在实际工作中,有时需要区别是红外发光二极管,还是红外光电二极管,或是光电三极管。其方法是:若管子都是透明树脂封装,则可以从管芯安装处来区别。红外发光二极管管芯下有一个浅盘,而光电二极管和光电三极管则没有。若管子尺寸过小或黑色树脂封装的,则可用万用表(置1kΩ档)来 In actual work, sometimes need to distinguish the infrared light-emitting diode, or infrared photodiode, or phototransistor. The method is: If the tubes are transparent resin package, you can distinguish from the die mounting. There is a shallow plate below the IR LED die, while the photodiode and the phototransistor do not. If the tube size is too small or black resin package, you can use a multimeter (set 1kΩ file) to