This kind of mini portable cell phone jammer can shield DCS

The mobile phone camera module 1.8V supply voltage. MTK chipset mobile phone camera circuit 3 magnetic sensor electronic compass (also known as electronic compass) is an important navigation tool that can provide heading and attitude of moving objects in real time. As semiconductor technology advances and the development of the mobile operating system, integrated more and more sensors, smart phones become powerful. cell phone jammer has its specific advantages.
Electronic compass function on many mobile phones. Popular in various software platforms based on the application of the electronic compass (such as the Android Skymap). The following diagram is a cell phone, electronic compass function. The phone's electronic compass electronic compass, a detected magnetic field of three-axis magnetic sensor and a triaxial accelerometer. Magnetometer used anisotropic magneto-resistance (Anisotropic Magneto is the Resistance) the size of the material to detect space magnetic induction. This crystal structure of the alloy on the external magnetic field is very sensitive to changes in the strength of the magnetic field will lead to AMR's own resistance value changes. An electronic compass system requires at least a three-axis magnetometer to measure the magnetic field data. The technology development is based on the original technology of cell phone jammer .
A three-axis accelerometer to measure compass inclination, part of the distribution of three-dimensional space of gravity and magnetic data transmitted to the processor through the signal conditioning and data acquisition. Processor through the magnetic field data to calculate the azimuth, tilt-compensated by the gravity data. Processed output azimuth is not the attitude of the electronic compass disk space. The electronic compass works. Hall sensor NOKIA N73 slider phone, the Hall sensor circuit with a tiny voltage generated when the magnetic field acting on the Hall element and the amplifier and the Schmitt circuit transistor conduction output low; no magnetic field effect transistor cut-off, the output is high. This kind of mini portable cell phone jammer can shield DCS, CDMA and GSM.The heat source and strong electromagnetic source should be prevented for cell phone jammer
Hall sensor corresponds to the direction of the roof has a magnet in a slider phone with a magnet to control the output of the sensor signal of the Hall sensor, when closing the slide, the Hall sensor output low as interrupt signal to the CPU to force the phone out of the running programs (such as on-going calls), and lock the keyboard, turn off the LCD backlight when open the slide, the Hall sensor output is 1.8V high level, unlock the phone, backlight light, turned on is to break into the phone.