Digital technology has become so widespread that it encompasses nearly all aspects of our everyday lives and we can see its use in handheld gadgets, computers, robotics etc. This free book provides readers with a fundamental understanding of digital system concepts such as logic gates for combinatorial logic circuit design and higher level logic elements such as counters and multiplexers. Undergraduates taking a course in computer science, engineering or information technology will find it useful. Students enrolled in foundation year or pre-university courses will also benefit from the text.

1. Numher System Basics
   1. Decimal Numbers
   2. Other Number Systems - Binary, Octal and Hexadecimal
   3. Conversion between different numher systems
   4. Other number codes
2. In lroduction to Logic Gates
   1. AND gale
   2. OR gate
   3. NOT sale
   4. AND implementation with OR gale and vice versa
   5. NAND gate
   6. NOR gate
   7. Integrated circuits
3. Comhinatorial Logic Circuits
   1. Logic circuit simplification
   2. Boolean algebra
   3. DeMorgan's theorem
   4. More examples
   5. XOR and XNOR gates
4. Karnaugh Maps
   1. Sum of products
   2. Product of sums
   3. K-cmaps
5. Bistable Multivibrator Circuits
   1. S-R flip-flop
   2. J-K flip-flop
   3. D flip-Hop
   4. T Hip-flop
   5. Monosrable and astable multivibrators
6. Arithmetic Circuits
   1. Half adder
   2. Full adder
   3. Parallel adder
   4. Parallel addition using integrated circuits
   5. Parallel subtraction
7. Coders and Multiplexers
   1. Encoder
   2. Decoder
   3. Multiplexer
   4. De-multiplexer
8. Counters
   1. Asynchronous up-counter
   2. Asynchronous down-counter
   3. Asynchronous counters with incomplete cycles
   4. Synchronous counters