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Nov 19th, 2019

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FM TRANSMITTER

B.E. ELECTRONIC CIRCUIT DESIGN

Prepared By

Muhammad Hassan 9341

Nabeel Iqbal

Project Advisor

Sir Zeeshan Nazar

College of Engineering

PAF-Karachi Institude of Economic And Technology

Karachi

ABSTRACT

A fm transismitter is a circumference which plain abundance modulated important using transistor. This circumference is basically a radio order which aid after a while antenna and acception the electromagnetic important. In fm transmission they established on abundance class of 88MHz to 108MHz.When the input audio important is applied to the transistor and the output important is modulate and set the shrill abundance.

When we set the shrill abundance we fluctuate the capacitance appreciate. After set the shrill appreciate we integrate to oscillator.

TABLE OF CONTENTS

Abstract………………………………………………………………….iTable Of Contents……………………………………………………….iiList oF Figures………………………………………………………….iiiCHAPTER ONE

INTRODUCTION………………………………………………………1

CHAPTER TWO

LITERATURE REVIEW………………………………………………1

CHAPTER THREE

Method And Material………………………………………………1-1.4

Battery…………………………………………………………………1.1

Mic…………………………………………………………………..1.1

Resistor………………………………………………………………1.2

Capacitor ……………………………………………………………..1.2

Inductor………………………………………………………………1.3

Trimmer capacitor………………………………………………….. 1.3

Transistor……………………………………………………………1.4

Calculation………………………………………………………………….1.4

CHAPTER FOUR

Block Diagram………………………………………………………..2

Schematic Diagram………………………………………………….2

CHAPTER 5

Conclusion………………………………………………………….3

LIST OF FIGUREFig.1 Battery………………………………………………………1.1

Fig.2 Mic…………………………………………………………..1.1

Fig. 3 Resistor……………………………………………………..1.2

Fig.4 Capacitor……………………………………………………1.2

Fig.5 Inductor……………………………………………………..1.3

Fig.6 Trimmer Capacitor………………………………………….1.3

Fig.7 Transistor…………………………………………………….1.4

Fig.8 Block Diagram……………………………………………….2

Fig.9 Schematic Diagram…………………………………………..3

CHAPTER 1

INTRODUCTION

The FM impelter is a important transistor circumference. In the telemessage the abundance harmonization (FM) exchange the advice of contrariant abundance of consigner thrive according to missive important. Mostly FM impelter used VHF radio frequencies of 87.5 MHz to 108 MHz to impel and take the FM important.

CHAPTER 2

LITERATURE REVIEW

It had been excel to insufficiency advice balance a covet space. In, balance era contrariant violate had been made and not to defend this insufficiency, but to conclude it satisfaction. In source of anthropological narrative the wired telephone in the eighteen forte (1840) and some decade posterior at the drawn of 21st senility and the used of radio thrive is the wireless message order. In other romance, it emrule the anthropological suffrage for covet space using after a while consigner thrive at a modulated abundance of 87.5MHz-108MHz and taked on a befitting FM taker.

CHAPTER 3

METHOD AND MATERIAL

In the ciruit (fig 1) shows that the FM impelter circumference and used of electrical and electronic elements in this circumference.

1: Battery (9v) 2: Mic

3: Resistor 4: Capacitor

5: Inductor 6: Trimmer Capacitor

7: Transistor 8: Antenna

To weigh the microphone is to discern the importants which internally the mic and there is a influence of capacitive sensor. Its profit when the urge is profit for air urgency and Ac important. The shape of the superficial tank circumference is done by the transistor of 2N3904 by using inductor and urgering capacitor. The transistor which is used in the circumference is an NPN transistor and generally used for comment scope. If the exoteric is passed at the inductor L1 and urgering capacitor then the tank circumference conciliate convulse at the shrill consigner abundance of the fm harmonization.

1: BATTERY

In our circumference is used for rule supplier.

Figure 1

2: MIC

A contrivance which apply activity from one to another.

Figure 2

3: RESISTOR

Resistor is a resistive scope. It’s basically used for all circumference. In our circumference we to-boot used for resistive scope.

Figure 3

4: CAPACITOR

Capacitor is used for storing commit in fashion of room, divided by an insulator. In other message we represent the capacitor as a element which has jurisdiction to ammunition activity in fashion of electrical commit.

Figure 4

5: INDUCTOR

A inductor which ammunition electrical activity in to magnetic activity. When electricity passes the implication from left to fit its conciliate result a magnetic room in the fashion of clock order.

Figure 5

6: TRIMMER CAPACITOR

It to-boot determined a urgering capacitor.It has a ease to apply capacitance appreciate, but firmly unintermittently exception is suffiently.

Figure 6

TRANSISTOR

A transistor is a electronic element which performance two contrariant jobs which is Comment and switching. In our circumference we used transistor as comment.

Figure 7

CALCULATION

STEP 1

FORMULA

F=1/ 2*pi*root*(l*c)

STEP 2

L=0.1uH

C=25pf

Pi=3.142

F=100MHz

CHAPTER 4

BLOCK DIAGRAM

To

ANTENNA

Modulator

Microphone

Audio Per-

Amplifier

ANTEENA

Oscillator

RE-Amplifier

Figure 8

MICRO PHONE

It’s a mold of transduce which apply activity from one to another. Its apply investigate thrive in to audio important.

AUDIO PRE-AMPLIFIER

In audio pre amplifier the malleable important of input in to output important and zealous from tumult and tolerance and to-boot zealous for raise ordering ,and then sending to microphone, after a whileout doing this its result distorting.

MODULATOR

To understand suffrage advice if anoter thrive is insufficiency to be imposed determined input important, on the top of consigner thrive. This order of striking is for input important in to consigner thrive is determined modulator.

OSCILLATOR

An superficial electronic important its profit a sine thrive and balance thrive.It implied straightforward exoteric (Dc) for rule afford to be-undetermined exoteric (Ac) important.

RF-AMPLIFIER

A radio abundance amplifier is merely developing important which is used to acception the abundance. It to-boot used as a taker to develop the important and emrule taker to performance.

ANTEENA

The radio thrive which is passes through air at a urge of active. A antenna profit electric exoteric to relent the primordial important.

SIMULATION CIRCUIT

Figure 9

CHAPTER 5

CONCLUSION

In this design we keep seen performance of our warning, which is fm harmonization, oscillator, transmission and wireless message and further. If important harmonization voltage is (0V) the consigner abundance continue firm which depent on transmission abundance and if important voltage is acceptions the consigner abundance to-boot acception the important thrust to +ve peak and consigner abundance is apex. If the important voltage is subsides the consigner abundance to-boot decrsatisfaction and the important thrust to 0 peak and consigner abundance is poverty.

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