CONSTRUCTION OF AN FM WIRELESS MICROPHONE

An FM wireless microphone modulated transmitter was designed and constructed using a frequency range of 104MHz and 108.7MHz. The audio input signal is by the means of an electret microphone fed into the circuit. The frequency modulator modulates the audio signal before it is being filtered. With the use of antenna, the radio frequency RF is then transmitted. This transmits on a frequency band of 108.7MHz and the transmitted signal can be received by any transistor radio within 30m away under a good weather condition.

TABLE OF CONTENTS

CHAPTER ONE

1.0       Introduction

1.1       Basis of Study

1.2       Purpose of the Study

1.3       Aims and Objectives of the Study.

1.4       Importance of Wireless Microphone

1.5       Justification

CHAPTER TWO: LITERATURE REVIEW

2.0       BACKGROUND

2.1       THE TRANSMITTER

2.3       REPRESENTATION OF AN AMPLIFIER

2.4       BLOCK DIAGRAM OF AN OSCILLATOR

2.5       THE COMPLETE CIRCUIT OF COLPITTS OSCILLATOR WITH ITS POWER SOURCE AND DC BAISING CIRCUIT.

2.6       ANALOG & DIGITAL SIGNAL

2.7       ELECTRONIC SYMBOL FOR A MICROPHONE

2.8       MODULATION

2.9       METHOD OF MODULATION

2.10     FREQUENCY MODULATION

2.11   TYPES OF MICROPHONE

2.12     RADIO FREQUENCY BAND

CHAPTER THREE: MATERIALS AND METHODS

3.0       WIRELESS MICROPHONE CIRCUITS AND COMPONENTS

3.0.1    CIRCUIT DESCRIPTION

3.1       TESTING

3.1.1    TESTING OF COMPONENTS BY MULTIMETER

3.2       SOLDERING

3.2.1   PREPARING THE SOLDERING

3.2.2   MAKING SOLDERED JOINTS

3.3     CONSTRUCTION TECHNIQUE

3.4       CONSTRUCTION PROCEDURES

3.5     TESTING OF THE CONSTRUCTED WIRELESS MICROPHONE

3.5.1    PERFORMANCE TEST

3.5.2    COVERAGE Test

CHAPTER FOUR: ANALYSIS AND DISCUSSION

4.0       AERIAL/ANTENNA

4.0.1    TRANSMITTING AERIAL

4.0.2    OPERATIONAL PRINCIPLE OF THE ANTENNA

4.1       RECEPTION

4.2       PRECAUTION

4.3       PACKAGING

4.4      CHALLENGES OR SHORTCOMINGS

4.4       CONCLUSION

4.5       RECOMMENDATION

REFERENECES