-
An encoder is a digital circuit that performs inverse operation of a decoder. An encoder has 2n input lines and n output lines. In encoder the output lines generates the binary code corresponding to the input value. In octal to binary encoder it has eight inputs, one for each octal digit and three output that generate the corresponding binary code. In encoder it is assumed that only one input has a value of one at any given time otherwise the circuit is meaningless. It has an ambiguity that when all inputs are zero the outputs are zero. The zero outputs can also be generated when D0 = 1.
Symbol:-
Truth-table for Encoder:-
            INPUT
OUTPUT
Y1
Y2
Y3
Y4
Y5
Y6
Y7
A
B
C
1
0
0
0
0
0
0
0
0
1
0
1
0
0
0
0
0
0
1
0
0
0
1
0
0
0
0
0
1
1
0
0
0
1
0
0
0
1
0
0
0
0
0
0
1
0
0
1
0
1
0
0
0
0
0
1
0
1
1
0
0
0
0
0
0
0
1
1
1
1
Procedure to Perform:-
·Take Digital Trainer KIT including Breadboard, ICs and connecting leads (wires).
·Insert ICs on the Breadboard.
·According to pin configuration of IC perform the connections.
·Connect VCC (+5V) to pin no.14 and Connect Pin no. 7 to GND of IC.
·Apply different input and observe output at LED.
·Verify the output according truth-table.
Conclusion: - All the output verified the result of Truth Table.
Precaution in lab:-
·         All the connections should be tight and proper.
·         Handle the ICs carefully.
·         Check the connection once again before Switching on the Digital Trainer KIT.
·         Switch of the Trainer Kit after performing the Experiment.

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