光敏三极管对光的反应是非常敏感的,它在正常情况下,正向电阻可达几十兆欧姆,遇光照射,则瞬间内降到几千欧姆左右。去年我们利用它的这一特性,在DZ664型回放仪上安装了自动跳道光电控制器和磁头起落自动控制装置。在挖掘设备潜力,提 Phototransistor response to light is very sensitive, it under normal circumstances, the forward resistance of up to tens of mega-ohms, the case of light exposure, the moment dropped to a few thousand ohms. Last year, we took advantage of this feature and installed the automatic jump controller and head-and-landing automatic control device on the DZ664 playback device. Potential mining equipment, mention