2-bit comparator

T Flip-Flop

1-bit Serial Adder

4:2 Encoder

4-bit Serial Adder

2-Bit comparator(less than operation)

4bit Binary to 4bit Gray Code

D flip flop and T flip flop

SR Flip Flop

2 bit Comparator

8:1 MUX using Logic Gates

4-bit Odd/Even

JK Flip Flop

4 bit Even Parity Checker circuit

Even parity generator

4*1 MUX

SIPO Shift Register

4-bit Odd Parity Checker

4-bit Asynchronous Up counter

4- bit EP Checker circuit

XOR using NOR gates

8-bit parallel Adder

4-bit Asynchronous Down counter

4:1 Mux using Logic Gates

4- BCD ADDER

Full Adder using Logic Gates

4-Bit BCD Adder

4-bit Subtractor using Parallel Adder and XOR Gates

Figure 4.2 A serial binary adder

Right Shift Register [SIPO]

Full Adder using 2, 4*1 MUX

1x4 Demultiplexer

3 to 8 Line Decoder

Shift Register - SIPO mode

74HC161