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How decimal to BCD encoder works, truth table and applications
Typology: Lecture notes
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Encoders are the electronic equipment which converts one form of input into another one. Encoders are used to generate a coded output from a single active numeric input. Encoders are widely used in various devices like Calculators, Computers, Mobile phones, ATM machines and even also in our regular Television. IC-74147 provides us facility to convert Decimal form of input into Binary form of output. As it convert Human friendly numerical into machine friendly language i.e. in the form of ‘0’s and ‘1’s, hence it is quite important to study about this invention in very serious manner to understand that how this Decimal to BCD conversion operation perform. In our 21 st^ century we get digitalized day by day and decimal to binary Encoder performs very important role to communicate Human being with Machine.
In Decimal to BCD encoder binary output in the form of ‘1’s and ‘0’s which is calculated in encoder as below:
In above figure we arrange a circuit of Decimal to BCD encoder. There are four OR gates are arrange in such a manner that they provides a Binary form of output when we give Decimal form of input. In above circuit we arrange 10 key point which is connected to the electric supply and provides decimal from of input to the circuit by passing voltage in a certain wire. Every wire is connected to the OR gate. We know that output of every OR gate is ‘1’ when at least one input is high.
Working of a circuit:
When we press key 5 then by pressing key the voltage in the key no.5 flows towards the wire which is connected to the key no.5, as the wire connected to the 2 nd^ and 4 th^ logical gate then logical gate no.2 and 4 provides output to the forward in the form of voltage. This working of a circuit perform Decimal to BCD conversion operation.
Which is sho wn in belo w truth table .