How to make a 7 segment decoder circuit from a 2 x 4 decoder with decoder as an input, also with additional basic logic gate?

 

You need to show your best attempt to work the problem. Then we can see what you are doing right and where you are going wrong.

Also, it would help if you gave the exact wording of the problem.

 

[Hint] Use 4* 2x4 decoders and a bunch of diodes for 0-9 decoding or
Use 5* 2x4 decoders for 0-F decoding.

Allen