Electronics Club

Electronics Club Introductory Lecture on Digital Electronics

Why Learn Digital ?? • Is it because computers are digital or the world is going Digital ?? • As Samsung says “The new realm of DigitAll Technology” • One to One functions • Virtually immune to noise • Easy to rectify mistakes ( Why?? )

What is Digital Electronics?? • A Digital circuit is based on a number of discrete voltage levels, as distinct from an analog circuit that uses continuous voltages to represent variables directly. • In most cases the number of states is two, and these states are represented by two voltage levels: one near to zero volts and one at a higher level depending on the supply voltage in use. • These 2 discrete states might be called “Low” and “High”, 1 or 0 , True or False. • Simple intuitive Boolean algebra !!!!

Wanna See Noise Immunity !!

What is common to Digital Circuits?? • Supply Voltage  5V (at the club ) • A term called CLOCK Will you change Mr. Logical One Mr. Clock Says : Yes Sir !! Right away Mr. Logical One Responds:

In Electronics Terms • A clock is simply a square wave , which is mostly common to all components put in a digital circuit. We may classify it as a parameter in measuring speed of the circuit. A Logical One 5V 0V A Logical Zero

The Binary Number System • Representing Nos. as a sequence of 1’s and 0’s. • Nos. in Base 2 • Decimal to Binary Conversion • Binary to Decimal Conversion • Intuitivism here too!!!!

Logic Gates • Simple Boolean functions • AND • OR • NOT • XOR • NAND • NOR

AND Gate Input 1(A) Input 2(B) Output (Y) Y = A & B

OR Gate Input 1 (A) Input 2 (B) Output (Y) Y = A | B

NOT Gate Input A Output Y Y = ~A

XOR NOR NAND XNOR Gates

Dear Transistor • Most simple use as a switch Supply Load Device Input

You did not understand something ??? • Read the handout • Even better come to the workshop • Lets work One to One  • Register for the workshop • Finally Be there !!!!

Thank You

Electronics Club