开关通断显示器是一种能直接显示触点开关(或熔丝)通断状态的一种新型电子器件。开关通、断时,开关两端的电压不同,即开关通时,开关两端电压为零(接触电阻忽略不计);开关断时,开关两端有压降。利用开关通断的这一特点,通过电子电路识别,并用绿红两只发光二极管来显示其通断状态,这就是开关通断显示器。图1为电路原理图,图2为外形图。 Switch on-off display is a direct display of contact switch (or fuse) on-off state of a new type of electronic devices. When the switch is on and off, the voltages at both ends of the switch are different, that is, when the switch is on, the voltage across the switch is zero (the contact resistance is ignored); when the switch is off, there is a voltage drop across the switch. The use of switching off of this feature, through the identification of electronic circuits, and with two red and green LED to show its on-off state, which is the switch off display. Figure 1 circuit diagram, Figure 2 is the outline.