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PREFACE
Project is important in the curriculum of engineering students. Its successful is very important.
The study remains incomplete without the practical knowledge. Theoretical knowledge is not sufficient so one requires practical knowledge too. It is rather important for every student to undertake a project.
These days in the competitive age having a different perspective providing a
leading edge .Electronics projects provides insight to students about the way the
work is done in industries. It helps in systematically aligning students with the work
culture of the practical area.
ACKNOWLEDGEMENT
Theoretical knowledge is never sufficient. What one learns, that has to be practically implemented. During these days, I have got to learn a lot practically, which otherwise would not have been possible. I took this opportunity to thank everybody, who have helped me in some or the other way in this task.
First of all I would like to thank my institution MJRP COLLEGE OF ENGINEERING & TECHNOLOGY (JAIPUR).
Next I would like to thank Ms. Jyoti Rawat and Ms. Kiran Rawat. For giving me a chance to work on this project. Working in such an organizations enhances several other skills along with the technical knowledge.
Most of all I am thankful to MR. VIPIN CHOUHAN (HOD, Electronics and comm.) who supported me a lot during project.
We would also like to thank many individuals who helped us directly or indirectly for spending their valuable time and giving me their guidance and insightful suggestion at all stages of our projects.
Last but not the least I thank all my friends who directly or indirectly helped me during this term.
ABSTRACT
This report presents the design, implementation, and testing of a MOBILE SIGNAL DETECTOR & CELL PHONE JAMMER. This device works for GSM 900 mobile phones. This project will go through two phases:
PHASE ONE: In first phase of our project we decided to device the moile signal detection device that can detect the radio frequency moile signals of GSM 900 band. This device will work when it detects any mobile phone signal and act as an input to our second phase so that it can start jamming the mobile signals.
PHASE TWO: On completion of the first phase we will start working on it and will be establishing the system design and selecting suitable components and building the basic PCB layout design to implement the basic circuit functioning and mount the noise generator coil on the circuit in order to generate the noise signal so it could be amplified and transmitted to jam the required frequency band i.e. GSM 900 band.
LIST OF FIGURES
S.No. / FIG. No. / FIGURE NAME / PAGE No.1. / 1.1 / CIRCUIT DIAGRAM OF MOBILE DETECTOR / 3
2. / 4.1 / INTERNAL BLOCK DIAAGRAM OF NE555 / 7
3. / 4.2 / CIRCUIT OF TIMER 555 AS MONOSTABLE MULTIVIBRATOR / 9
4. / 4.3 / TIMER OUTPUT WAVEFORMS / 10
5. / 4.4 / TIMER OUTPUT OF ASTABLE MULTIVIBRATOR / 11
6. / 4.5 / VIEW OF CA3130 / 13
7. / 4.6 / TRANSISTOR / 14
8. / 4.7 / SYMBOL OF TRANSISTOR / 14
9. / 4.8 / AMPLIFIER CIRCUIT / 15
10. / 4.9 / SYMBOL OF LED / 16
11. / 4.10 / CAPACITORS / 18
12. / 4.11 / CERAMIC CAPACITOR / 18
13. / 4.12 / ELECTROLYTE CAPACITORS / 19
14. / 4.13 / RESISTOR / 20
15. / 4.14 / BUZZER / 21
S.No. / FIG. No. / FIGURE NAME / Page No.
16. / 4.15 / PCB LAYOUT / 23
TABLE OF CONTENTS
INTRODUCTION TO PHASE ONE
S. No. / CONTENTS / PAGE No.1.
2.
3.
4. / INTRODUCTION……………………………………
1.1 METHODOLOGY
WORKING......
LIST OF COMPONENTS…………………………...
COMPONENTS DESCRIPTION
4.1 NE555
4.1.1 FEATURES
4.1.2 APPLICATIONS
4.1.3 WORKING
4.2 IC CA3130
4.2.1 FEATURES
4.2.2 APPLICATIONS
4.3 TRANSISTOR-BC548
4..1 TRANSISTOR AS AN AMPLIFIER
4.4 LIGHT EMITTING DIODE
4.5 CAPACITORS
4.5.1 LIST OF CAPACITORS USED
4.5.2 TYPES OF CAPACITORS USED
4.6 RESISTORS
4.7 SWITCH
4.8 BUZZEA
4.9 POWER SUPPLY
4.10 PCB / 1-2
2
4-5
6
7-23
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8
8
8
11
12
12
14
15
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18
20
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INTRODUCTION TO SECOND PHASE
S. No. / CONTENTS / PAGE No.5.
6.
7.
8. / MOBILE JAMMER…………………………………
5.1 DESCRIPTION
5.2 MOBILE JAMMING TECHNIQUE
5.2.1 TYPE “A” DEVICE
5.2.2 TYPE “B” DEVICE
5.2.3 TYPE “C” DEVICE
5.2.4 TYPE “D” DEVICE
5.2.5 TYPE “E” DEVICE
OUR DEVICE………………………………………...
CNCLUSION………………………………………….
REFERENCES………………………………………… / 24-28
24
26-28
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INTRODUCTION TO PHASE ONE
INTRODUCTION
The Mobile detection project is an advanced device which finds various applications in the modern fields of communication and surveillances. Mobile detection project is designed to detect the mobile phone in a closed room / place which is in active transmission mode. This project is very useful for the private meetings, defense establishment, military camp, Hospitals, petrol pumps etc., where the uses of an active Mobile Communication (GSM) device are prohibited. With the aid of the project, one can detect the active mobile device like Cell Phone and GPS systems. Here the mobile detection project can be used like a metal detector and the project is capable of detecting the Cell Phone like device from the range of few centimeters to few inches depending upon the cell phone’s transmission strength and other parameters. Here the project is waved near the person / place where the presence of a GSM is banned. Further, the project also incorporates a very unique feature of remote paging & indication. In this part when the project is installed on the frame of a door or entrance, (like metal detectors) it scan incoming person’s mobile activity and if the person is carrying an “Active” mobile phone, then instead of activating an alarm, it sends a wireless message using Infra-Red signal to a microcontroller unit which ic monitored by a person. So whenever the project detects the active phone carried by a person, it can be made to display an alert message about the same to watchman security personnel silently.
1.1METHODOLOGY:
Here the project consists of a set of high sensitive electronic wave detection antenna, preamplifier, filter, Schmitt trigger, switching stage an alarm. The project is exactly same as that of a metal detector in principle and operation. The project is also similar to operation and detection like the Metal / Explosive detector, only with a difference being that, the Metal / Explosive detector is going to detect the passive parameters, but whereas the project is aimed to detect the active signals like GSM signal source like mobile phone which operates in the frequency band of 900 MHz or 1800 MHz typically.
Fig 1.1 CIRCUIT DIAGRAM OF MOBILE DETECTOR
WORKING
This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one and-a-half meters. So it can be used to prevent use of mobile phones in examination halls, confidential rooms, etc. It is also useful for detecting the use of mobile phone for spying and unauthorized video transmission. The circuit can detect the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode. The moments the bug detects RF transmission signal from an activated mobile phone, it starts sending a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. An ordinary RF detector using tuned LC circuits is not suitable for detecting signals in the GHz frequency band used in mobile phones. The transmission frequency of mobile phones ranges from 0.9 to 3 GHz with a wavelength of 3.3 to 10 cm. Fig. 1.1 shows the working of mobile detector so a circuit detecting GHz signals is required for a mobile bug. Here the circuit uses a 0.22µF disk capacitor (C3) to capture the RF signals from the mobile phone. The lead length of the capacitor is fixed as 18mm with a spacing of 8mm between the leads to get the desired frequency. The disk capacitor along with the leads acts as a small GHz. Loop antenna to collect the RF signals from the mobile phone Op-amp IC CA3130(IC1) is used in the circuit as a current-to-voltage converter with capacitor C3 connected between its inverting and non-inverting inputs. It is a CMOS version using gate-protected P-channel MOSFET transistors in the input to provide very high input impedance, very low input current and very high speed of performance. The output CMOS transistor is capable of swinging the output voltage to within 10mV of either supply voltage terminal. Capacitor C3 in conjunction with the lead inductance acts as a transmission line that intercepts the signals from the mobile phone. This capacitor creates a field, stores energy and transfers the stored energy in the form of minute current to the inputs of IC1. This will upset the balanced input of IC1 and convert the current into the corresponding output voltage. Capacitor C4 along with high-value resistor R1 keeps the non-inverting input stable for easy swing of the output to high state. Resistor R2 provides discharge path for capacitors C4. feedback resistor R3 makes the inverting input high when the output becomes high. Capacitor C5 (47pF) is connected across ‘strobe’ (Pin 8) an ‘null’ inputs (pin 1) of IC1 for phase compensation and gain control to optimize the frequency response. When the mobile phone signal is detected by C3, the output of IC1 becomes high and low alternately according to the frequency of the signal as indicated by LED1. This triggers monostable timer IC2 through capacitor C7. Capacitor C6 maintains the base bias of transistor T1 for fast switching action. The low-value timing components R6 and C9 produce very short time delay to avoid audio nuisance. Assemble the circuit on a general purpose PCB as compact as possible and enclose in a small box like junk mobile case. As mentioned earlier, capacitor C3 should have a lead length of 18mm with lead spacing of 8mm. Carefully solder the capacitor in standing position with equal spacing of the leads. The response can be optimized by trimming the lead length of C3 for the desired frequency. You may use a short telescopic type antenna. Use the miniature 12V battery of a remote control and a small buzzer to make the gadget pocket-size. The unit will give the warning indication if someone uses mobile phone within a radius of 2 feet.
LIST OF COMPONENTS
1. IC-CA3130
2. IC-NE555
3. Transistor-BC548
4. LED
5. Capacitor
6. Resistor
7. Switch
8. Buzzer
9. 9V Power supply
10. PCB
COMPONENT DESCRIPTION
4.1 NE555:
The LM555/NE555/SA555 is a highly stable controller capable of produce accurate timing pulses. With monostable operation, the time delay is controlled by one external resistor and one capacitor. With astable operation, the frequency and duty cycle are accurately controlled with two external resistors and one capacitor.
4.1.1 Features:
· High Current Drive Capability (200mA)
· Adjustable Duty Cycle
· Temperature stability of 0.005%ºc
· Timing from Sec to Hours
· Turn off Time Less than 2Sec
4.1.2 Applications:
· Precision Time
· Pulse Generation
· Time Delay Generation
· Sequential Timing
4.1.3 WORKING:
1. MONOSTABLE OPERATION:
In this mode, the timer generates a fixed pulse whenever the trigger voltage falls below vcc/3.When the trigger pulse voltage applied to the #2 pins falls below Vcc/3 while the timer output is low, the timer’s internal flip-flop turns the discharging Tr. Off and causes the timer output to become high by charging the external capacitor C1 and setting the flip-flop output at the same time. The voltage across the external capacitor C1, VC1 increases exponentially with the time constant t=RA*C and reaches 2Vcc/3 and td=1.1RA*C. Hence capacitor C1 is charged through resistor RA. The greater the time constant RAC controls the output pulse width. When the applied voltage to the capacitor C1 reaches 2Vcc/3, the comparator on the trigger terminal resets the flip-flops, turning the discharging Tr. On. At this time, C1 begins to discharge and the timer output converts to low.
In this way, the timer operating in monostable repeats the above process. Fig 4.3 shows the time constant relationship based on RA and C. Fig 4.3 shows the general waveforms during monostable operation.
It must be noted that, for normal operation, the trigger pulse voltage needs to maintain a minimum of Vcc/3 before the timer output turns low. That is, although the output remains unaffected even if a different trigger pulse is applied while the output is high, it may be affected and the waveform not operate properly f the trigger pulse voltage at the end of the output pulse remains at below Vcc/3. Fig 4.3 shows such timer output abnormality.
2. ASTABLE OPERATION:
An astable timer operation is achieved by adding resistor RB and configuring it. In astable operation, the trigger terminal and the threshold terminal are connected so that a self-trigger is formed, operating as a multi vibrator. When the timer output is high, its internal discharging Tr. Turn off and the VC1 increases by exponential function with the time constant (RA+RB)*C.