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Question
realize a full adder from 3:8 decoder
 Question Submitted By :: Electronics-Communications
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
It is possible to build adder using decoders
But full adder has 3 inputs so you should be basically
using 3:8 decoder

The logic is simple for full adder there are 2 outputs -
Sum and carry
Now use the input of Full adder A B and C (previous carry)
as input to the decoder
Depending on the state of inputs the output line will be
either 0 or 1
now use a OR gate and OR the lines which have 1 output
during the desired state of inputs
apply the same for carry too
 
Is This Answer Correct ?    31 Yes 2 No
Golshan
 
Answer
# 2
solution given by gulshan is correct 
Is This Answer Correct ?    0 Yes 0 No
Vivek
 
 
 
Answer
# 3
it should consist equal ratio,because the adder send 3 and
decoder gets 8 its not possible to increase the level.
so no solution according to this quetion.
 
Is This Answer Correct ?    2 Yes 29 No
Raghava
 

 
 
 
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