26-01-2012, 10:51 AM
to get information about the topic"mobile phone detector"refer the link bellow
https://seminarproject.net/Thread-mobile-phone-detector
https://seminarproject.net/Thread-mobile-phone-detector
26-01-2012, 10:51 AM
to get information about the topic"mobile phone detector"refer the link bellow
https://seminarproject.net/Thread-mobile-phone-detector
07-02-2012, 09:59 PM
Sounds to be a good one,I want to try it.. do help me with the source code,diagram to smart.enough43[at]gmail.com
Regards.
08-02-2012, 10:17 AM
to get information about the topic mobile phone detector full report refer the link bellow
https://seminarproject.net/Thread-mobile-phone-detector
08-02-2012, 10:54 AM
to get information about the topic mobile phone detector full report refer the link bellow
https://seminarproject.net/Thread-mobile-phone-detector
11-02-2012, 11:17 AM
to get information about the topic mobile phone cloning full report ,ppt and related topic refer the link bellow
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04-10-2012, 12:41 PM
Mobile Phone Detector
Mobile Phone.docx (Size: 3.51 MB / Downloads: 37) INTRODUCTION This handy cell phone detector, pocket-size mobile transmission detector can sense the presence of an activated mobile cell phone from a short distance. 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. It senses the radio frequency (RF) transmissions from nearby cellular or mobile phones. If required, other sources of RF transmissions can also be detected including two-way radios, and other wireless communication devices. When a transmission is detected, an alarm sequence begins that may include any combination of visual LED glows. In addition the unit can be used as a static or portable detector, and it can be used to generate remote alarms, activate other equipment (including remote indication devices) and extend alarm messages into other areas. Cellular phone technology is rapidly changing. Features like Bluetooth, USB, high resolution cameras, microphones, Internet, 802.11 wireless, and memory cards are added every year. Also, the communication technology a cellular phone uses such as CDMA, GSM, 3G, and 4G are rapidly changing. Hence there is more chance for leaking of confidential matter. In order to avoid such leakage of information cell phone detectors are used. ANTENNA The size and shape of the antenna and the way it's constructed determine the gain and directivity of the antenna. The antenna transmits and receives electromagnetic signals. When gain increases the amount of desired signal energy that can be captured Increase but the amount of environmental noise and interferences that's captured increases by the same amount. Antenna receives the radio frequency signals (RF signals) from the mobile phone. The radio frequency signals are grasped by the antenna. In the detection process we use a wire type antenna. An antenna (or aerial) is an electrical device which converts electric currents into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter applies an oscillating radio frequency electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals that is applied to a receiver to be amplified. An antenna can be used for both transmitting and receiving. IC CA3130 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 to 0.5V below the negative-supply terminal, an important attribute in single-supply applications. 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, (±2.5V to ±8V). 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. IC 555 TIMERS The 555 timer IC is an integrated circuit (chip) used in a variety of timer, pulse generation and oscillator applications. The part is still in widespread use, thanks to its ease of use, low price and good stability. As of 2003, it was estimated that 1 billion units are manufactured every year. Design The IC design was proposed in 1970 by Hans R. Camenzind and Jim Ball. After prototyping, the design was ported to the Monochip analogue array, incorporating detailed design by Wayne Foletta and others from Qualidyne Semiconductors. Signetics (later acquired by Philips) took over the design and production, and released the first 555s in 1971. Depending on the manufacturer, the standard 555 package includes over 20 transistors, 2 diodes and 15 resistors on a silicon chip installed in an 8-pin mini dual-in-line package (DIP-8).Variants available include the 556 (a 14-pin DIP combining two 555s on one chip), and the 558 (a 16-pin DIP combining four slightly modified 555s with DIS & THR connected internally, and TR is falling edge sensitive instead of level sensitive). Monostable Operation The relationships of the trigger signal, the voltage on C and the pulse width in monostable mode : In the monostable mode, the 555 timer acts as a “one-shot” pulse generator. The pulse begins when the 555 timer receives a signal at the trigger input that falls below a third of the voltage supply. The width of the output pulse is determined by the time constant of an RC network, which consists of a capacitor © and a resistor ®. The output pulse ends when the voltage on the capacitor equals 2/3 of the supply voltage. The output pulse width can be lengthened or shortened to the need of the specific application by adjusting the values of R and C. The output pulse width of time t, which is the time it takes to charge C to 2/3 of the supply voltage, is given by: Where t is in seconds, R is in ohms and C is in farads. See RC circuit for an explanation of this effect.While using the timer IC in monostable mode, the main disadvantage is that the time span between the two triggering pulses must be greater than the RC time constant. BC548 TRANSISTOR The BC548 is a general purpose silicon NPN BJT transistor. The "BC" part of the number designates a low power silicon NPN transistor. Transistor is a “CURRENT” operated device which has a very large amount of current (Ic) which flows without restraint through the device between the collector and emitter terminals. Transistors are circuit elements designed to function either as amplifiers or as switches. LED LED means Light Emitting Diode. It is an electronic device that lights up when electricity is passed through it. LEDs are usually red. They are good for displaying images because they can be relatively small.The moment the bug detects RF transmission signal from an activated mobile phone, it starts sounding a beep alarm and the LED blinks.LED‟s contain an integrated multivibrator circuit inside which causes the LED to flash with a typical time period. A light-emitting diode (LED) is a semiconductor light source.LED‟s are used as indicator lamps in many devices and are increasingly used for other lighting. When a light-emitting diode is forward-biased (switched on), electrons are able to recombine with electron holes within the device, releasing energy in the form of photons. This effect is called electroluminescence and the colour of the light (corresponding to the energy of the photon) is determined by the energy gap of the semiconductor. LEDs are often small in area (less than 1 mm2), and integrated optical components may be used to shape its radiation pattern LEDs present many advantages over incandescent light sources including lower energy consumption, longer lifetime, improved robustness, smaller size, and faster switching. LEDs powerful enough for room lighting are relatively expensive and require more precise current and heat management than compact fluorescent lamp sources of comparable output.
12-10-2012, 02:07 PM
send reqirement of making this project like circuit diagrame and other information
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