This project presentation summarizes a mobile detector circuit designed to detect unauthorized mobile phone usage. The circuit uses a 0.22uF disk capacitor to capture radio frequency signals from nearby mobile phones. An operational amplifier converts the captured signal to a corresponding output voltage. When a phone signal is detected, the output triggers a timer chip that activates a buzzer for alarm. The device can detect calls, SMS, and video transmission from phones within 5 meters. It is intended to prevent phone use in restricted areas like exam halls. The summary provides an overview of the device's purpose, design, and applications in 3 sentences.
DESIGN & WORKING OF A MOBILE PHONE DETECTORpgayatrinaidu
This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellphone from a distance of one and-a-half metres. 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 unauthorised video transmission.
The circuit can detect both the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode. The moment the bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases.
This handy, it can be used to prevent use of mobile phones in examination halls, confidential rooms and, etc. It is also useful for detecting the use of mobile phone for Spying and unauthorized video transmission. The circuit can detect the incoming calls pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters. So and also outgoing calls, SMS and video transmissions even if the mobile phone is kept in the silent mode. The moment the Bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. The capacitor C3 should have a lead length of 18 mm with lead spacing of 8 mm. we have to 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. We are using a short telescopic type antenna. The unit will give the warning indication if someone uses Mobile phone within a radius of 1.5 meters.
We provide you Project Cell Phone Detector.You can choose the best of your choice and interest from the list of topics we suggested. All new project ideas that are appearing focuses to improve the knowledge of Engineering students.
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Visit our page to get more ideas on Project Report Format for Final Year Engineering Students these ideas developed by professionals.
Elprocus provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
This ppt explains mainly on scope of project is to sense the presence of an activated mobile phone from a distance of one-and-a-half meters to prevent the use of same in the examination halls with cell phone detector circuit diagram.
Edgefxkits.com has a wide range of electronic projects ideas that are primarily helpful for ECE, EEE and EIE students and the ideas can be applied for real life purposes as well.
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Visit our page to get more ideas on popular electronic projects developed by professionals.
Edgefx provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
DESIGN & WORKING OF A MOBILE PHONE DETECTORpgayatrinaidu
This handy mobile bug or cell phone detector, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cellphone from a distance of one and-a-half metres. 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 unauthorised video transmission.
The circuit can detect both the incoming and outgoing calls, SMS and video transmission even if the mobile phone is kept in the silent mode. The moment the bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases.
This handy, it can be used to prevent use of mobile phones in examination halls, confidential rooms and, etc. It is also useful for detecting the use of mobile phone for Spying and unauthorized video transmission. The circuit can detect the incoming calls pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters. So and also outgoing calls, SMS and video transmissions even if the mobile phone is kept in the silent mode. The moment the Bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. The capacitor C3 should have a lead length of 18 mm with lead spacing of 8 mm. we have to 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. We are using a short telescopic type antenna. The unit will give the warning indication if someone uses Mobile phone within a radius of 1.5 meters.
We provide you Project Cell Phone Detector.You can choose the best of your choice and interest from the list of topics we suggested. All new project ideas that are appearing focuses to improve the knowledge of Engineering students.
https://www.elprocus.com
Visit our page to get more ideas on Project Report Format for Final Year Engineering Students these ideas developed by professionals.
Elprocus provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
This ppt explains mainly on scope of project is to sense the presence of an activated mobile phone from a distance of one-and-a-half meters to prevent the use of same in the examination halls with cell phone detector circuit diagram.
Edgefxkits.com has a wide range of electronic projects ideas that are primarily helpful for ECE, EEE and EIE students and the ideas can be applied for real life purposes as well.
http://www.edgefxkits.com/
Visit our page to get more ideas on popular electronic projects developed by professionals.
Edgefx provides free verified electronic projects kits around the world with abstracts, circuit diagrams, and free electronic software. We provide guidance manual for Do It Yourself Kits (DIY) with the modules at best price along with free shipping.
MOBILE BUG ; ACTIVE CELL PHONE DETECTOR USING CMOS & BIPOLAR TRANSISTORSShahrukh Javed
DESCRIPTION
Cell Phone Detector this handy, pocket-size mobile transmission detector can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters.
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 moment the Bug detects RF (radio frequency transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. This project provides a simple circuit to detect the presence of an activated cell phone by detecting these signals.
NOTE Circuit will not detect if the mobile is switched off.
TEAM MEMBER
SHAHRUKH JAVED
SYED MOULA
For more log on to: http://shahrukhjaved.webs.com/apps/blog/
E-mial: shahrukh.tjit14@gmail.com
What it is: This is a circuit for a mobile transmission detector which can detect use of a mobile phone within the range of 1.5 meters. Whenever usage of mobile phone is detected such as calling or texting a beep alarm starts sounding and a led blinks.
Why it is: 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.
Where it is used: 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.
A cell phone detector is a device which detects any cell phone at any examination hall,meetings and any other place whenever required. This is a very useful device in modern time whenever unwanted activities are growing due to cell phone. In this presentation we covered principle,components, working and assembling of all components including advantages of this device.
@ Mr. unique presentations
Cell phones are widely used in the world. While people have to be connected to one another, there are situations or places where their usage is to be prohibited either due to security reasons or it may cause health hazards.
Here is the presentation on Cell Phone Detectors which are widely used in sensitive places to monitor things. The project basically consists of a battery, speaker & LED( for output), sensors and amplifiers. The presentation talks about the most simple Cell phone detector which anyone can make or purchase for few bucks.
Hope this will help
This handy, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell 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 moment the Bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. 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 18 mm with lead spacing of 8 mm. 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.
This presentation consisting of home automation using bluetooth controol on the basis of Arduino UNO. Arduino is a rapid proto type , that's why we are using this arduino board. This Arduino UNO consisting of a microcontroller namely ATMEGA328. It has both analog and digital I/O pins inorder to communicate with the external peripherals.
Mobile jammer is a device which interferes the cell phone signals. Learn the working of a cell phone jammer, different types of jammers and its applications
For more details: https://goo.gl/DU59CB
Home Automation Using Arduino Uno and HC-05Vidhi Shah
Controlling the DC motor (as fan) and Light bulb through HC-05 bluetooth module using the bluetooth terminal app from available on play store. The report attached herewith have a detailed description of the Circuit and the code. Interested ones can do further editings also:)
MOBILE BUG ; ACTIVE CELL PHONE DETECTOR USING CMOS & BIPOLAR TRANSISTORSShahrukh Javed
DESCRIPTION
Cell Phone Detector this handy, pocket-size mobile transmission detector can sense the presence of an activated mobile cell phone from a distance of one and-a-half meters.
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 moment the Bug detects RF (radio frequency transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. This project provides a simple circuit to detect the presence of an activated cell phone by detecting these signals.
NOTE Circuit will not detect if the mobile is switched off.
TEAM MEMBER
SHAHRUKH JAVED
SYED MOULA
For more log on to: http://shahrukhjaved.webs.com/apps/blog/
E-mial: shahrukh.tjit14@gmail.com
What it is: This is a circuit for a mobile transmission detector which can detect use of a mobile phone within the range of 1.5 meters. Whenever usage of mobile phone is detected such as calling or texting a beep alarm starts sounding and a led blinks.
Why it is: 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.
Where it is used: 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.
A cell phone detector is a device which detects any cell phone at any examination hall,meetings and any other place whenever required. This is a very useful device in modern time whenever unwanted activities are growing due to cell phone. In this presentation we covered principle,components, working and assembling of all components including advantages of this device.
@ Mr. unique presentations
Cell phones are widely used in the world. While people have to be connected to one another, there are situations or places where their usage is to be prohibited either due to security reasons or it may cause health hazards.
Here is the presentation on Cell Phone Detectors which are widely used in sensitive places to monitor things. The project basically consists of a battery, speaker & LED( for output), sensors and amplifiers. The presentation talks about the most simple Cell phone detector which anyone can make or purchase for few bucks.
Hope this will help
This handy, pocket-size mobile transmission detector or sniffer can sense the presence of an activated mobile cell 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 moment the Bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks. The alarm continues until the signal transmission ceases. 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 18 mm with lead spacing of 8 mm. 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.
This presentation consisting of home automation using bluetooth controol on the basis of Arduino UNO. Arduino is a rapid proto type , that's why we are using this arduino board. This Arduino UNO consisting of a microcontroller namely ATMEGA328. It has both analog and digital I/O pins inorder to communicate with the external peripherals.
Mobile jammer is a device which interferes the cell phone signals. Learn the working of a cell phone jammer, different types of jammers and its applications
For more details: https://goo.gl/DU59CB
Home Automation Using Arduino Uno and HC-05Vidhi Shah
Controlling the DC motor (as fan) and Light bulb through HC-05 bluetooth module using the bluetooth terminal app from available on play store. The report attached herewith have a detailed description of the Circuit and the code. Interested ones can do further editings also:)
Literature Review (Review of Related Literature - Research Methodology)Dilip Barad
Literature Review or Review of Related Literature is one of the most vital stages in any research. This presentation attempts to throw some light on the process and important aspects of literature review.
10 Ways Your Boss Kills Employee MotivationOfficevibe
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Smart Autonomous Mobile detector RobotPunit Tiwari
SMART AUTONOMOUS MOBILE DETECTOR ROBOT
-This device can notice the use of GSM mobile phone in mobile restricted areas such as Examination hall or confidential rooms etc.
-It is just like a sniffer mobile that can sense the activity of mobile phone from a distance of 5 meters or more.
Smart Autonomous Mobile detector RobotPunit Tiwari
SMART AUTONOMOUS MOBILE DETECTOR ROBOT
-This device can notice the use of GSM mobile phone in mobile restricted areas such as Examination hall or confidential rooms etc..
-It is just like a sniffer mobile that can sense the activity of mobile phone from a distance of 5 meters or more.
CASCADEMIC Smart Water Meter Solution is a compact low power Industrial grade device that has the features to work under a networked environment.
The Smart flow meter has inbuilt Processing, storage and RF transmission unit.
The Smart water meter is an automated meter reading (AMR) based water meter with long life battery operation which is integrated and can be completely sealed based on the application requirement.
The modular approach design of this device provides the OEM’s the flexibility to use any type of sensors that match their application environment. For the current remote flow meter application,we can use ultrasonic sensor, AMR sensor or Hall Effect Sensor.
Small, widely available and dirt-cheap ultrasonic sensors enable us to design both simple and lavish measuring devices for all kinds of ranging. Take one of these modules, add a display, a couple of press-buttons and a micro-controller loaded with software, and you now have all the ingredients for a circuit of this kind.
Power Line Carrier Communication (PLCC) is a communication method that uses electrical wiring to simultaneously carry both data and electric power. This makes power line communication one of the best means for networking. It is also known as power line carrier, power line digital subscriber line (PDSL), mains communication, power line telecommunications, or power line networking (PLN).
Wirelessmobilechargingthroughmicrowaves2 r aviRavi Kumar
WIRELESS CHARGING
INTRODUCTION Always the recharging of mobile phone batteries has always been a problem for us. This problem will be solved after our proposal………!!!!!!!! In this paper a new proposal has been made so as to make the recharging of the mobile phones is done automatically as you talk in your mobile phone!
3. The microwave signal is transmitted from the transmitter along with the message signal using special kind of antennas called slotted wave guide antenna at a frequency is 2.45 GHz Thus the more you talk, the more is your mobile phone charged!!!!!!! This is new isn’t?!!
4. What Is Microwaves????? Microwaves are good for transmitting information from one place to another because microwave energy can penetrate haze, light rain and snow, clouds, and smoke. Shorter microwaves are used in remote sensing. These microwaves are used for radar like the Doppler radar used in weather forecasts
5. Microwaves > Frequency Range: 3GHZ to 300GHZ > Remort Sensing. > Communication Industry. >2.45GHZ ISM Band.
6. TRANSMITTER DESIGN The MAGNETRON is a self-contained microwave oscillator that operates differently from the linearbeam tubes, such as the TWT and the klystron. ——Magnetron is used to produce high-power output required in radar and communications equipment —Microwaves used in mobile communication are also produced by similar Oscillators
7. Magnetron - Construction
8. PRINCIPLE OF OPERATION
9. WHAT’S RECTANNAE??? What’s rectannae you are confused…….it’s nothing but the combination of rectifier and antenna. Antenna is to receive the microwave signal and it just feed the signal to rectifier . Rectifier is to convert the AC signal to PULSATING DC signal.
10. RECEIVER DESIGN The basic addition to the mobile phone is going to be the rectenna. A rectenna is a rectifying antenna, a special type of antenna that is used to directly convert microwave energy into DC electricity.
11. ADVANTAGES Use of separate chargers is eliminated. Electricity is saved The phone can be charged anywhere anytime. Wireless energy transfer can potentially recharge the mobile phones without chords. Only one microwave transmitter can serve to all the service providers in that area. The need of different types of chargers by different manufacturers is totally eliminated.
12. DISADVANTAGES The transmitter and receiver also should be very powerful devices as the distance increases. Slower Charging. Wireless transmission of the energy causes some drastic effects to human body, because of its radiation. More costly.
BSNL Internship presentation for Electrical and ElectronicsGhufran Ahmed
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Mobile detector grp9
1. Project Presentation on
MOBILE DETECTOR
By
PRABHAKAR NATH
RASHID SHEIKH
RAVIKANT KASHYAP
SAYYED JAVED ZAFFER
Roll..No 14,26,28,38
Under the guidance of
Mr. MAHEEDHAR DUBEY
ASSISTANT PROFESSOR
Department of Electronics & Telecommunication Engineering
Chhatrapati Shivaji Institute of Technology, Durg
2. CONTENTS
• Introduction
•Description Of Mobile Detector
•Components List
•Working Of Mobile Bug
•How The Circuit Works
•Pin Configuration Of IC CA3130
•Features & Applications Of IC CA3130
•Features & Applications Of IC 555 TIMER
•Application & Limitation Of Mobile Detector
•Conclusion
2
3. INTRODUCTION
MOBILE DETECTOR
•This device can notice the use of GSM mobile phone in mobile restricted
areas such as Examination hall or confidential rooms etc.
•It is just like a sniffer mobile that can sense the activity of mobile phone
from a distance of 5 meters or more.
•The device can detect both incoming and outgoing calls, SMS and video
transmission even if the mobile phone is kept in the silent mode.
• The Aim of this circuit is to receive the RF signal from the mobile
phones & detect its presence by alarming the sound.
3
4. DESCRIPTION
•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. So a
circuit detecting gigahertz signals is required for a mobile bug.
•Here the circuit uses a 0.22uf disk capacitor (C3) to capture the RF
signals from the mobile phone. The lead length of the capacitor is fixed
as 18 mm with a spacing of 8 mm between the leads to get the desired
frequency. The disk capacitor along with the leads acts as a small
gigahertz loop antenna to collect the RF signals from the mobile phone.
4
7. •IC CA3130
•IC NE555
•T1 BC548
•LED
•ANTENNA
•PIEZO BUZZER
•5 INCH LONG ANTENNA
•ON/OFF SWITCH
7
•POWER SUPPLY
8. •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 current to the inputs of IC1. This will upset the
balanced input of IC1 and convert the current into the corresponding
output voltage.
•Op-amp IC CA3130 (IC1) is used in the circuit as a current-to-voltage
converter with capacitor C3 connected between its inverting and noninverting 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.
.
8
9. •Capacitor C4 along with high-value resistor R1 keeps the noninverting input stable for easy swing of the output to high state.
Resistor R2 provides the discharge path for capacitor C4. Feedback
resistor R3 makes the inverting input high when the output becomes
high. Capacitor C5 (47pF) is connected across „strobe‟ (pin 0 and „null‟
inputs (pin 1) of IC1 for phase compensation and gain control to
optimise 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.
9
10. Use of capacitor
•A capacitor has two electrodes separated by a „dielectric‟ like paper,
mica etc. The non polarized disc capacitor is used to pass AC and not DC.
Capacitor can store energy and pass AC signals during discharge.
• 0.22 capacitor is selected because it is a low value one and has large
surface area to accept energy from the mobile radiation.
•To detect the signal, the sensor part should be like an aerial. So the
capacitor is arranged as a mini loop aerial (similar to the dipole antenna
used in TV).
10
11. Technical Specifications
1) Radio System
2) Access Method – FDMA/TDMA
3)FREQUENCY BANDS
Mobile to BTS:
GSM-900 system:- 890Mhz to 915 MHz
GSM-1800 system:- 1710 MHz to 1785 MHz
BTS To Mobile:
GSM-900 system:- 935Mhz to 960 MHz
GSM-1800 system:- 1805 MHz to 1880 MHz
4)Chanel/ carrier bandwidth :- 200Khz
5)Number of channels defined
GSM-900 system:- 124
GSM-1800 system:-374
1.
1111
10/15/2013
12. 6) TDMA Frame:- 8 time slot/ burst Period
7) Voice coding:- RPE-LTP ( regular pulse excited long term prediction )
Bit rate per voice channel:- 13 Kbps.
Net bit rate of 1 carrier :- 270.833 Kbps
1.
1212
10/15/2013
13. How the capacitor senses RF?
One lead of the capacitor gets DC from the positive input and the other
lead goes to the negative input of IC1. So the capacitor gets energy for
storage.But at any time IC can give a high output if a small current is
induced to its inputs.When the mobile phone radiates high energy
pulsations, capacitor oscillates and release energy in the inputs of IC. This
oscillation is indicated by the flashing of the LED and beeping of Buzzer.
In short, capacitor carries energy and is in an electromagnetic field. So a
slight change in field caused by the RF from phone will disturb the field
and forces the capacitor to release energy.
13
10/15/2013
14. WORKING OF MOBILE BUG
Purpose of the circuit
This circuit is intended to detect unauthorized use of mobile phones in
examination halls, confidential rooms etc. It also helps to detect
unauthorized video and audio recordings. It detects the signal from mobile
phones even if it is kept in the silent mode. It also detects SMS.
CONCEPT
Mobile phone uses RF with a wavelength of 30cm at 872 to 2170 MHz.
That is the signal is high frequency with huge energy. When the mobile
phone is active, it transmits the signal in the form of sine wave which
passes through the space. The encoded audio/video signal contains
electromagnetic radiation which is picked up by the receiver in the base
station. Mobile phone system is referred to as “Cellular Telephone system”
because the coverage area is divided into “cells” each of which has a base
station.
14
15. • Each handset with in a „cell‟ is allotted a particular frequency for its use.
•The mobile phone transmits short signals at regular intervals to register its
availability to the nearest base station.
• The network data base stores the information transmitted by the mobile
phone. If the mobile phone moves from one cell to another, it will keep the
connection with the base station having strongest transmission.
15
16. •AM Radio uses frequencies between 180 kHz and 1.6 MHz. FM radio uses
88 to 180 MHz. TV uses 470 to 854 MHz. Waves at higher frequencies but
with in the RF region is called Micro waves.
•Mobile phone uses high frequency RF wave in the micro wave region
carrying huge amount of electromagnetic energy. That is why burning
sensation develops in the ear if the mobile is used for a long period.
•RF radiation from the phone causes oscillation of polar molecules like
water in the tissues. This generates heat through friction just like the
principle of microwave oven. The strongest radiation from the mobile
phone is about 2 watts which can make connection with a base station
located 2 to 3 km away.
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17. How the circuit works?
Ordinary LC (Coil-Capacitor) circuits are used to detect low frequency
radiation in the AM and FM bands. The tuned tank circuit having a coil and
a variable capacitor retrieve the signal from the carrier wave. But such LC
circuits cannot detect high frequency waves near the microwave region.
Hence in the circuit, a capacitor is used to detect RF from mobile phone
considering that, a capacitor can store energy even from an outside source
and oscillate like LC circuit.
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19. HOW IC WORK?
ROLE OF IC CA 3130
This IC is a 15 MHz BiMOS Operational amplifier with MOSFET inputs and
Bipolar output. The inputs contain MOSFET transistors to provide very high
input impedance and very low input current as low as 10pA. It has high
speed of performance and suitable for low input current applications.
CA3130A and CA3130 are op amps that combine the advantage of both
CMOS and bipolar transistors. Gate-protected P-Channel MOSFET (PMOS)
transistors are used in the input circuit to provide very-high-input impedance,
very-low-input current, and exceptional speed performance. The use of
PMOS transistors in the input stage results in common-mode input-voltage
capability down to0.5V below the negative-supply terminal, an important
attribute in single-supply applications.
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20. A CMOS transistor-pair, capable of swinging the output voltage to within
10mV of either supply-voltage terminal (at very high values of load
impedance), is employed as the output circuit.
The CA3130 Series circuits operate at supply voltages ranging from 5V to
16V. They can be phase compensated with a single external capacitor, and
have terminals for adjustment of offset voltage for applications requiring
offset-null capability. Terminal provisions are also made to permit strobing
of the output stage. The CA3130A offers superior input characteristics over
those of the CA3130.
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21. Features
• MOSFET Input Stage Provides:
- Very High ZI = 1.5 T
- Very Low current =5pA at 15V Operation
• Ideal for Single-Supply Applications
• Common-Mode Input-Voltage Range Includes Negative Supply Rail; Input
Terminals can be Swung 0.5VBelow Negative Supply Rail
• CMOS Output Stage Permits Signal Swing to Either (or both) Supply Rails
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22. Applications
• Ground-Referenced Single Supply Amplifiers
• Fast Sample-Hold Amplifiers
• Long-Duration Timers/ Mono stables
• High-Input-Impedance Comparators (Ideal Interface with Digital CMOS)
• High-Input-Impedance Wideband Amplifiers
• Voltage Followers (e.g. Follower for Single-Supply D/A Converter )
• Voltage Regulators (Permits Control of Output Voltage Down to 0V)
• Peak Detectors
• Single-Supply Full-Wave Precision Rectifiers
• Photo-Diode Sensor Amplifiers
22
23. (2) IC NE 555 TIMER
The NE555 IC is a highly stable controller capable of producing accurate
timing pulses. With a monostable operation, the time delay is controlled by
one external resistor and one capacitor. With an astable operation, the
frequency and duty cycle are accurately controlled by two external resistors
and one capacitor.
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24. DETAILS OF PIN
Ground, is the input pin of the source of the negative DC voltage trigger,
negative input from the lower comparators (comparator B) that maintain
oscillation capacitor voltage in the lowest 1 / 3 Vcc and set RS flip-flop output,
the output pin of the IC 555. Reset, the pin that serves to reset the latch inside
the IC to be influential to reset the IC work. This pin is connected to a PNPtype transistor gate, so the transistor will be active if given a logic low.
Normally this pin is connected directly to Vcc to prevent reset control voltage,
this pin serves to regulate the stability of the reference voltage negative input
(comparator A). This pin can be left hanging, but to ensure the stability of the
reference comparator A, usually associated with a capacitor of about 10nF to
berorde pin ground.
24
25. threshold, this pin is connected to the positive input (comparator A) which
will reset the RS flip-flop when the voltage on the capacitor from exceeding 2
/ 3 Vcc discharge, this pin is connected to an open collector transistor Q1 is
connected to ground emitternya. Switching transistor serves to clamp the
corresponding node to ground on the timing of certain vcc, pin it to receive a
DC voltage supply. Usually will work optimally if given a 5-15V. the current
supply can be seen in the datasheet, which is about 10-15mA.
Features
• High Current Drive Capability (200mA)
• Adjustable Duty Cycle
• Temperature Stability of 0.005%/
C
• Timing From to Hours
Sec
• Turn off Time Less Than 2
Sec
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27. (3) PIEZO BUZZER
Piezoelectricity is the ability of some materials (notably crystals and certain
ceramics, including bone) to generate an electric field or electric potential in
response to applied mechanical stress. The effect is closely related to a change
of polarization density within the material's volume. If the material is not shortcircuited, the applied stress induces a voltage across the material. The word is
derived from the Greek piezo or piezein, which means to squeeze or press.
A buzzer or beeper is a signalling device, usually electronic, typically used in
automobiles, household appliances such as microwave ovens, or game shows.
It most commonly consists of a number of switches or sensors connected to a
control unit that determines if and which button was pushed or a preset time has
lapsed, and usually illuminates a light on the appropriate button or control
panel, and sounds a warning in the form of a continuous or intermittent buzzing
or beeping sound.
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28. PROBLEM IDENTIFICATION
Some common problems with mobile phone detector are detection of
one mobile phone at a time.
Is is most difficult to receive multi signal at a time.
Soldering of the circuit is not proper than the circuit will not receive
the proper signal
Range of the system is very small so it can cover only the radius of
few meters so it will detect only small number of units unde its radius.
29. APPLICATION
•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.
•It is useful where the use of mobile phone is prohibited Like petrol
pumps and gas stations, historical places, religious places and court of
laws
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30. LIMITATION
RANGE OF THE CIRCUIT
•The prototype version has only limited range of 5 meters. But if a preamplifier
stage using JFET or MOSFET transistor is used as an interface between the
capacitor and IC, range can be increased.
•Mobile phone can only be detected if it is switched on and ONLINE mode.
FUTURE WORK
•Trying to increase the detecting range of mobile bug to few more meters for
observing wide range of area.
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31. CONCLUSION
This pocket-size mobile transmission detector or sniffer can sense the presence
of an activated mobile cellphone from a distance of one and-a-half metres. 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.
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34. REFERENCE
1. Mobile Phone Sniffer track down mobile phones using
this handy directional finder Design by B. Kainka.
2. “Cell Phone Detection Techniques”, U.S. Department of Energy. October
2007. Accessed January, 2010.
3. ARPN Journal of Science and Technology: Novel Mobile Detector
Sensing Alarming and Reporting System K.Mohan Dece, SRM University
VOL. 2, NO. 1, January 2012
4. “Cell Phone Detector”, Circuit-Projects.com Quality Circuits Archive.
Accessed March, 2009.
5.www.datasheets4u.com
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10/15/2013