Formerly known phototransistor phototransistor. Phototransistor is irradiated by the light intensity to control the current of the device. Oh it as a photodiode equivalent combination with a transistor, so it has amplification, detection phototransistor can be checked from the appearance, close to tube key (raised) or a longer pin is the emitter e , far away from the tube or shorter another key pin is the collector c. Monitoring Methods: wrap the pipe with a black cloth, with a multimeter R × 1 kΩ stalls, two pen, the reverse of each measuring two pins once were measured resistance should be infinite. For NPN type tube, red pen then the emitter e, black pen then collector c LB11690 wholesale removal of shade cloth, then hands should be deflected to the right, the resistance to deflection by infinite directions little resistance to 15 ~ 35 kΩ or so, then the photo transistor is normal. Deflection angle, the higher the sensitivity. If the hands are still no deflection at infinity or zero LB11690 offer resistance, indicating that the tube has an open or short circuit damage. The semiconductor is a material with special properties, it is not the same as fully conductive conductor, insulator that is not unlike conducting LB11690 monopoly, it is between the two, so called semiconductors. The two most important elements of semiconductor silicon and germanium. We often hear of Silicon Valley, it is because there are a lot of home semiconductor manufacturers. Diode semiconductor devices should be regarded as the patriarch of the family. Long ago, people are keen to assemble an ore radio to listen to the radio, which was later made into a mineral crystal diode. The most obvious is that it's a one-way nature of the diode electrical properties, that is current only from one side in the past, but can not come from the other side (negative from positive flows). We use a multimeter to make to the common 1N4001 type silicon rectifier diode measurements, negative red pen then the diode, when the positive black pen then the diode, the hands will move, indicating that it can conduct electricity; then the black pen then the diode anode LB11690, red pen diodes on the positive, then the multimeter's hands do not move or just a little deflection, indicating poor conductivity. LB11690 monopoly, Jiangsu LB11690, 耀坤 technology provided by Nanjing 耀坤 Technology Limited. Nanjing 耀坤 Ltd. (www.njykkj888.com) strong, credible, in Nanjing, Jiangsu diode industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Yaokun into the brilliant technology and you work for a better future!