特点：基极-发射极间内置电阻，高电压。
有些静电计和皮安计具有内置的电压源，能够自动地计算出未知电阻。
Some electrometers and picoammeters have voltage sources built into the instrument and automatically can calculate the unknown resistance.
内置光敏电阻(CDS)，根据环境光线亮度，可自动控制红外灯开启与关闭，更能延缓红外灯的工作寿命。
Built-in photosensitive resistor (CDS), Brightness according to ambient light, Automatic IR LED can be opened and closed, More delay infrared lamp working life.
NPN晶体管开关应用中，接口电路和驱动电路的应用。内置偏置电阻(100和100科姆)。
NPN transistor for switching applications, interface circuit and driver circuit applications. With built-in bias resistors (100 and 100 kOm).
NPN晶体管开关应用中，接口电路和驱动电路的应用。借助内置的偏置电阻(2.2和2.2科姆)。
NPN transistor for switching applications, interface circuit and driver circuit applications. With built-in bias resistors (2.2 and 2.2 kOm).
大功率半导体激光器驱动电源内置恒压源，通过控制采样电阻两端电压调节恒流源电流大小。
Current driver of high power LD with inner constant voltage source adjusts the output current of the driver by controlling the voltage of the sampling resistance.
如果IC2包括内置的上拉电阻，就可以忽略电阻r 3，许多现代微处理器都是这样的。
Omit resistor R3 if IC2 includes built-in pullup resistors, as do many modern microcontrollers.
如果IC2包括内置的上拉电阻，就可以忽略电阻r 3，许多现代微处理器都是这样的。
Omit resistor R3 if IC2 includes built-in pullup resistors, as do many modern microcontrollers.
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