Introduction to Construction and Testing of Encoders and Decoders:
To study the function of Encoder and Decoder.
Components Needed:
S.no
Name of Component/Apparatus
Quantity
1.
2.
3.
4.
5.
6.
IC 74147
IC 74148
IC 7442 or 7447
7 segment display
Resistor 330W
LED
1
4
10
1. Encoder:
Encoder is a circuit that connect the human codes into machine code. It is employed for switching purposes in numerical code devices.
Decimal - BCD Encoder:
While we press the (0-9) switches. It is converted as subsequent BCD code. (That is Decimal to Binary) for that NAND gates are employed with IC 74147.Table shows the decimal to four digital binary.
0 0000
1 0001
----
9 1001
Example: when pressing switch 3, the o/p is shown like 0011.
Octal to Binary Encoder:
1. It employs IC 7448 and NAND gate.
2. It is employed to convert octal number into binary number. Instance, the number 537 is converts to binary code as 1101101011.
3. This circuit is employed to save and give the binary numbers.
4. In this we can also receive output for least value of the input.
2. Decoder:
Decoder is a digital mixer kind of circuit. Decoder converts the given digital code into essential corresponding number.
BCD to 7 segment Decoder:
Seven segment displays is most popular one. This decoder converts BCD into numerical form. Using Ic 744 the inputs and outputs are displayed in figure.
1. Encoder - IC - 74147 with LED-2
Figure: BCD - to 7 Segment D-Coder (2 digits - 7 pieces)
Figure: Decimal - BCD - Encoder (Decimals - Digits)
Figure: Octal - BCD - Encoder (Eight digits - Digits)
1. There are four inputs that are A, B, C, D and a to g seven outputs.
2. A to g outputs are connected to 7 segment LED.
3. 7 segment LED anodes are considered similar cathodes.
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