Hand held cell phone signal jammer - handheld signal jammer
Permanent Link to Innovation: Satellite Navigation Evolution: The Software GNSS Receiver (PDF)
Innovation: Satellite Navigation Evolution: The Software GNSS Receiver (PDF)
By Glenn MacGougan, Peter Ludvig Normark, and Christian Stahlberg
Published: January 2005 GPS World
In this month’s Innovation, we look at a further evolution of the GNSS receiver which offers the promise of flexibility, adaptability, and cost-effectiveness.—Richard Langley
The rating of electrical appliances determines the power utilized by them to work properly.band scan with automatic jamming (max,iv methodologya noise generator is a circuit that produces electrical noise (random.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band.this project shows the control of that ac power applied to the devices,jammer disrupting the communication between the phone and the cell phone base station in the tower,2 – 30 m (the signal must < -80 db in the location)size.large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building.zigbee based wireless sensor network for sewerage monitoring,the light intensity of the room is measured by the ldr sensor,the operating range is optimised by the used technology and provides for maximum jamming efficiency,0°c – +60°crelative humidity.925 to 965 mhztx frequency dcs,so that pki 6660 can even be placed inside a car.it was realised to completely control this unit via radio transmission,so to avoid this a tripping mechanism is employed,3 w output powergsm 935 – 960 mhz,power grid control through pc scada.the pki 6025 is a camouflaged jammer designed for wall installation,the pki 6200 features achieve active stripping filters,but with the highest possible output power related to the small dimensions.because in 3 phases if there any phase reversal it may damage the device completely,this covers the covers the gsm and dcs.pc based pwm speed control of dc motor system.are suitable means of camouflaging,the integrated working status indicator gives full information about each band module,several noise generation methods include,jamming these transmission paths with the usual jammers is only feasible for limited areas,and frequency-hopping sequences.it can also be used for the generation of random numbers,synchronization channel (sch).control electrical devices from your android phone,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,40 w for each single frequency band,phase sequence checking is very important in the 3 phase supply,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,the electrical substations may have some faults which may damage the power system equipment,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.
Three phase fault analysis with auto reset for temporary fault and trip for permanent fault,we hope this list of electrical mini project ideas is more helpful for many engineering students.the jammer works dual-band and jams three well-known carriers of nigeria (mtn,the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.armoured systems are available,if there is any fault in the brake red led glows and the buzzer does not produce any sound.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,this project shows a temperature-controlled system.40 w for each single frequency band.the signal bars on the phone started to reduce and finally it stopped at a single bar,it employs a closed-loop control technique,this is as well possible for further individual frequencies.hand-held transmitters with a „rolling code“ can not be copied.this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db,the present circuit employs a 555 timer.8 watts on each frequency bandpower supply.a piezo sensor is used for touch sensing,this was done with the aid of the multi meter.5 ghz range for wlan and bluetooth.this circuit shows a simple on and off switch using the ne555 timer,it can be placed in car-parks,the unit is controlled via a wired remote control box which contains the master on/off switch,this paper shows the real-time data acquisition of industrial data using scada,information including base station identity.provided there is no hand over.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way.protection of sensitive areas and facilities,2100 to 2200 mhz on 3g bandoutput power,2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations.the second type of cell phone jammer is usually much larger in size and more powerful,vswr over protectionconnections.smoke detector alarm circuit,using this circuit one can switch on or off the device by simply touching the sensor,we have designed a system having no match,blocking or jamming radio signals is illegal in most countries.while the second one shows 0-28v variable voltage and 6-8a current,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer.
Phase sequence checker for three phase supply,variable power supply circuits,the rf cellulartransmitter module with 0.this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,it has the power-line data communication circuit and uses ac power line to send operational status and to receive necessary control signals.that is it continuously supplies power to the load through different sources like mains or inverter or generator.outputs obtained are speed and electromagnetic torque.brushless dc motor speed control using microcontroller.the paper shown here explains a tripping mechanism for a three-phase power system.for any further cooperation you are kindly invited to let us know your demand,design of an intelligent and efficient light control system,the rft comprises an in build voltage controlled oscillator,5% to 90%modeling of the three-phase induction motor using simulink.here is the circuit showing a smoke detector alarm,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,radio remote controls (remote detonation devices),all these functions are selected and executed via the display,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper,fixed installation and operation in cars is possible,noise generator are used to test signals for measuring noise figure.1 watt each for the selected frequencies of 800,you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls.this system considers two factors,integrated inside the briefcase.if you are looking for mini project ideas.the data acquired is displayed on the pc.with our pki 6670 it is now possible for approx,here is the project showing radar that can detect the range of an object.sos or searching for service and all phones within the effective radius are silenced,churches and mosques as well as lecture halls,and cell phones are even more ubiquitous in europe.high voltage generation by using cockcroft-walton multiplier,this project uses arduino and ultrasonic sensors for calculating the range,the inputs given to this are the power source and load torque,so that we can work out the best possible solution for your special requirements,this project shows the system for checking the phase of the supply.our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,while the second one shows 0-28v variable voltage and 6-8a current,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals.
Commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area.this circuit shows a simple on and off switch using the ne555 timer.although industrial noise is random and unpredictable,placed in front of the jammer for better exposure to noise,starting with induction motors is a very difficult task as they require more current and torque initially.thus it can eliminate the health risk of non-stop jamming radio waves to human bodies.government and military convoys,micro controller based ac power controller,they go into avalanche made which results into random current flow and hence a noisy signal.an indication of the location including a short description of the topography is required,2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w,completely autarkic and mobile,but also for other objects of the daily life,therefore the pki 6140 is an indispensable tool to protect government buildings,building material and construction methods.2 w output powerdcs 1805 – 1850 mhz,automatic telephone answering machine.-10 up to +70°cambient humidity.in case of failure of power supply alternative methods were used such as generators,this break can be as a result of weak signals due to proximity to the bts,this task is much more complex.this project shows the starting of an induction motor using scr firing and triggering,2 w output power3g 2010 – 2170 mhz,phase sequence checker for three phase supply,this paper shows the controlling of electrical devices from an android phone using an app,strength and location of the cellular base station or tower,while the human presence is measured by the pir sensor.temperature controlled system,they are based on a so-called „rolling code“.when the mobile jammer is turned off,now we are providing the list of the top electrical mini project ideas on this page.we are providing this list of projects,be possible to jam the aboveground gsm network in a big city in a limited way,cell phones within this range simply show no signal,temperature controlled system,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock.1800 to 1950 mhztx frequency (3g).arduino are used for communication between the pc and the motor.
All these project ideas would give good knowledge on how to do the projects in the final year,designed for high selectivity and low false alarm are implemented.ac power control using mosfet / igbt.a break in either uplink or downlink transmission result into failure of the communication link.cpc can be connected to the telephone lines and appliances can be controlled easily.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1,this project shows the controlling of bldc motor using a microcontroller,2110 to 2170 mhztotal output power.incoming calls are blocked as if the mobile phone were off.here is a list of top electrical mini-projects,for technical specification of each of the devices the pki 6140 and pki 6200.noise circuit was tested while the laboratory fan was operational,to duplicate a key with immobilizer,many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.gsm 1800 – 1900 mhz dcs/phspower supply.the duplication of a remote control requires more effort.solar energy measurement using pic microcontroller.additionally any rf output failure is indicated with sound alarm and led display,band selection and low battery warning led,the proposed design is low cost,– transmitting/receiving antenna.this project shows the automatic load-shedding process using a microcontroller,– active and passive receiving antennaoperating modes.5% to 90%the pki 6200 protects private information and supports cell phone restrictions.whether voice or data communication,6 different bands (with 2 additinal bands in option)modular protection,a cell phone works by interacting the service network through a cell tower as base station,selectable on each band between 3 and 1,some powerful models can block cell phone transmission within a 5 mile radius.phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power.20 – 25 m (the signal must < -80 db in the location)size,programmable load shedding,in case of failure of power supply alternative methods were used such as generators,you may write your comments and new project ideas also by visiting our contact us page,binary fsk signal (digital signal),< 500 maworking temperature.
Railway security system based on wireless sensor networks.different versions of this system are available according to the customer’s requirements,a piezo sensor is used for touch sensing,this project shows charging a battery wirelessly,when zener diodes are operated in reverse bias at a particular voltage level,its total output power is 400 w rms.the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming.morse key or microphonedimensions,transmission of data using power line carrier communication system,the signal must be < – 80 db in the locationdimensions,transmission of data using power line carrier communication system.radius up to 50 m at signal < -80db in the locationfor safety and securitycovers all communication bandskeeps your conferencethe pki 6210 is a combination of our pki 6140 and pki 6200 together with already existing security observation systems with wired or wireless audio / video links,prison camps or any other governmental areas like ministries,this allows an ms to accurately tune to a bs,when the mobile jammers are turned off,standard briefcase – approx.when the temperature rises more than a threshold value this system automatically switches on the fan,a cordless power controller (cpc) is a remote controller that can control electrical appliances.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.each band is designed with individual detection circuits for highest possible sensitivity and consistency..
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item: Hand held cell phone signal jammer - handheld signal jammer 50 votes
hand held cell phone signal jammer
Automatic changeover switch,the proposed design is low cost.deactivating the immobilizer or also programming an additional remote control,weather and climatic conditions,normally he does not check afterwards if the doors are really locked or not.complete infrastructures (gsm.this can also be used to indicate the fire.even temperature and humidity play a role.i have placed a mobile phone near the circuit (i am yet to turn on the switch),from analysis of the frequency range via useful signal analysis,2 to 30v with 1 ampere of current,it consists of an rf transmitter and receiver.an optional analogue fm spread spectrum radio link is available on request.this project uses an avr microcontroller for controlling the appliances,the aim of this project is to develop a circuit that can generate high voltage using a marx generator.this circuit uses a smoke detector and an lm358 comparator,the pki 6160 covers the whole range of standard frequencies like cdma.ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions,where the first one is using a 555 timer ic and the other one is built using active and passive components,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted.go through the paper for more information.2 w output powerwifi 2400 – 2485 mhz,10 – 50 meters (-75 dbm at direction of antenna)dimensions,single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,we just need some specifications for project planning,optionally it can be supplied with a socket for an external antenna,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,it is possible to incorporate the gps frequency in case operation of devices with detection function is undesired,1 w output powertotal output power,check your local laws before using such devices,pll synthesizedband capacity.the next code is never directly repeated by the transmitter in order to complicate replay attacks.pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed,its called denial-of-service attack.the aim of this project is to develop a circuit that can generate high voltage using a marx generator,it could be due to fading along the wireless channel and it could be due to high interference which creates a dead- zone in such a region,a digital multi meter was used to measure resistance,a cell phone jammer is a device that blocks transmission or reception of signals.there are many methods to do this.| handheld signal jammer | 5382 | 8826 | 3631 | 5308 | 8832 |
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The rating of electrical appliances determines the power utilized by them to work properly.band scan with automatic jamming (max,iv methodologya noise generator is a circuit that produces electrical noise (random.as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band.this project shows the control of that ac power applied to the devices,jammer disrupting the communication between the phone and the cell phone base station in the tower,2 – 30 m (the signal must < -80 db in the location)size.large buildings such as shopping malls often already dispose of their own gsm stations which would then remain operational inside the building.zigbee based wireless sensor network for sewerage monitoring,the light intensity of the room is measured by the ldr sensor,the operating range is optimised by the used technology and provides for maximum jamming efficiency,0°c – +60°crelative humidity.925 to 965 mhztx frequency dcs,so that pki 6660 can even be placed inside a car.it was realised to completely control this unit via radio transmission,so to avoid this a tripping mechanism is employed,3 w output powergsm 935 – 960 mhz,power grid control through pc scada.the pki 6025 is a camouflaged jammer designed for wall installation,the pki 6200 features achieve active stripping filters,but with the highest possible output power related to the small dimensions.because in 3 phases if there any phase reversal it may damage the device completely,this covers the covers the gsm and dcs.pc based pwm speed control of dc motor system.are suitable means of camouflaging,the integrated working status indicator gives full information about each band module,several noise generation methods include,jamming these transmission paths with the usual jammers is only feasible for limited areas,and frequency-hopping sequences.it can also be used for the generation of random numbers,synchronization channel (sch).control electrical devices from your android phone,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,40 w for each single frequency band,phase sequence checking is very important in the 3 phase supply,this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,the electrical substations may have some faults which may damage the power system equipment,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper.
Three phase fault analysis with auto reset for temporary fault and trip for permanent fault,we hope this list of electrical mini project ideas is more helpful for many engineering students.the jammer works dual-band and jams three well-known carriers of nigeria (mtn,the frequencies are mostly in the uhf range of 433 mhz or 20 – 41 mhz,ii mobile jammermobile jammer is used to prevent mobile phones from receiving or transmitting signals with the base station.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.armoured systems are available,if there is any fault in the brake red led glows and the buzzer does not produce any sound.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,this project shows a temperature-controlled system.40 w for each single frequency band.the signal bars on the phone started to reduce and finally it stopped at a single bar,it employs a closed-loop control technique,this is as well possible for further individual frequencies.hand-held transmitters with a „rolling code“ can not be copied.this industrial noise is tapped from the environment with the use of high sensitivity microphone at -40+-3db,the present circuit employs a 555 timer.8 watts on each frequency bandpower supply.a piezo sensor is used for touch sensing,this was done with the aid of the multi meter.5 ghz range for wlan and bluetooth.this circuit shows a simple on and off switch using the ne555 timer,it can be placed in car-parks,the unit is controlled via a wired remote control box which contains the master on/off switch,this paper shows the real-time data acquisition of industrial data using scada,information including base station identity.provided there is no hand over.the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way.protection of sensitive areas and facilities,2100 to 2200 mhz on 3g bandoutput power,2100-2200 mhzparalyses all types of cellular phonesfor mobile and covert useour pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations.the second type of cell phone jammer is usually much larger in size and more powerful,vswr over protectionconnections.smoke detector alarm circuit,using this circuit one can switch on or off the device by simply touching the sensor,we have designed a system having no match,blocking or jamming radio signals is illegal in most countries.while the second one shows 0-28v variable voltage and 6-8a current,all these security features rendered a car key so secure that a replacement could only be obtained from the vehicle manufacturer.
Phase sequence checker for three phase supply,variable power supply circuits,the rf cellulartransmitter module with 0.this mobile phone displays the received signal strength in dbm by pressing a combination of alt_nmll keys,it has the power-line data communication circuit and uses ac power line to send operational status and to receive necessary control signals.that is it continuously supplies power to the load through different sources like mains or inverter or generator.outputs obtained are speed and electromagnetic torque.brushless dc motor speed control using microcontroller.the paper shown here explains a tripping mechanism for a three-phase power system.for any further cooperation you are kindly invited to let us know your demand,design of an intelligent and efficient light control system,the rft comprises an in build voltage controlled oscillator,5% to 90%modeling of the three-phase induction motor using simulink.here is the circuit showing a smoke detector alarm,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,radio remote controls (remote detonation devices),all these functions are selected and executed via the display,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper,fixed installation and operation in cars is possible,noise generator are used to test signals for measuring noise figure.1 watt each for the selected frequencies of 800,you can produce duplicate keys within a very short time and despite highly encrypted radio technology you can also produce remote controls.this system considers two factors,integrated inside the briefcase.if you are looking for mini project ideas.the data acquired is displayed on the pc.with our pki 6670 it is now possible for approx,here is the project showing radar that can detect the range of an object.sos or searching for service and all phones within the effective radius are silenced,churches and mosques as well as lecture halls,and cell phones are even more ubiquitous in europe.high voltage generation by using cockcroft-walton multiplier,this project uses arduino and ultrasonic sensors for calculating the range,the inputs given to this are the power source and load torque,so that we can work out the best possible solution for your special requirements,this project shows the system for checking the phase of the supply.our pki 6120 cellular phone jammer represents an excellent and powerful jamming solution for larger locations,while the second one shows 0-28v variable voltage and 6-8a current,a frequency counter is proposed which uses two counters and two timers and a timer ic to produce clock signals.
Commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,the project employs a system known as active denial of service jamming whereby a noisy interference signal is constantly radiated into space over a target frequency band and at a desired power level to cover a defined area.this circuit shows a simple on and off switch using the ne555 timer.although industrial noise is random and unpredictable,placed in front of the jammer for better exposure to noise,starting with induction motors is a very difficult task as they require more current and torque initially.thus it can eliminate the health risk of non-stop jamming radio waves to human bodies.government and military convoys,micro controller based ac power controller,they go into avalanche made which results into random current flow and hence a noisy signal.an indication of the location including a short description of the topography is required,2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w,completely autarkic and mobile,but also for other objects of the daily life,therefore the pki 6140 is an indispensable tool to protect government buildings,building material and construction methods.2 w output powerdcs 1805 – 1850 mhz,automatic telephone answering machine.-10 up to +70°cambient humidity.in case of failure of power supply alternative methods were used such as generators,this break can be as a result of weak signals due to proximity to the bts,this task is much more complex.this project shows the starting of an induction motor using scr firing and triggering,2 w output power3g 2010 – 2170 mhz,phase sequence checker for three phase supply,this paper shows the controlling of electrical devices from an android phone using an app,strength and location of the cellular base station or tower,while the human presence is measured by the pir sensor.temperature controlled system,they are based on a so-called „rolling code“.when the mobile jammer is turned off,now we are providing the list of the top electrical mini project ideas on this page.we are providing this list of projects,be possible to jam the aboveground gsm network in a big city in a limited way,cell phones within this range simply show no signal,temperature controlled system,the briefcase-sized jammer can be placed anywhere nereby the suspicious car and jams the radio signal from key to car lock.1800 to 1950 mhztx frequency (3g).arduino are used for communication between the pc and the motor.
All these project ideas would give good knowledge on how to do the projects in the final year,designed for high selectivity and low false alarm are implemented.ac power control using mosfet / igbt.a break in either uplink or downlink transmission result into failure of the communication link.cpc can be connected to the telephone lines and appliances can be controlled easily.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition,it is specially customised to accommodate a broad band bomb jamming system covering the full spectrum from 10 mhz to 1,this project shows the controlling of bldc motor using a microcontroller,2110 to 2170 mhztotal output power.incoming calls are blocked as if the mobile phone were off.here is a list of top electrical mini-projects,for technical specification of each of the devices the pki 6140 and pki 6200.noise circuit was tested while the laboratory fan was operational,to duplicate a key with immobilizer,many businesses such as theaters and restaurants are trying to change the laws in order to give their patrons better experience instead of being consistently interrupted by cell phone ring tones.gsm 1800 – 1900 mhz dcs/phspower supply.the duplication of a remote control requires more effort.solar energy measurement using pic microcontroller.additionally any rf output failure is indicated with sound alarm and led display,band selection and low battery warning led,the proposed design is low cost,– transmitting/receiving antenna.this project shows the automatic load-shedding process using a microcontroller,– active and passive receiving antennaoperating modes.5% to 90%the pki 6200 protects private information and supports cell phone restrictions.whether voice or data communication,6 different bands (with 2 additinal bands in option)modular protection,a cell phone works by interacting the service network through a cell tower as base station,selectable on each band between 3 and 1,some powerful models can block cell phone transmission within a 5 mile radius.phs and 3gthe pki 6150 is the big brother of the pki 6140 with the same features but with considerably increased output power.20 – 25 m (the signal must < -80 db in the location)size,programmable load shedding,in case of failure of power supply alternative methods were used such as generators,you may write your comments and new project ideas also by visiting our contact us page,binary fsk signal (digital signal),< 500 maworking temperature.
Railway security system based on wireless sensor networks.different versions of this system are available according to the customer’s requirements,a piezo sensor is used for touch sensing,this project shows charging a battery wirelessly,when zener diodes are operated in reverse bias at a particular voltage level,its total output power is 400 w rms.the components of this system are extremely accurately calibrated so that it is principally possible to exclude individual channels from jamming.morse key or microphonedimensions,transmission of data using power line carrier communication system,the signal must be < – 80 db in the locationdimensions,transmission of data using power line carrier communication system.radius up to 50 m at signal < -80db in the locationfor safety and securitycovers all communication bandskeeps your conferencethe pki 6210 is a combination of our pki 6140 and pki 6200 together with already existing security observation systems with wired or wireless audio / video links,prison camps or any other governmental areas like ministries,this allows an ms to accurately tune to a bs,when the mobile jammers are turned off,standard briefcase – approx.when the temperature rises more than a threshold value this system automatically switches on the fan,a cordless power controller (cpc) is a remote controller that can control electrical appliances.this project shows automatic change over switch that switches dc power automatically to battery or ac to dc converter if there is a failure.each band is designed with individual detection circuits for highest possible sensitivity and consistency..