开关三极管（Switch transistor）的外形与普通三极管外形相同，它工作于截止区和饱和区，相当于电路的切断和导通。由于它具有完成断路和接通的作用，被广泛应用于各种开关电路中，如常用的开关电源电路、驱动电路、高频振荡电路、模数转换电路、脉冲电路及输出电路等。
光控MOS栅固态继电器是由MOS栅控晶闸管、开关三极管、光电耦合器、增强型MOSFET和齐纳二极管组成的新型开关器件。
Optically triggered MOS gated solid state relay is a new switching device, which is composed of an MOS gated thyristor, a phototransistor, an enhanced mode MOSFET and a Zener diode.
用继电器即可；但如果需要调速，可以使用三极管，场效应管等开关元件实现PWM（脉冲宽度调制）调速。
With the relay can be; but if you need to speed, you can use the transistor, FET and other switching elements to achieve PWM (pulse width modulation) speed.
元件种类components Kind电容器、晶体管、三极管、LED灯、按键开关、电阻、连接器、线圈、电位器、保险丝座、熔断丝等立式编带封装料。
Capacitor, transistor, the transistor, LED lights, key switch, resistor, connectors, wire, potentiometers, fuse blocks, fuse, and other vertical Tape packaging materials.
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