4-Bit Synchronous Down Counter

OR GATE

serial input serial output register

3 bit asynchronous counter

NOT GATE

OR USING NOR

GRAY TO BINARY

S-R FLIP FLOP

AND GATE

NOT USING NAND

NOR GATE

XOR GATE

NAND GATE

XNOR GATE

AND USING NAND

NOT USING NOR

AND USING NOR

XOR USING NOR

FULL ADDER

HALF SUBTRACTOR

HALF ADDER

FULL SUB

4bit Prime No.

4.1 multiplexer

1.4 DEMULTIPLEXER

2.4 DECODER

ODD PARITY

EVEN PARITY

BINARAY TO GRAY

ODD PARITY CHECKER

EVEN PARITY CHECKER

XNOR USING NAND

D FLIP FLOP

4-bit asynchronous up counter using suitable flipflop.

3:8 decoder

XOR USING NAND

XNOR USING NAND

8:3 ENCODER

4:2 encoder