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01-07-2010, 06:14 PM
Post: #1
mobile bug
hie. I am Neelam Wadhwa.
I want to know about th futu prospects of mobile bug. Please help me out with this.
02-07-2010, 12:29 AM
Post: #2
RE: mobile bug
the presence of an activated mobile cellphone can be detected by using this cellphone ,pocket-size mobile transmission detector. The range can be upto one and-a-half metres. It can be installed in examination halls, confidential rooms, etc for detecting the use of cellphones. spying and unauthorised video transmission. etc can also be easily identified. incoming and outgoing calls, SMS and video transmission etc can be detected. moment the bug detects RF transmission signal , it indicates it either by a beep sound or flashing of an LED or both and remains on till the signal transmission stops. The mobile phones mobile phones uses frequencies that ranges from 0.9 to 3 GHz with a wavelength of 3.3 to 10 cm. Thus a mobile bug must detect signals in the gigahertz range. The circuit uses a 0.22microfarad disk capacitor to capture the RF signals from the mobile phone. The disk capacitor along with the leads acts as a small gigahertz loop antenna to collect the RF signals from the mobile phone. It contains a a current-to-voltage converter IC CA3130, a 555 IC, resistors, capacitors, transistor BC548.
The circuit is simple and all the components are easily available in electronic shops. This would make a good mini project. You can make the product as small as possible and enclose the project in a beautiful tiny box.

the working, circuit and other details can be obtained from these links:
http://electroschematics1035/mobile-bug-detector-sniffer/
http://dmohankumar.files.wordpress2010/0...ircuit.pdf

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02-10-2010, 09:15 PM
Post: #3
RE: mobile bug
mobile bug full report
MOBILE BUG
submitted by:
Gokulnath G
Ashwin V P
Deepak M S
College Of Engineering, Trivandrum

mobile bug full report with circuit diagram, PCB layout:

.pdf  gokul project.pdf (Size: 660.63 KB / Downloads: 453)

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11-10-2010, 10:18 AM
Post: #4
RE: mobile bug

.doc  17.mobile bug.doc (Size: 30 KB / Downloads: 164)
.doc  mobile bug.doc (Size: 33.5 KB / Downloads: 160)
MOBILE BUG




AIM:
The main aim of the project is to detect the presence of the mobile phone even if it is in silent mode.

PURPOSE:

The purpose of the project is to sense the presence of an activated mobile phone from a distance of one and half meters. So it can be used to prevent use of mobile phones in examination halls, confidential rooms etc.


DESCRIPTION:

This project consists of IC CA3130 operational amplifier, IC2 NE 555 monostable multivibrator and Buzzer. Mobile transmission data detector can sense the presence of an activated mobile phone from a distance of one and half meters. It also useful for detecting the use of mobile phone for spying and unauthorized video transmission.

It detects both incoming , outgoing calls, sms and video transmission even if mobile in silent mode.the moment the bug detects RF tx signal from an activated mobile phone and it starts sounding a beep alarm and led blinks .the alarm continues until the signal tx ceases.

Here the op-am IC CA 3130 is used as a current to voltage converter with capacitor C3.

When the mobile phone signal is detected by C3 the OUTPUT OFic1 becomes high and low alternatively according to the frequency of the signal indication by led1. this triggers monostable multivibrator IC2.


SOFTWARES:
1. Embedded C
2. Keil IDE
3. Uc-Flash
HARDWARES:
1. Power Supply
2. IC CA3130
3. IC NE 555
4. BUZZER
5. ANTENNA
16-03-2011, 12:13 PM
Post: #5
RE: mobile bug
PRESENTED BY:
Ramkishor
Rakesh Kumar Saini
Rahul Sharma
Upender Yadav


.doc  RAMKISHOR.doc (Size: 716 KB / Downloads: 134)
INTRODUCTION
This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone 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.
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.
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. So a circuit detecting gigahertz 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 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.
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 10 mV 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 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 8) 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.
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. 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 1.5 metres.
The 555 timer IC was first introduced around 1971 by the Signetics Corporation as the SE555/NE555 and was called "The IC Time Machine" and was also the very first and only commercial timer ic available. It provided circuit designers and hobby tinkerers with a relatively cheap, stable, and user-friendly integrated circuit for both monostable and astable applications. Since this device was first made commercially available, a myrad of novel and unique circuits have been developed and presented in several trade, professional, and hobby publications. The past ten years some manufacturers stopped making these timers because of competition or other reasons. Yet other companies, like NTE (a subdivision of Philips) picked up where some left off.
This primer is about this fantastic timer which is after 30 years still very popular and used in many schematics. Although these days the CMOS version of this IC, like the Motorola MC1455, is mostly used, the regular type is still available, however there have been many improvements and variations in the circuitry. But all types are pin-for-pin plug compatible. Myself, every time I see this 555 timer used in advanced and high-tech electronic circuits, I'm amazed. It is just incredible.
In this tutorial I will show you what exactly the 555 timer is and how to properly use it by itself or in combination with other solid state devices without the requirement of an engineering degree. This timer uses a maze of transistors, diodes and resistors and for this complex reason I will use a more simplified (but accurate) block diagram to explain the internal organizations of the 555. So, lets start slowly and build it up from there.
The first type-number, in Table 1 on the left, represents the type which was/is preferred for military applications which have somewhat improved electrical and thermal characteristics over their commercial counterparts, but also a bit more expensive, and usually metal-can or ceramic casing. This is analogous to the 5400/7400 series convention for TTL integrated circuits.

The 555, in fig. 1 and fig. 2 above, come in two packages, either the round metal- IP case. can called the 'T' package or the more familiar 8-pin DIP 'V' package. About 20-years ago the metal-can type was pretty much the standard (SE/NE types). The 556 timer is a dual 555 version and comes in a 14-pin DIP package, the 558 is a quad version with four 555's also in a 14 pin D
08-03-2012, 10:39 AM
Post: #6
RE: mobile bug
to get information about the topic"mobile bug" full report ppt and related topic refer the link bellow

http://seminarprojectsThread-mobile-bug

http://seminarprojectsThread-mobile-bug?pid=40628#pid40628
03-07-2012, 12:13 PM
Post: #7
RE: mobile bug
MOBILE BUG



.ppt  MOBILE BUG.ppt (Size: 1.02 MB / Downloads: 50)
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.

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). In short with this arrangement, the capacitor works like an air core coil with ability to oscillate and discharge current.

How the capacitor senses RF?

One lead of the capacitor gets DC from the positive rail and the other lead goes to the negative input of IC1. So the capacitor gets energy for storage. This energy is applied to the inputs of IC1 so that the inputs of IC are almost balanced with 1.4 volts. In this state output is zero. But at any time IC can give a high output if a small current is induced to its inputs.
There a natural electromagnetic field around the capacitor caused by the 50Hz from electrical wiring. 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.

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 unauthorised video transmission.
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