The covering radius of cell phone jammer is large enough

Some FET source and drain can be used interchangeably, the gate voltage can be positive or negative, good flexibility than the transistor. FET in a very small current and low voltage conditions, work, and its manufacturing process can be easily integrated into many a piece of silicon FET, so the FET. System of completely personal responsibility is performed to cell phone jammer .
Identification with the polarity of the FET is good or bad: the multimeter range selection in RX1K file, use the black pen then the D pole, S pole of the red pen then hand while touching look at G, D pole, was instantaneous FET should turn state, that is, the smaller gauge needles swing to the position of resistance, then a hand touched about G, S pole, the FET should be no reaction, that is, hands back to zero position does not move at this time should be played to determine the effect of tube well tube. The covering radius of  cell phone jammer  is large enough.
The meter range selected in RX1K file FET were measured resistance between the three pins, if the feet and the other a resistance value between the two legs are infinite, and then after switching table is still infinity pen , then this pin G pole, the other feet for the pole S pole and D and then re-use the multimeter to measure the D pole S pole and the resistance between the first, and then measure the time table document exchange, which a small resistance , black pen then the S pole, the red pen then the D pole.  cell phone jammer  adopts the intelligent control technology in shielding system design.Fire Resistance of Adapter of cell phone jammer
Online measurement of non-line measurement of non-solder wave in the IC circuit is not, by measuring the DC resistance between the pins with a known type IC with DC resistance between the pins compared to determine they are normal. Online measurement of on-line measurement method is the use of voltage measurement, resistance measurement and current measurement method, measured by the circuit of each IC pin voltage, resistance and current values are normal, to determine the IC is damaged. Substitution method substitution method is to use the same well-known model, substitution with specifications to test integrated circuits integrated circuit, the circuit can determine whether the damage. When the used field area is larger than the effective shielding range, it is suggested that more cell phone jammer  should be adopted.