此外，该开关晶体管的集电极还直接连至一pg信号输出端，发射极还直接连接至一控制信号输入端。

Moreover, the collector of switching transistor is also connected to an output end of PG signal directly. The emitter is also connected to an input end of a control signal directly.

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例如，晶体管是可控的开关，但它在集电极和发射极之间是定向的，并且在基极和发射极之间是配合控制的。

For example, a transistor is a controllable switch, but it is directional between the collector and emitter, and it has interactive control between the base and emitter.

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