THE DESIGN AND IMPLEMENTATION OF AN ELECTRONIC SIGN PATTERN DISPLAY

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.

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. 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

Title Page

Declaration

Approval Page

Dedication

List of Table

List of Figure

Table of Contents

Abstract

List of Figures

Introduction

Literature review

Power supply

Rectification

Filtration

Design of sequential Counter

Design of the transistor/Relay Drive

Design of system timing circuit

Design of an interated timing circuit

Astable multivbrator

Asignchronous counter

Synchronous counter

Construction and packaging

Packaging

Problem encountered and solutions