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本单位工作场地比较分散,噪声很大,加上各班次用餐时间不一,为此,常常采用一红一绿两只～220 V白炽灯来做信号(?)图1指示(红灯亮或绿灯亮,或者红绿灯同时亮)。一般安装这样的信号装置,从控制开关到信号灯需要架设三根导线,见图1。我们根据二极管整流原理,在控制开关上加了两个二极管;同时在每个信号灯上分别再加一个二极管。这样,少敷设一根导线,同样可以实现传送三种信号的目的
The unit workplace scattered, noisy, with different frequency of each shift meal, to this end, often using a red and two ~ 220 V incandescent lamp to do the signal (?) Figure 1 instructions (red light Or green light, or traffic light at the same time). General installation of such a signal device, from the control switch to the lights need to set up three wires, see Figure 1. According to the principle of diode rectification, we add two diodes to the control switch, and add a diode to each of the signal lights at the same time. In this way, laying a less conductor, the same can be achieved for the purpose of transmitting three signals