【摘要】 主要研究多媒体教室电子设备的功能和状态控制的设计原理，研制一种经济实用的自动控制器。自动控制器使用了电磁继电器和延迟电路，在控制系统中，这种电路的控制过程相当于微动开关的控制过程。自动控制器也利用了投影设备的线控器，对投影设备进行功能和状态控制，提高了对投影设备控制的可靠性。更多还原

【Abstract】 The paper focuses on the functional and state-controlled designing principle of electric devices in the multimedia class by using an automatic controller. Electromagnetic relay and delay circuit are used in the controller. In the control system, the process of the electric circuit equals the process of micro-active switch The wired-controller is used to control the function and the state of the projecting devices, so that the control reliability is greatly improved.更多还原