当前,手工晒图机还使用较多,用人工计时控制晒图纸的曝光量,很难恰到好处,晒出来的蓝图质量也差。为此,我给晒图机试装了一个曝光定时控制器。经过一段时间的使用证明,晒出来的蓝图非常清晰。现将控制器介绍如下:1.工作原理曝光定时控制器的电路见图1。使用时,合上开关K,红色指示灯 At present, manual drawing machines are also used more often and artificially timed to control the exposure of drying papers. It is difficult to get proper results and the quality of blueprints that are printed out is also poor. For this purpose, I installed a exposure timing controller for the blueprinter. After a period of use, it proved that the blue print was very clear. The controller is introduced as follows: 1. Working principle The exposure timing controller circuit is shown in Figure 1. When using, close switch K, red indicator light