1:4 DEMUX using 1:2 DEMUX

4- BIT PARITY GENERATOR

Full subtractor

Full adder using universal NAND gate

Binary to gray code

8:1 Multiplexer

4:1 MUX using 2:1 MUX

1:8 DEMUX

Full Adder using DEMUX

2 BIT COMPARATOR

4 BIT PARITY CHECKER

Full adder using basic gate

Full adder using basic gate

BCD to Excess-3 code

Full subtractor using universal NAND gate

1:8 DEMUX using 1:4 DEMUX

1:4 DEMUX

4:1 multiplexer

BCD adder using 4-bit binary adder

8:1 MUX using 4:1 and 2:1 MUX