FM TRANSMITTER
B.E. ELECTRONIC CIRCUIT DESIGN
Ready By
Muhammad Hassan 9341
Nabeel Iqbal
Mission Advisor
Sir Zeeshan Nazar
School of Engineering
PAF-Karachi Institude of Financial And Know-how
Karachi
ABSTRACT
A fm transismitter is a circuit which developed frequency modulated sign utilizing transistor. This circuit is mainly a radio system which Help with antenna and enhance the electromagnetic sign. In fm transmission they primarily based on frequency vary of 88MHz to 108MHz.When the enter audio sign is utilized to the transistor and the output sign is modulate and set the resonant frequency.
Once we set the resonant frequency we modify the capacitance worth. After set the resonant worth we connect with oscillator.
TABLE OF CONTENTS
Summary .iTable Of Contents .iiList oF Figures .iiiCHAPTER ONE
INTRODUCTION …1
CHAPTER TWO
LITERATURE REVIEW …1
CHAPTER THREE
Technique And Materials 1-1.four
Battery ………1.1
Mic ..1.1
Resistor …1.2
Capacitor ……..1.2
Inductor …1.three
Trimmer capacitor .. 1.three
Transistor 1.four
Calculation .1.four
CHAPTER FOUR
Block Diagram ……..2
Schematic Diagram .2
CHAPTER 5
Conclusion .three
LIST OF FIGUREFig.1 Battery 1.1
Fig.2 Mic ..1.1
Fig. three Resistor ..1.2
Fig.four Capacitor 1.2
Fig.5 Inductor ..1.three
Fig.6 Trimmer Capacitor .1.three
Fig.7 Transistor ….1.four
Fig.eight Block Diagram .2
Fig.9 Schematic Diagram ..three
CHAPTER 1
INTRODUCTION
The FM transmitter is a sign transistor circuit. Within the telecommunication the frequency modulation (FM) switch the knowledge of various frequency of service wave in line with message sign. Principally FM transmitter used VHF radio frequencies of 87.5 MHz to 108 MHz to transmit and obtain the FM sign.
CHAPTER 2
LITERATURE REVIEW
It had been exceed to want info over an extended distance. In, over time totally different try had been made and to not justify this want, however to complete it ease. In starting of human historical past the wired phone within the eighteen forte (1840) and a few decade later on the drawn of 21st century and the used of radio wave is the wi-fi communication system. In different factor, it allow the human voice for lengthy distance utilizing with service wave at a modulated frequency of 87.5MHz-108MHz and acquired on an acceptable FM receiver.
CHAPTER three
METHOD AND MATERIAL
Within the ciruit (fig 1) exhibits that the FM transmitter circuit and used and digital elements on this circuit.
1: Battery (9v) 2: Mic
three: Resistor four: Capacitor
5: Inductor 6: Trimmer Capacitor
7: Transistor eight: Antenna
To think about the microphone is to grasp the indicators which contained in the mic and there’s a presence of capacitive sensor. Its produce when the vibration is produce for air stress and Ac sign. The formation of the oscillating tank circuit is finished by the transistor of 2N3904 through the use of inductor and variable capacitor. The transistor which is used within the circuit is an NPN transistor and usually used for amplification objective. If the present is handed on the inductor L1 and variable capacitor then the tank circuit will oscillate on the resonant service frequency of the fm modulation.
1: BATTERY
In our circuit is used for energy provider.
Determine 1
2: MIC
A tool which convert vitality from one to a different.
Determine 2
three: RESISTOR
Resistor is a resistive objective. Its mainly used for all circuit. In our circuit we additionally used for resistive objective.
Determine three
four: CAPACITOR
Capacitor is used for storing cost in type of subject, separated by an insulator. In different phrase we describe the capacitor as a part which has capability to retailer vitality in type of electrical cost.
Determine four
5: INDUCTOR
A inductor which retailer electrical vitality in to magnetic vitality. When electrical energy passes the coil from left to proper its will generate a magnetic subject within the type of clock route.
Determine 5
6: TRIMMER CAPACITOR
It additionally known as a variable capacitor.It has a facility to transform capacitance worth, however often as soon as variation is suffiently.
Determine 6
TRANSISTOR
A transistor is a digital part which work two totally different jobs which is Amplification and switching. In our circuit we used transistor as amplification.
Determine 7
CALCULATION
STEP 1
FORMULA
F=1/ 2*pi*root*(l*c)
STEP 2
L=zero.1uH
C=25pf
Pi=three.142
F=100MHz
CHAPTER four
BLOCK DIAGRAM
To
ANTENNA
Modulator
Microphone
Audio Per-
Amplifier
ANTEENA
Oscillator
RE-Amplifier
Determine eight
MICRO PHONE
Its a sort of transduce which convert vitality from one to a different. Its convert sound wave in to audio sign.
AUDIO PRE-AMPLIFIER
In audio pre amplifier the weak sign of enter in to output sign and powerful from noise and tolerance and in addition sturdy for additional processing ,after which sending to microphone, with out doing this its make distorting.
MODULATOR
To incorporate voice info if anoter wave is have to be imposed known as enter sign, on the highest of service wave. This strategy of imposing is for enter sign in to service wave is named modulator.
OSCILLATOR
An oscillating digital sign its produce a sine wave and sq. wave.It covert direct present (Dc) for energy provide to alternate present (Ac) sign.
RF-AMPLIFIER
A radio frequency amplifier is barely amplifying sign which is used to extend the amplitude. It additionally used as a receiver to amplify the sign and allow receiver to work.
ANTEENA
The radio wave which is passes via air at a velocity of sunshine. A antenna produce electrical present to recreate the unique sign.
SIMULATION CIRCUIT
Determine 9
CHAPTER 5
CONCLUSION
On this undertaking we have now seen operation of our lesson, which is fm modulation, oscillator, transmission and wi-fi communication and extra. If sign modulation voltage is (0V) the service frequency stay fixed which depent on transmission frequency and if sign voltage is will increase the service frequency additionally enhance the sign attain to +ve peak and service frequency is most. If the sign voltage is decreases the service frequency additionally lower and the sign attain to zero peak and service frequency is minimal.