1. DENCODER  The dencoder is a device or a transducer or a circuit.The dencoder will convert the information from one format to another format i.e like electrical signals to counters or a PLC.The feedback signal of the dencoder will determine the position, count, speed, and direction.The control devices are used to send the command to a particular function.

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  1. 3. DECODER  The decoder is a circuit used to change the code into a set of signals.The name its self tells the decoder because it has the reverse of encoding.The decoders are very simple to design.
  2. 4. 3 TO 8 DECODER  This type of decoder is called as the 3 line to 8 line decoder because they have 3 inputs and 8 outputs.To decode the combination of the three and eight, we required eight logical gates and to design this type of decoders we have to consider that we required active high output. In the below table shows the decoding of the 3 line to 8 line decoder.To design this type of decoders we need active high output and for the given input combination the decoder output is one.The table shows illustration of the decoding and also a logic symbol of 3 to 8 decoders
  3. 5. From the truth table of three line inputs to eight line outputs, we can show the logic circuit.The logic circuit consists of three NOT gates and eight NAND gates. Enable pin of NAND gates are connected together.The NOT gates can generate the compliment of input and the NAND gates can produce the max in terms of each output.

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