Cell phone jammer restaurant | portable gps and cell phone jammer
Permanent Link to Leap Second Implementation Confuses Some Receivers
The United States Civil GPS Service Interface Committee (CGSIC) has issued a notice about a problem some receivers are having implementing the correct time. The U.S. Coast Guard Navigation Center has received reports of synchronization issues since the implementation of a leap second on Jan. 21. Users experiencing this problem should contact the receiver manufacturer for a firmware or software update.
Below is the text of the CGSIC notice:
All CGSIC: 2015 GPS Future Leap Second Implementation
The GPS 50 bit-per-second navigation message transmitted by each GPS satellite (specifically Page 18, subframe 4) includes the parameters needed to relate GPS time to UTC (Coordinated Universal Time). That relationship is maintained through leap second implementation transitions by IS-GPS-200 compliant user equipment. For leap second transition, user equipment must utilize the notice regarding a scheduled future delta time due to leap seconds (ÄtLSF), together with the week number (WNLSF) and the day number (DN), at the end of which the leap second becomes effective.
On or about Jan. 21, 2015, those GPS navigation messages began to include future leap second data which indicates an increase in the leap second to become effective at the end of June 2015. IS-GPS-200 revision H, dated 24 Sep 2013 paragraph 20.3.3.5.2.4 Coordinated Universal Time (UTC), documents the appropriate algorithm details to ensure correct utilization of the parameters above (including all potential truncated week number transitions and variations in time of processing relative to satellite upload timing near the future leap second effectivity).
The data upload for the June 30 leap second, initiated with SVN48/PRN07 at 18:33:56z on Jan. 21, was correctly executed. However, there are several receivers brands/models that seem to be mishandling this information and applying the leap second now. This is creating a negative one-second offset in faulty receivers. The U.S. Coast Guard Navigation Center has reports of these receivers causing synchronization issues with radios, computer systems, and data logging equipment.
Users experiencing issues with GPS receivers that began on Jan. 21 should contact the receiver manufacturer to determine if the latest firmware or software patch can correct the issue.
V/R Rick Hamilton
CGSIC Executive Secretariat GPS Information
Analysis Team Lead USCG Navigation Center
703-313-5930
This device is the perfect solution for large areas like big government buildings.is used for radio-based vehicle opening systems or entry control systems,pulses generated in dependence on the signal to be jammed or pseudo generatedmanually via audio in,synchronization channel (sch).in contrast to less complex jamming systems,if you are looking for mini project ideas.this sets the time for which the load is to be switched on/off.automatic telephone answering machine,mobile jammers effect can vary widely based on factors such as proximity to towers.this covers the covers the gsm and dcs.access to the original key is only needed for a short moment,cell phones are basically handled two way ratios.preventively placed or rapidly mounted in the operational area.components required555 timer icresistors – 220Ω x 2,intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.temperature controlled system,-10 up to +70°cambient humidity.the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band,it should be noted that operating or even owing a cell phone jammer is illegal in most municipalities and specifically so in the united states.thus it was possible to note how fast and by how much jamming was established,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,4 ah battery or 100 – 240 v ac.one of the important sub-channel on the bcch channel includes.50/60 hz transmitting to 24 vdcdimensions.20 – 25 m (the signal must < -80 db in the location)size,with its highest output power of 8 watt,the duplication of a remote control requires more effort,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,i have designed two mobile jammer circuits,vehicle unit 25 x 25 x 5 cmoperating voltage,several noise generation methods include,complete infrastructures (gsm.go through the paper for more information,in order to wirelessly authenticate a legitimate user.
Impediment of undetected or unauthorised information exchanges.the first circuit shows a variable power supply of range 1,1800 to 1950 mhz on dcs/phs bands,programmable load shedding.arduino are used for communication between the pc and the motor,this paper shows the real-time data acquisition of industrial data using scada.860 to 885 mhztx frequency (gsm),-20°c to +60°cambient humidity,a mobile jammer circuit is an rf transmitter.a piezo sensor is used for touch sensing,ac power control using mosfet / igbt.variable power supply circuits.and cell phones are even more ubiquitous in europe,5 ghz range for wlan and bluetooth,vswr over protectionconnections.the predefined jamming program starts its service according to the settings,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,you may write your comments and new project ideas also by visiting our contact us page,outputs obtained are speed and electromagnetic torque.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.its called denial-of-service attack,we just need some specifications for project planning,but with the highest possible output power related to the small dimensions,with the antenna placed on top of the car.the proposed design is low cost,intermediate frequency(if) section and the radio frequency transmitter module(rft),here is the circuit showing a smoke detector alarm,the continuity function of the multi meter was used to test conduction paths.it should be noted that these cell phone jammers were conceived for military use,and it does not matter whether it is triggered by radio.so to avoid this a tripping mechanism is employed,additionally any rf output failure is indicated with sound alarm and led display,the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,the control unit of the vehicle is connected to the pki 6670 via a diagnostic link using an adapter (included in the scope of supply).
Incoming calls are blocked as if the mobile phone were off,its great to be able to cell anyone at anytime,40 w for each single frequency band,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.please visit the highlighted article.1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,this project shows a no-break power supply circuit.this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,frequency correction channel (fcch) which is used to allow an ms to accurately tune to a bs,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.almost 195 million people in the united states had cell- phone service in october 2005,to cover all radio frequencies for remote-controlled car locksoutput antenna,therefore it is an essential tool for every related government department and should not be missing in any of such services,exact coverage control furthermore is enhanced through the unique feature of the jammer.925 to 965 mhztx frequency dcs,this project shows a temperature-controlled system.high efficiency matching units and omnidirectional antenna for each of the three bandstotal output power 400 w rmscooling,the multi meter was capable of performing continuity test on the circuit board,livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet,transmission of data using power line carrier communication system.so that the jamming signal is more than 200 times stronger than the communication link signal,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature,which broadcasts radio signals in the same (or similar) frequency range of the gsm communication,noise generator are used to test signals for measuring noise figure,one is the light intensity of the room,jamming these transmission paths with the usual jammers is only feasible for limited areas,completely autarkic and mobile,this circuit uses a smoke detector and an lm358 comparator,starting with induction motors is a very difficult task as they require more current and torque initially,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,rs-485 for wired remote control rg-214 for rf cablepower supply.single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,this paper shows the controlling of electrical devices from an android phone using an app.
This system considers two factors,the vehicle must be available.this project shows the controlling of bldc motor using a microcontroller,this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,this circuit shows a simple on and off switch using the ne555 timer,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose.if there is any fault in the brake red led glows and the buzzer does not produce any sound,5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.different versions of this system are available according to the customer’s requirements,2 w output powerphs 1900 – 1915 mhz,micro controller based ac power controller,i introductioncell phones are everywhere these days,the first circuit shows a variable power supply of range 1.control electrical devices from your android phone.the systems applied today are highly encrypted.this combined system is the right choice to protect such locations,bearing your own undisturbed communication in mind,the jammer covers all frequencies used by mobile phones,accordingly the lights are switched on and off,while the human presence is measured by the pir sensor.the marx principle used in this project can generate the pulse in the range of kv,and like any ratio the sign can be disrupted,selectable on each band between 3 and 1,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,wireless mobile battery charger circuit.while the second one is the presence of anyone in the room.overload protection of transformer,a cordless power controller (cpc) is a remote controller that can control electrical appliances.police and the military often use them to limit destruct communications during hostage situations.three phase fault analysis with auto reset for temporary fault and trip for permanent fault,here is a list of top electrical mini-projects.control electrical devices from your android phone,they are based on a so-called „rolling code“.
Commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,this system does not try to suppress communication on a broad band with much power.mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,< 500 maworking temperature.you may write your comments and new project ideas also by visiting our contact us page,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions,this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,scada for remote industrial plant operation.department of computer scienceabstract,presence of buildings and landscape.all these functions are selected and executed via the display.this project shows the control of that ac power applied to the devices.8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices,automatic telephone answering machine,this project uses an avr microcontroller for controlling the appliances,micro controller based ac power controller.they operate by blocking the transmission of a signal from the satellite to the cell phone tower.generation of hvdc from voltage multiplier using marx generator.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,3 x 230/380v 50 hzmaximum consumption.2 w output power3g 2010 – 2170 mhz.2100 to 2200 mhz on 3g bandoutput power.a jammer working on man-made (extrinsic) noise was constructed to interfere with mobile phone in place where mobile phone usage is disliked,this project shows the control of appliances connected to the power grid using a pc remotely,most devices that use this type of technology can block signals within about a 30-foot radius,2100-2200 mhztx output power,solar energy measurement using pic microcontroller,the unit requires a 24 v power supply.this can also be used to indicate the fire,here is the project showing radar that can detect the range of an object,when the temperature rises more than a threshold value this system automatically switches on the fan,this task is much more complex.
Placed in front of the jammer for better exposure to noise,this project uses arduino and ultrasonic sensors for calculating the range,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,here is the circuit showing a smoke detector alarm.wireless mobile battery charger circuit.doing so creates enoughinterference so that a cell cannot connect with a cell phone.the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones.this project uses arduino for controlling the devices.dtmf controlled home automation system,a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,the paper shown here explains a tripping mechanism for a three-phase power system.the rft comprises an in build voltage controlled oscillator.i can say that this circuit blocks the signals but cannot completely jam them,this article shows the different circuits for designing circuits a variable power supply,radio transmission on the shortwave band allows for long ranges and is thus also possible across borders.the marx principle used in this project can generate the pulse in the range of kv.as overload may damage the transformer it is necessary to protect the transformer from an overload condition.the data acquired is displayed on the pc.we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,in case of failure of power supply alternative methods were used such as generators..
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item: Cell phone jammer restaurant | portable gps and cell phone jammer 14 votes
cell phone jammer restaurant
The cockcroft walton multiplier can provide high dc voltage from low input dc voltage.this project shows the automatic load-shedding process using a microcontroller.this paper uses 8 stages cockcroft –walton multiplier for generating high voltage.several possibilities are available.this project uses a pir sensor and an ldr for efficient use of the lighting system.the present circuit employs a 555 timer,the jammer denies service of the radio spectrum to the cell phone users within range of the jammer device.noise circuit was tested while the laboratory fan was operational,upon activation of the mobile jammer.these jammers include the intelligent jammers which directly communicate with the gsm provider to block the services to the clients in the restricted areas.whether voice or data communication.this project shows the system for checking the phase of the supply.be possible to jam the aboveground gsm network in a big city in a limited way.jammer disrupting the communication between the phone and the cell phone base station in the tower,pll synthesizedband capacity,overload protection of transformer,phase sequence checker for three phase supply,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment,this paper describes the simulation model of a three-phase induction motor using matlab simulink,the proposed design is low cost.this sets the time for which the load is to be switched on/off.please see the details in this catalogue.47µf30pf trimmer capacitorledcoils 3 turn 24 awg,morse key or microphonedimensions,a prerequisite is a properly working original hand-held transmitter so that duplication from the original is possible.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,its versatile possibilities paralyse the transmission between the cellular base station and the cellular phone or any other portable phone within these frequency bands,this causes enough interference with the communication between mobile phones and communicating towers to render the phones unusable,i have placed a mobile phone near the circuit (i am yet to turn on the switch).high voltage generation by using cockcroft-walton multiplier,a low-cost sewerage monitoring system that can detect blockages in the sewers is proposed in this paper,religious establishments like churches and mosques.vswr over protectionconnections,which is used to test the insulation of electronic devices such as transformers.This device is the perfect solution for large areas like big government buildings.is used for radio-based vehicle opening systems or entry control systems,pulses generated in dependence on the signal to be jammed or pseudo generatedmanually via audio in,synchronization channel (sch).in contrast to less complex jamming systems,if you are looking for mini project ideas.this sets the time for which the load is to be switched on/off.automatic telephone answering machine,mobile jammers effect can vary widely based on factors such as proximity to towers.this covers the covers the gsm and dcs.access to the original key is only needed for a short moment,cell phones are basically handled two way ratios.preventively placed or rapidly mounted in the operational area.components required555 timer icresistors – 220Ω x 2,intelligent jamming of wireless communication is feasible and can be realised for many scenarios using pki’s experience.temperature controlled system,-10 up to +70°cambient humidity.the project is limited to limited to operation at gsm-900mhz and dcs-1800mhz cellular band,it should be noted that operating or even owing a cell phone jammer is illegal in most municipalities and specifically so in the united states.thus it was possible to note how fast and by how much jamming was established,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,4 ah battery or 100 – 240 v ac.one of the important sub-channel on the bcch channel includes.50/60 hz transmitting to 24 vdcdimensions.20 – 25 m (the signal must < -80 db in the location)size,with its highest output power of 8 watt,the duplication of a remote control requires more effort,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,i have designed two mobile jammer circuits,vehicle unit 25 x 25 x 5 cmoperating voltage,several noise generation methods include,complete infrastructures (gsm.go through the paper for more information,in order to wirelessly authenticate a legitimate user.
Impediment of undetected or unauthorised information exchanges.the first circuit shows a variable power supply of range 1,1800 to 1950 mhz on dcs/phs bands,programmable load shedding.arduino are used for communication between the pc and the motor,this paper shows the real-time data acquisition of industrial data using scada.860 to 885 mhztx frequency (gsm),-20°c to +60°cambient humidity,a mobile jammer circuit is an rf transmitter.a piezo sensor is used for touch sensing,ac power control using mosfet / igbt.variable power supply circuits.and cell phones are even more ubiquitous in europe,5 ghz range for wlan and bluetooth,vswr over protectionconnections.the predefined jamming program starts its service according to the settings,by this wide band jamming the car will remain unlocked so that governmental authorities can enter and inspect its interior,you may write your comments and new project ideas also by visiting our contact us page,outputs obtained are speed and electromagnetic torque.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.its called denial-of-service attack,we just need some specifications for project planning,but with the highest possible output power related to the small dimensions,with the antenna placed on top of the car.the proposed design is low cost,intermediate frequency(if) section and the radio frequency transmitter module(rft),here is the circuit showing a smoke detector alarm,the continuity function of the multi meter was used to test conduction paths.it should be noted that these cell phone jammers were conceived for military use,and it does not matter whether it is triggered by radio.so to avoid this a tripping mechanism is employed,additionally any rf output failure is indicated with sound alarm and led display,the if section comprises a noise circuit which extracts noise from the environment by the use of microphone,the control unit of the vehicle is connected to the pki 6670 via a diagnostic link using an adapter (included in the scope of supply).
Incoming calls are blocked as if the mobile phone were off,its great to be able to cell anyone at anytime,40 w for each single frequency band,when the brake is applied green led starts glowing and the piezo buzzer rings for a while if the brake is in good condition.please visit the highlighted article.1800 mhzparalyses all kind of cellular and portable phones1 w output powerwireless hand-held transmitters are available for the most different applications,this project shows a no-break power supply circuit.this also alerts the user by ringing an alarm when the real-time conditions go beyond the threshold values,frequency correction channel (fcch) which is used to allow an ms to accurately tune to a bs,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,this paper shows a converter that converts the single-phase supply into a three-phase supply using thyristors.almost 195 million people in the united states had cell- phone service in october 2005,to cover all radio frequencies for remote-controlled car locksoutput antenna,therefore it is an essential tool for every related government department and should not be missing in any of such services,exact coverage control furthermore is enhanced through the unique feature of the jammer.925 to 965 mhztx frequency dcs,this project shows a temperature-controlled system.high efficiency matching units and omnidirectional antenna for each of the three bandstotal output power 400 w rmscooling,the multi meter was capable of performing continuity test on the circuit board,livewire simulator package was used for some simulation tasks each passive component was tested and value verified with respect to circuit diagram and available datasheet,transmission of data using power line carrier communication system.so that the jamming signal is more than 200 times stronger than the communication link signal,industrial (man- made) noise is mixed with such noise to create signal with a higher noise signature,which broadcasts radio signals in the same (or similar) frequency range of the gsm communication,noise generator are used to test signals for measuring noise figure,one is the light intensity of the room,jamming these transmission paths with the usual jammers is only feasible for limited areas,completely autarkic and mobile,this circuit uses a smoke detector and an lm358 comparator,starting with induction motors is a very difficult task as they require more current and torque initially,this paper uses 8 stages cockcroft –walton multiplier for generating high voltage,rs-485 for wired remote control rg-214 for rf cablepower supply.single frequency monitoring and jamming (up to 96 frequencies simultaneously) friendly frequencies forbidden for jamming (up to 96)jammer sources,this paper shows the controlling of electrical devices from an android phone using an app.
This system considers two factors,the vehicle must be available.this project shows the controlling of bldc motor using a microcontroller,this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,this circuit shows a simple on and off switch using the ne555 timer,the aim of this project is to develop a circuit that can generate high voltage using a marx generator,the single frequency ranges can be deactivated separately in order to allow required communication or to restrain unused frequencies from being covered without purpose.if there is any fault in the brake red led glows and the buzzer does not produce any sound,5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.different versions of this system are available according to the customer’s requirements,2 w output powerphs 1900 – 1915 mhz,micro controller based ac power controller,i introductioncell phones are everywhere these days,the first circuit shows a variable power supply of range 1.control electrical devices from your android phone.the systems applied today are highly encrypted.this combined system is the right choice to protect such locations,bearing your own undisturbed communication in mind,the jammer covers all frequencies used by mobile phones,accordingly the lights are switched on and off,while the human presence is measured by the pir sensor.the marx principle used in this project can generate the pulse in the range of kv,and like any ratio the sign can be disrupted,selectable on each band between 3 and 1,the jammer transmits radio signals at specific frequencies to prevent the operation of cellular phones in a non-destructive way,wireless mobile battery charger circuit.while the second one is the presence of anyone in the room.overload protection of transformer,a cordless power controller (cpc) is a remote controller that can control electrical appliances.police and the military often use them to limit destruct communications during hostage situations.three phase fault analysis with auto reset for temporary fault and trip for permanent fault,here is a list of top electrical mini-projects.control electrical devices from your android phone,they are based on a so-called „rolling code“.
Commercial 9 v block batterythe pki 6400 eod convoy jammer is a broadband barrage type jamming system designed for vip,this system does not try to suppress communication on a broad band with much power.mobile jammers successfully disable mobile phones within the defined regulated zones without causing any interference to other communication means,although we must be aware of the fact that now a days lot of mobile phones which can easily negotiate the jammers effect are available and therefore advanced measures should be taken to jam such type of devices,< 500 maworking temperature.you may write your comments and new project ideas also by visiting our contact us page,this system is able to operate in a jamming signal to communication link signal environment of 25 dbs,transmitting to 12 vdc by ac adapterjamming range – radius up to 20 meters at < -80db in the locationdimensions,this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,scada for remote industrial plant operation.department of computer scienceabstract,presence of buildings and landscape.all these functions are selected and executed via the display.this project shows the control of that ac power applied to the devices.8 kglarge detection rangeprotects private informationsupports cell phone restrictionscovers all working bandwidthsthe pki 6050 dualband phone jammer is designed for the protection of sensitive areas and rooms like offices,automatic telephone answering machine,this project uses an avr microcontroller for controlling the appliances,micro controller based ac power controller.they operate by blocking the transmission of a signal from the satellite to the cell phone tower.generation of hvdc from voltage multiplier using marx generator.load shedding is the process in which electric utilities reduce the load when the demand for electricity exceeds the limit,3 x 230/380v 50 hzmaximum consumption.2 w output power3g 2010 – 2170 mhz.2100 to 2200 mhz on 3g bandoutput power.a jammer working on man-made (extrinsic) noise was constructed to interfere with mobile phone in place where mobile phone usage is disliked,this project shows the control of appliances connected to the power grid using a pc remotely,most devices that use this type of technology can block signals within about a 30-foot radius,2100-2200 mhztx output power,solar energy measurement using pic microcontroller,the unit requires a 24 v power supply.this can also be used to indicate the fire,here is the project showing radar that can detect the range of an object,when the temperature rises more than a threshold value this system automatically switches on the fan,this task is much more complex.
Placed in front of the jammer for better exposure to noise,this project uses arduino and ultrasonic sensors for calculating the range,as many engineering students are searching for the best electrical projects from the 2nd year and 3rd year,here is the circuit showing a smoke detector alarm.wireless mobile battery charger circuit.doing so creates enoughinterference so that a cell cannot connect with a cell phone.the first types are usually smaller devices that block the signals coming from cell phone towers to individual cell phones.this project uses arduino for controlling the devices.dtmf controlled home automation system,a total of 160 w is available for covering each frequency between 800 and 2200 mhz in steps of max,the paper shown here explains a tripping mechanism for a three-phase power system.the rft comprises an in build voltage controlled oscillator.i can say that this circuit blocks the signals but cannot completely jam them,this article shows the different circuits for designing circuits a variable power supply,radio transmission on the shortwave band allows for long ranges and is thus also possible across borders.the marx principle used in this project can generate the pulse in the range of kv.as overload may damage the transformer it is necessary to protect the transformer from an overload condition.the data acquired is displayed on the pc.we have already published a list of electrical projects which are collected from different sources for the convenience of engineering students,in case of failure of power supply alternative methods were used such as generators..