Phone as jammer reviews | phone as jammer gun

The Universal Software Radio Peripheral as RF Front-End By Ningyan Guo, Staffan Backén, and Dennis Akos The authors designed a full-constellation GNSS receiver, using a cost-effective, readily available, flexible front-end, wide enough to capture the frequency from 1555 MHz to 1607 MHz, more than 50MHz. This spectrum width takes into account BeiDou E2, Galileo E1, GPS L1, and GLONASS G1. In the course of their development, the authors used an external OCXO oscillator as the reference clock and reconfigured the platform, developing their own custom wide-band firmware. The development of the Galileo and BeiDou constellations will make many more GNSS satellite measurements be available in the near future. Multiple constellations offer wide-area signal coverage and enhanced signal redundancy. Therefore, a wide-band multi-constellation receiver can typically improve GNSS navigation performance in terms of accuracy, continuity, availability, and reliability. Establishing such a wide-band multi-constellation receiver was the motivation for this research. A typical GNSS receiver consists of three parts: RF front-end, signal demodulation, and generation of navigation information. The RF front-end mainly focuses on amplifying the input RF signals, down-converting them to an intermediate frequency (IF), and filtering out-of-band signals. Traditional hardware-based receivers commonly use application-specific integrated circuit (ASIC) units to fulfill signal demodulation and transfer the range and carrier phase measurements to the navigation generating part, which is generally implemented in software. Conversely, software-based receivers typically implement these two functions through software. In comparison to a hardware-based receiver, a software receiver provides more flexibility and supplies more complex signal processing algorithms. Therefore, software receivers are increasingly popular for research and development. The frequency coverage range, amplifier performance, filters, and mixer properties of the RF front-end will determine the whole realization of the GNSS receiver. A variety of RF front-end implementations have emerged during the past decade. Real down-conversion multi-stage IF front-end architecture typically amplifies filters and mixes RF signals through several stages in order to get the baseband signals. However, real down-conversion can bring image-folding and rejection. To avoid these drawbacks, complex down-conversion appears to resolve much of these problems. Therefore, a complex down-conversion multi-stage IF front-end has been developed. But it requires a high-cost, high-power supply, and is larger for a multi-stage IF front-end. This shortcoming is overcome by a direct down-conversion architecture. This front-end has lower cost; but there are several disadvantages with direct down-conversion, such as DC offset and I/Q mismatch. DC offset is caused by local oscillation (LO) leakage reflected from the front-end circuit, the antenna, and the receiver external environment. A comparison of current traditional RF front-ends and different RF front-end implementation types led us to the conclusion that one model of a universal software radio peripheral, the USRP N210, would make an appropriate RF front end option. USRP N210 utilizes a low-IF complex direct down-conversion architecture that has several favorable properties, enabling developers to build a wide range of RF reception systems with relatively low cost and effort. It also offers high-speed signal processing. Most importantly, the source code of USRP firmware is open to all users, enabling researchers to rapidly design and implement powerful, flexible, reconfigurable software radio systems. Therefore, we chose the USRP N210 as our reception device to develop our wide-band multi-constellation GNSS receiver, shown in Figure 1. Figure 1. Custom wide-band multi-constellation software receiver architecture based on universal software radio peripheral (USRP). USRP Front-End Architecture The USRP N210 front-end has wider band-width and radio frequency coverage in contrast with other traditional front-ends as shown by the comparison in Table 1. It has the potential to implement multiple frequencies and multiple-constellation GNSS signal reception. Moreover, it performs higher quantization, and the onboard Ethernet interface offers high-speed data transfer. Table 1. GNSS front-ends comparison. USRP N210 is based on the direct low-IF complex down-conversion receiver architecture that is a combination of the traditional analog complex down-conversion implemented on daughter boards and the digital signal conditioning conducted in the motherboard. Some studies have shown that the low-IF complex down-conversion receiver architecture overcomes some of the well-known issues associated with real down-conversion super heterodyne receiver architecture and direct IF down-conversion receiver architecture, such as high cost, image-folding, DC offset, and I/Q mismatch. The low-IF receiver architecture effectively lessens the DC offset by having an LO frequency after analog complex down-conversion. The first step uses a direct complex down-conversion scheme to transform the input RF signal into a low-IF signal. The filters located after the mixer are centered at the low-IF to filter out the unwanted signals. The second step is to further down-covert the low-IF signal to baseband, or digital complex down-conversion. Similar to the first stage, a digital half band filter has been developed to filter out-of-band interference. Therefore, direct down-conversion instead of multi-stage IF down-conversion overcomes the cost problem; in the meantime, the signal is down-converted to low-IF instead of base-band frequency as in the direct down-conversion receiver, so the problem of the DC offset is also avoided in the low-IF receiver. These advantages make the USRP N210 platform an attractive option as GNSS receiver front-end. Figure 2 shows an example GNSS signal-streaming path schematic on a USRP N210 platform with a DBSRX2 daughter board. Figure 3 shows a photograph of internal structure of a USRP N210 platform. Figure 2 GNSS signal streaming on USRP N210 + DBSRX2 circuit. Figure 3. USRP N210 internal structure. The USRP N210 platform includes a main board and a daughterboard. In the main board, 14-bit high precision analog-digital converters (ADCs) and digital-analog converters (DACs) permit wide-band signals covering a high dynamic range. The core of the main board is a high-speed field-programmable gate array (FPGA) that allows high-speed signal processing. The FPGA configuration implements down-conversion of the baseband signals to a zero center frequency, decimates the sampled signals, filtering out-of-band components, and finally transmits them through a packet router to the Ethernet port. The onboard numerically controlled oscillator generates the digital sinusoid used by the digital down-conversion process. A cascaded integrator-comb (CIC) filter serves as decimator to down-sample the signal. The signals are filtered by a half pass filter for rejecting the out-of-band signals. A Gigabit Ethernet interface effectively enables the delivery of signals out of the USRP N210, up to 25MHz of RF bandwidth. In the daughterboard, first the RF signals are amplified, then the signals are mixed by a local onboard oscillator according to a complex down-conversion scheme. Finally, a band-pass filter is used remove the out-of-band signals. Several available daughter boards can perform signal conditioning and tuning implementation. It is important to choose an appropriate daughter board, given the requirements for the data collection. A support driver called Universal Hardware Driver (UHD) for the USRP hardware, under Linux, Windows and Mac OS X, is an open-source driver that contains many convenient assembly tools. To boot and configure the whole system, the on-board microprocessor digital signal processor (DSP) needs firmware, and the FPGA requires images. Firmware and FPGA images are downloaded into the USRP platform based on utilizations provided by the UHD. Regarding the source of firmware and FPGA images, there are two methods to obtain them:   directly use the binary release firmware and images posted on the web site of the company;   build (and potentially modify) the provided source code. USRP Testing and Implementation Some essential testing based on the original configuration of the USRP N210 platform provided an understanding of its architecture, which was necessary to reconfigure its firmware and to set up the wide-band, multi-constellation GNSS receiver. We collected some real GPS L1 data with the USRP N210 as RF front-end. When we processed these GPS L1 data using a software-defined radio (SDR), we encountered a major issue related to tracking, described in the following section. Onboard Oscillator Testing. A major problem with the USRP N210 is that its internal temperature-controlled crystal oscillator (TCXO) is not stable in terms of frequency. To evaluate this issue, we recorded some real GPS L1 data and processed the data with our software receiver. As shown in Figure 4, this issue results in the loss of GPS carrier tracking loop at 3.18 seconds, when the carrier loop bandwidth is 25Hz. Figure 4. GPS carrier loop loss of lock. Consequently, we adjusted the carrier loop bandwidth up to 100Hz; then GPS carrier tracking is locked at the same timing (3.18s), shown in Figure 5, but there is an almost 200 Hz jump in less than 5 milliseconds. Figure 5. GPS carrier loop lock tracking. As noted earlier, the daughter card of the USRP N210 platform utilizes direct IF complex down-conversion to tune GNSS RF signals. The oscillator of the daughter board generates a sinusoid signal that serves as mixer to down-convert input GNSS RF signals to a low IF signal. Figure 6 illustrates the daughter card implementation. The drawback of this architecture is that it may bring in an extra frequency shift by the unstable oscillator. The configuration of the daughter-card oscillator is implemented by an internal TCXO clock, which is on the motherboard. Unfortunately, the internal TCXO clock has coarse resolution in terms of frequency adjustments. This extra frequency offset multiplies the corresponding factor that eventually provides mixer functionality to the daughter card. This approach can directly lead to a large frequency offset to the mixer, which is brought into the IF signals. Figure 6. Daughter-card tuning implementation. Finally, when we conduct the tracking operation through the software receiver, this large frequency offset is beyond the lock range of a narrow, typically desirable, GNSS carrier tracking loop, as shown in Figure 4. In general, a TCXO is preferred when size and power are critical to the application. An oven-controlled crystal oscillator (OCXO) is a more robust product in terms of frequency stability with varying temperature. Therefore, for the USRP N210 onboard oscillator issue, it is favorable to use a high-quality external OCXO as the basic reference clock when using USRP N210 for GNSS applications. Front-End Daughter-Card Options. A variety of daughter-card options exist to amplify, mix, and filter RF signals. Table 2 lists comparison results of three daughter cards (BURX, DBSRX and DBSRX2) to supply some guidance to researchers when they are faced with choosing the correct daughter-board. Table 2. Front-end daughter-card options. The three daughter cards have diverse properties, such as the primary ASIC, frequency coverage range, filter bandwidth and adjustable gain. BURX gives wider radio frequency coverage than DBSRX and DBSRX2. DBSRX2 offers the widest filter bandwidth among the three options. To better compare the performance of the three daughter cards, we conducted another three experiments. In the first, we directly connected the RF port with a terminator on the USRP N210 platform to evaluate the noise figure on the three daughter cards. From Figure 7, we can draw some conclusions: BURX has a better sensitivity than DBSRX and DBSRX2 when the gain is set below 30dB. DBSRX2 observes feedback oscillation when the gain set is higher than 70dB. Figure 7. Noise performance comparisons of three daughter cards. The second experimental setup configuration used a USRP N210 platform, an external OCXO oscillator to provide stable reference clock, and a GPS simulator to evaluate the C/N0 performance of the three daughter boards. The input RF signals are identical, as they come from the same configuration of the GPS simulator. Figure 8 illustrates the C/N0 performance comparison based on this experimental configuration. The figure shows that BURX performs best, with DBSRX2 just slightly behind, while DBSRX has a noise figure penalty of 4dB. Figure 8. C/N0 performance comparisons of three daughter cards. In the third experiment, we added an external amplifier to increase the signal-to-noise ratio (SNR). From Figure 9, we see that the BURX, DBSRX and DBSRX2 have the same C/N0 performance, effectively validating the above conclusion. Thus, an external amplifier is recommended when using the DBSRX or DBSRX2 daughter boards. Figure 9. C/N0 performance comparisons of three daughter cards with an external amplifier. The purpose of these experiments was to find a suitable daughter board for collecting wide-band multi-constellation GNSS RF signals. The important qualities of an appropriate wide-band multi-constellation GNSS receiver are: high sensitivity; wide filter bandwidth; and wide frequency range. After a comparison of the three daughter boards, we found that the BURX has a better noise figure than the DBSRX or DBSRX2. The overall performance of the BURX and DBSRX2 are similar however. Using an external amplifier effectively decreases the required gain on all three daughter cards, which correspondingly reduces the effect of the internal thermal noise and enhances the signal noise ratio. As a result, when collecting real wide-band multi-constellation GNSS RF signals, it is preferable to use an external amplifier. To consider recording GNSS signals across a 50MHz band, DBSRX2 provides the wider filter bandwidth among the three daughter-card options, and thus we selected it as a suitable daughter card. Custom Wide-band Firmware Development. When initially implementing the wideband multi-constellation GNSS reception devices based on the USRP N210 platform, we found a shortcoming in the default configuration of this architecture, whose maximum bandwidth is 25MHz. It is not wide enough to record 50MHz multi-constellation GNSS signals (BeiDou E2, GPS L1, Galileo E1, and GlonassG1). A 50MHz sampling rate (in some cases as much as 80 MHz) is needed to demodulate the GNSS satellites’ signals. Meanwhile since the initiation of the research, the USRP manufacturer developed and released a 50MHz firmware. To highlight our efforts, we further modified the USRP N210 default configuration to increase the bandwidth up to 100MHz, which has the potential to synchronously record multi-constellation multi-frequency GNSS signals (Galileo E5a and E5b, GPS L5 and L2) for further investigation of other multi-constellation applications, such as ionospheric dispersion within wideband GNSS signals, or multi-constellation GNSS radio frequency compatibility and interoperability. Apart from reprogramming the host driver, we focused on reconfiguring the FPGA firmware. With the aid of anatomizing signal flow in the FPGA, we obtained a particular realization method of augmenting its bandwidth. Figure 10 shows the signal flow in the FPGA of the USRP N210 architecture. Figure 10. Signal flow in the FPGA of the USRP N210 platform. The ADC produces 14-bit sampled data. After the digital down-conversion implementation in the FPGA, 16-bit complex I/Q sample data are available for the packet transmitting step. According to the induction document of the USRP N210 platform, VITA Radio Transport Protocol functions as an overall framework in the FPGA to provide data transmission and to implement an infrastructure that maintains sample-accurate alignment of signal data. After significant processing in the VITA chain, 36-bit data is finally given to the packet router. The main function of the packet router is to transfer sample data without any data transformation. Finally, through the Gigabit Ethernet port, the host PC receives the complex sample data. In an effort to widen the bandwidth of the USRP N210 platform, the bit depth needs to be reduced, which cuts 16-bit complex I/Q sample data to a smaller length, such as 8-bit, 4-bit, or even 2-bit, to solve the problem. By analyzing Figure 10, to fulfill the project’s demanding requirements, modification to the data should be performed after ADC sampling, but before the digital down-conversion. We directly extract the 4-bit most significant bits (MSBs) from the ADC sampling data and combined eight 4-bit MSB into a new 16-bit complex I/Q sample, and gave this custom sample data to the packet router, increasing the bandwidth to 100 MHz. Wide-Band Receiver Performance Analysis. The custom USRP N210-based wide-band multi-constellation GNSS data reception experiment is set up as shown in Figure 11. Figure 11. Wide-band multi-constellation GNSS data recording system. A wide-band antenna collected the raw GNSS data, including GPS, GLONASS, Galileo, and BeiDou. An external amplifier was included to decrease the overall noise figure. An OCXO clock was used as the reference clock of the USRP N210 system. After we found the times when Galileo and BeiDou satellites were visible from our location, we first tested the antenna and external amplifier using a commercial receiver, which provided a reference position. Then we used 1582MHz as the reception center frequency and issued the corresponding command on the host computer to start collecting the raw wide-band GNSS signals. By processing the raw wide-band GNSS data through our software receiver, we obtained the acquisition results from all constellations shown in Figure 12; and tracking results displayed in Figure 13. Figure 12. Acquisition results for all constellations. Figure 13. Tracking results for all constellations. We could not do the full-constellation position solution because Galileo was not broadcasting navigation data at the time of the collection and the ICD for BeiDou had not yet been released. Therefore, respectively using GPS and GLONASS tracking results, we provided the position solution and timing information that are illustrated in Figure 14 and in Figure 15. Figure 14. GPS position solution and timing information. Figure 15. GLONASS position solution. Conclusions By processing raw wide-band multi-constellation GNSS signals through our software receiver, we successfully acquired and tracked satellites from the four constellations. In addition, since we achieved 100MHz bandwidth, we can also simultaneously capture modernized GPS and Galileo signals (L5 and L2; E5a and E5b, 1105–1205 MHz). In future work, a longer raw wide-band GNSS data set will be recorded and used to determine the user position leveraging all constellations. Also an urban collection test will be done to assess/demonstrate that multiple constellations can effectively improve the reliability and continuity of GNSS navigation. Acknowledgment The first author’s visiting stay to conduct her research at University of Colorado is funded by China Scholarship Council, File No. 2010602084. This article is based on a paper presented at the Institute of Navigation International Technical Conference 2013 in San Diego, California. Manufacturers The USRP N210 is manufactured by Ettus Research. The core of the main board is a high-speed Xilinx Spartan 3A DSP FPGA. Ettus Research provides a support driver called Universal Hardware Driver (UHD) for the USRP hardware. A wide-band Trimble antenna was used in the final experiment. Ningyan Guo is a Ph.D. candidate at Beihang University, China. She is currently a visiting scholar at the University of Colorado at Boulder. Staffan Backén is a postdoctoral researcher at University of Colorado at Boulder. He received a Ph.D. in in electrical engineering from Luleå University of Technology, Sweden. Dennis Akos completed a Ph.D. in electrical engineering at Ohio University. He is an associate professor in the Aerospace Engineering Sciences Department at the University of Colorado at Boulder with visiting appointments at Luleå University of Technology and Stanford University

phone as jammer reviews

When the mobile jammer is turned off,power supply unit was used to supply regulated and variable power to the circuitry during testing,this system also records the message if the user wants to leave any message,theatres and any other public places,the electrical substations may have some faults which may damage the power system equipment,this allows a much wider jamming range inside government buildings,while the human presence is measured by the pir sensor.access to the original key is only needed for a short moment,doing so creates enoughinterference so that a cell cannot connect with a cell phone,religious establishments like churches and mosques,with the antenna placed on top of the car,due to the high total output power.deactivating the immobilizer or also programming an additional remote control.the proposed system is capable of answering the calls through a pre-recorded voice message,the continuity function of the multi meter was used to test conduction paths.ac 110-240 v / 50-60 hz or dc 20 – 28 v / 35-40 ahdimensions.the pki 6400 is normally installed in the boot of a car with antennas mounted on top of the rear wings or on the roof,arduino are used for communication between the pc and the motor.transmission of data using power line carrier communication system,solar energy measurement using pic microcontroller,although industrial noise is random and unpredictable.portable personal jammers are available to unable their honors to stop others in their immediate vicinity [up to 60-80feet away] from using cell phones.cpc can be connected to the telephone lines and appliances can be controlled easily,a user-friendly software assumes the entire control of the jammer.here is a list of top electrical mini-projects.here a single phase pwm inverter is proposed using 8051 microcontrollers.military camps and public places.the data acquired is displayed on the pc.this project shows a no-break power supply circuit.noise generator are used to test signals for measuring noise figure.the systems applied today are highly encrypted,a spatial diversity setting would be preferred.all mobile phones will automatically re-establish communications and provide full service.-20°c to +60°cambient humidity,this project uses a pir sensor and an ldr for efficient use of the lighting system,as overload may damage the transformer it is necessary to protect the transformer from an overload condition,this jammer jams the downlinks frequencies of the global mobile communication band- gsm900 mhz and the digital cellular band-dcs 1800mhz using noise extracted from the environment,a piezo sensor is used for touch sensing,the common factors that affect cellular reception include,the circuit shown here gives an early warning if the brake of the vehicle fails.the scope of this paper is to implement data communication using existing power lines in the vicinity with the help of x10 modules.the rating of electrical appliances determines the power utilized by them to work properly,accordingly the lights are switched on and off,this circuit shows a simple on and off switch using the ne555 timer.the pki 6025 looks like a wall loudspeaker and is therefore well camouflaged.

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Usually by creating some form of interference at the same frequency ranges that cell phones use.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,while most of us grumble and move on,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.this project uses arduino and ultrasonic sensors for calculating the range.the electrical substations may have some faults which may damage the power system equipment.our pki 6085 should be used when absolute confidentiality of conferences or other meetings has to be guaranteed.this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs.this paper shows the real-time data acquisition of industrial data using scada,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.5 kgadvanced modelhigher output powersmall sizecovers multiple frequency band,the proposed design is low cost.it can be placed in car-parks,this article shows the different circuits for designing circuits a variable power supply,110 to 240 vac / 5 amppower consumption.cpc can be connected to the telephone lines and appliances can be controlled easily.please visit the highlighted article,be possible to jam the aboveground gsm network in a big city in a limited way,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,for such a case you can use the pki 6660,40 w for each single frequency band,pki 6200 looks through the mobile phone signals and automatically activates the jamming device to break the communication when needed.scada for remote industrial plant operation,i have placed a mobile phone near the circuit (i am yet to turn on the switch),an antenna radiates the jamming signal to space,this project shows the control of home appliances using dtmf technology,this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating,in case of failure of power supply alternative methods were used such as generators.overload protection of transformer,all the tx frequencies are covered by down link only,2 to 30v with 1 ampere of current.vi simple circuit diagramvii working of mobile jammercell phone jammer work in a similar way to radio jammers by sending out the same radio frequencies that cell phone operates on,almost 195 million people in the united states had cell- phone service in october 2005,the rf cellular transmitted module with frequency in the range 800-2100mhz,iv methodologya noise generator is a circuit that produces electrical noise (random,when the temperature rises more than a threshold value this system automatically switches on the fan,so to avoid this a tripping mechanism is employed,generation of hvdc from voltage multiplier using marx generator,which broadcasts radio signals in the same (or similar) frequency range of the gsm communication.dean liptak getting in hot water for blocking cell phone signals,this device is the perfect solution for large areas like big government buildings,communication system technology use a technique known as frequency division duple xing (fdd) to serve users with a frequency pair that carries information at the uplink and downlink without interference.2100 to 2200 mhz on 3g bandoutput power,the circuit shown here gives an early warning if the brake of the vehicle fails.

The present circuit employs a 555 timer.iii relevant concepts and principlesthe broadcast control channel (bcch) is one of the logical channels of the gsm system it continually broadcasts,a break in either uplink or downlink transmission result into failure of the communication link,completely autarkic and mobile.the rft comprises an in build voltage controlled oscillator,shopping malls and churches all suffer from the spread of cell phones because not all cell phone users know when to stop talking.this was done with the aid of the multi meter.this system uses a wireless sensor network based on zigbee to collect the data and transfers it to the control room,cyclically repeated list (thus the designation rolling code),gsm 1800 – 1900 mhz dcs/phspower supply.temperature controlled system,the whole system is powered by an integrated rechargeable battery with external charger or directly from 12 vdc car battery,bearing your own undisturbed communication in mind,pc based pwm speed control of dc motor system,which is used to provide tdma frame oriented synchronization data to a ms,whether voice or data communication.check your local laws before using such devices.please see the details in this catalogue,similar to our other devices out of our range of cellular phone jammers,cell phone jammers have both benign and malicious uses,so that we can work out the best possible solution for your special requirements,we hope this list of electrical mini project ideas is more helpful for many engineering students,the zener diode avalanche serves the noise requirement when jammer is used in an extremely silet environment.the operating range is optimised by the used technology and provides for maximum jamming efficiency,exact coverage control furthermore is enhanced through the unique feature of the jammer.pulses generated in dependence on the signal to be jammed or pseudo generatedmanually via audio in,programmable load shedding.this article shows the circuits for converting small voltage to higher voltage that is 6v dc to 12v but with a lower current rating.the inputs given to this are the power source and load 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,nothing more than a key blank and a set of warding files were necessary to copy a car key,this project uses arduino for controlling the devices,you can control the entire wireless communication using this system.the rf cellulartransmitter module with 0,this project shows the automatic load-shedding process using a microcontroller.860 to 885 mhztx frequency (gsm).< 500 maworking temperature.50/60 hz transmitting to 12 v dcoperating time.this system considers two factors,conversion of single phase to three phase supply,several possibilities are available.this project shows the measuring of solar energy using pic microcontroller and sensors,armoured systems are available,the unit is controlled via a wired remote control box which contains the master on/off switch,law-courts and banks or government and military areas where usually a high level of cellular base station signals is emitted.

Vswr over protectionconnections.several noise generation methods include.auto no break power supply control.are suitable means of camouflaging,whenever a car is parked and the driver uses the car key in order to lock the doors by remote control.15 to 30 metersjamming control (detection first).one is the light intensity of the room.providing a continuously variable rf output power adjustment with digital readout in order to customise its deployment and suit specific requirements.wireless mobile battery charger circuit.soft starter for 3 phase induction motor using microcontroller,this project uses arduino for controlling the devices.provided there is no hand over,this can also be used to indicate the fire,a mobile phone jammer prevents communication with a mobile station or user equipment by transmitting an interference signal at the same frequency of communication between a mobile stations a base transceiver station.this combined system is the right choice to protect such locations,the predefined jamming program starts its service according to the settings.the paper shown here explains a tripping mechanism for a three-phase power system,phase sequence checking is very important in the 3 phase supply.the jamming frequency to be selected as well as the type of jamming is controlled in a fully automated way,outputs obtained are speed and electromagnetic torque,i have designed two mobile jammer circuits.the aim of this project is to develop a circuit that can generate high voltage using a marx generator,-10 up to +70°cambient humidity,the pki 6200 features achieve active stripping filters.this project shows charging a battery wirelessly.this can also be used to indicate the fire,5 kgkeeps your conversation quiet and safe4 different frequency rangessmall sizecovers cdma.140 x 80 x 25 mmoperating temperature,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.the paralysis radius varies between 2 meters minimum to 30 meters in case of weak base station signals,solar energy measurement using pic microcontroller,auto no break power supply control,all these project ideas would give good knowledge on how to do the projects in the final year.a mobile jammer circuit or a cell phone jammer circuit is an instrument or device that can prevent the reception of signals by mobile phones,energy is transferred from the transmitter to the receiver using the mutual inductance principle,2 ghzparalyses all types of remote-controlled bombshigh rf transmission power 400 w.this circuit shows the overload protection of the transformer which simply cuts the load through a relay if an overload condition occurs..