常用元件汇总，包括：1N系列二极管、74系列、4000与4500、变容二极管参数、常用二极管、常用芯片、场效应管性能、光电器件、横流二极管、快恢复二极管、三极管等-Summary of commonly used components, including: 1N series of diodes, 74 series, 4000 and 4500, Varactor parameters, commonly used diodes, commonly used chip FET perform