晶体三极管的代换是从事电器维修人员必须掌握的。当没有同型号的三极管更换时往往要用其他类型的三极管来代换,但有一个代换原则,可以总结为以下五个方面: 一、性能好的晶体管可以代替性能稍差的晶体管。如穿透电流小的可代换穿透电流大的,电流放大倍数高的可代换电流放大倍数低的。 Transistor is the replacement of electrical maintenance personnel must be mastered. When not the same type of transistor replacement often have to use other types of transistors to replace, but there is a substitution principle, can be summed up in the following five aspects: First, the performance of the transistor can be replaced by less performance of the transistor. Such as small penetration current can be replaced by a large penetration current, high current magnification can replace the current amplification of low.