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To design and implement decoder using basic logic gates.

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Apparatus required:-The following electronics components are required.
·         NOT Gate (IC-7404)
·         AND Gate(IC-7410)
·         Digital IC Trainer KIT
·         Connecting wires
Description:-
A decoder is a multiple input multiple output logic circuits which converts coded input into coded output where input and output codes are different. The input code generally has fewer bits than the output code. Each input code word produces a different output code word i.e there is one to one mapping can be expressed in truth table. In the block diagram of decoder circuit the encoded information is present as n input producing 2n possible outputs. 2n output values are from 0 through out 2n – 1.
Symbol:-
Truth-table for Encoder:-

INPUT
OUTPUT
E
A
B
D0
D1
D2
D3
1
0
0
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
1
1
0
1
0
1
1
0
1
0
1
1
1
1
1
0
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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