Semiconductor devices at both ends of the crystal diode (crystaldiode) Solid-state of. The main characteristic of these devices is a current having a non-linear - voltage characteristics. After that with the development of semiconductor materials and process technology, the use of different semiconductor materials, doping profile, geometry, developed a wide range of structural, functional use of a variety of different crystal diode. Manufacturing materials with germanium, silicon, and compound semiconductors. Diodes can be used to generate, control, reception, conversion, amplification signals and for energy conversion. a, visually judge semiconductor diode polarity: general physical circuit diagram can be seen through the eyes of a semiconductor diode direct positive and negative in the physical end to see if there is a color-coded negative, the other end is positive. b, judge with a multimeter (pointer table) semiconductor diode polarity: usually use a multimeter ohm (R * 100 or R * 1K), then using a multimeter connected to two leads on the two poles of a diode diodes respectively manufacturers, when the diode conduction, measured resistance is small (generally between tens of ohms to several thousand ohms), then the black pen then the positive diodes, red pen then the negative diode. When the measured resistance large value (typically a few hundred to several thousand ohms) Jinan diode, then the black pen then the negative diode, the red pen then the diode cathode c, test Note: Use a digital multimeter to test diodes red pen then the diode cathode diode, diode black pen then negative, then the measured resistance is diode forward conduction resistance, which is multimeter pointer pen then law contrary. Zhejiang diodes, diode, gold credit provided by the Science and Technology Industrial Co., Ltd. Qingdao integrity. Integrity Technology Co., Ltd. Qingdao (www.qdjcx.com) strong, credible, in Qingdao, Shandong diode industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve the integrity of innovative ideas will lead the gold into the brilliant and you work for a better future!