Switch on , you may adjust the speed by the inside speed controlpotentiometer ;
启动开关，可通过内部速度控制电位器来调整转速；
2
The secret is a small motor actuated volume controlpotentiometer normally find in audio home systems.
秘密是一个小马达驱动的音量控制电位器通常会发现在音频家里系统。
3
The temperature sensors, start switch S1, and current controlpotentiometer are all connected to the board using servo lead wire (available at many hobby shops in 10 foot lengths).