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DESIGN AND IMPLEMENTATION OF ELECTRONICS SEQUENTIAL SIGN PATTER DISPLAY

LIST OF FIGURES

Fig. 3.1:      Block Diagram of a Dynamic Sign Display

Fig. 3.2:      Arrangement of the Pattern Display

Fig. 4.1:      Transformer Arrangement

Fig. 4.2:      Bridge Rectifier

Fig. 4.3:      Voltage and Current Waveforms

Fig. 4.4:      Full Diagrams of Power Supply

Fig. 5.1:      Four Bit Series in Parallel out Register Logic Circuit Arrangement

Fig. 5.2:      Clear and Shift Sequence

Fig. 5.3:      Circuit Diagram  for SR Ftip-Flop

Fig. 5.4:      Timing Diagram for SR Ftip-Flop Unclocked

Fig. 4.4.B:   Clocke Circuit

Fig. 6.1:      Transistor Switch/Relay Drive

Fig. 6.2:      Wave form of a Monostable, Fti-Flop

Fig. 7.1:      Astable Multivibrator

Fig. 7.2:      Internal Block Diagram of CMOS555 Timer

Fig. 7.3:      555CMOS Connection as a Multivibrator

Fig. 7.4:      555CMOS Connection as a Timer

Fig. 7.5:      555CMOS Connection as a Monostable Vibrator

Fig. 8.1:      Asynchroneous Decade Counter using Reset

Fig. 8.2:      Asynchroneous Decade Using Feedback

Fig. 8.3:      Timing Wave form

Fig. 8.4:      Pin configuration of Latch Counter

Fig. 8.5:      Circuit Diagrams of a Divided Counter

Fig. 8.6:      Complete Circuit Diagram of Electronics Sign Post

Fig. 8.7:      Complete Picture of Electronic Sign Post 

 

TABLE OF CONTENTS

CHAPTER ONE

Introduction

CHAPTER TWO

Literature review

CHAPTER THREE

Methodology

CHAPTER FOUR

Power supply

Rectification

Filtration

 

CHAPTER FIVE

Design of sequential Counter

 

CHAPTER SIX

Design of the transistor/Relay Drive

CHAPTER SEVEN

Design of system timing circuit

Design of an interated timing circuit

Astable multivbrator

Asignchronous counter

Synchronous counter

 

CHAPTER EIGHT

Construction and packaging

Packaging

Problem encountered and solutions

References

ABSTRACT

          This design implementation of this electronic sequential sign post display employs the use of some specialized components. This section of the project introduces the reader to the different section of the project and the components that makes them up.

          Emphasis are laid on describing the behaviour and operational system of the components as related to the project modeling, analysis, design and implementation of an ELECTRONIC SIGN POST, which is made up of a power supply, a shift register, a counter, multivibrator (555CMOSI.C) transistor, relay, resistors of different ohmic values capacitors, sensitive mic (for the switching system) and 220V AC lamp.

 

DESCRIPTION/FUNCTIONS OF THE COMPONENTS USED IN THE PROJECT

      POWERS SUPPLY/TRANSFORMER

          The power supply is culmed produce power required by the component to function. It coverts line voltage which is AC to DC and to a level that can be used by the various components. This is achieved by the use of a step down transformer to step down rectify, filtrate and regulate the line voltage.