引用: 事实上，在大多数情况下，它会反过来 - BC5xx是简单的通用小信号晶体管，但2222是一个（相对）高频开关transistor.For这种带宽虽然，你可以使用几乎任何PNP和NPN晶体管。
Actually in most cases it would be the other way round - the BC5xx are simple general purpose small signal transistors but the 2222 is a (rela
tively) high frequency switching transistor.For this kind of bandwidth though, you could use pretty much any PNP and NPN transistor.
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