Principle of high voltage power supply based on PWM chip TL494 is introduced in this paper. The adjustment of the voltage is performed by digital potentiometer controlled by MCU.
介绍基于脉宽调制芯片TL 494的高压电源的工作原理，其电压可由单片机控制的数字电位器进行调整。
Discovery after study, the electric parameter change reason is the dirt adhered at the producing on the surface of potentiometer inner basic chip absorbs wet in high thermal wet ambient.
经研究发现，电参数变化的原因是电位器内部基片表面在生产时附着的脏污在高热潮湿环境下吸潮造成。
The angle measuring system based on PIC single chip computer as controller and precise potentiometer as transducer is stated.
提出了一种基于PIC单片机做控制器、使用精密电位器作为传感器件测量角度的方法。
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