The general book is to choose some models to introduce, but there are also more complete, such as < Common electronic components identification\/detection\/selection of first read through > For commonly used diodes, transistors, resistors, capacitors,MOS tubes, switches, etc., there are introductions, identification, measurement, etc. Electronic components are components of electronic components and electrically-small machines and instruments, which are often composed of several parts and can be used in similar products; It often refers to some parts of electrical appliances, radios, meters and other industries, such as capacitors, transistors, spring, spring and other sub-devices. Common are diodes and so on. Electronic components include: Resistors, capacitors, potentiometers, electronic tubes, radiators, electromechanical components, connectors, discrete semiconductor devices, electro-acoustic devices, laser devices, electronic display devices, optoelectronic devices, sensors, power supplies, switches, micro motors, electronic transformers, relays, printed circuit boards, integrated circuits, all kinds of circuits, piezoelectric, crystal, quartz, ceramic magnetic materials, printed circuits Substrate substrate, electronic functional process special materials, electronic adhesive (tape) products, electronic chemical materials and parts, etc. In terms of the quality of electronic components, there are CQC certification in China, UL and CUL certification in the United States, VDE and TUV in Germany and CE in the European Union and other domestic and foreign certifications to ensure the qualification of components.