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. 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 Title Page Declaration Approval Page Dedication Acknowledgements List of Table List of Figure Table of Contents Abstract Description/Functions of Components Used with List of Figures 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