光敏晶体管有光敏二极管和光敏三极管两大类。在光控电路中使用光敏器件也以光敏二极管和光敏三极管为主。下面介绍一下这两种光敏管的区别及使用注意事项。(一)两者的主要区别1.光电流光敏二极管的光电流一般只有几微安到几百微安,而光敏三极管的光电流一般都在几毫安以上,至少也有几百微安,两者相差10倍以上,因此在实用电路中,光敏二极管产生的光电流往往要经放大 Phototransistor photodiode and phototransistor two categories. In the light-control circuit using photosensitive devices are also photosensitive diodes and phototransistors based. The following describes the difference between these two photosensitive tube and the use of precautions. (A) the main difference between the two 1. Photocurrent photodiode current photocurrent generally only a few micro-amps to hundreds of micro-amps, and phototransistor photocurrent is generally more than a few milliamps, at least a few hundred microamps, two A difference of more than 10 times, so in the practical circuit, the photodiode phototransistor often have to be amplified