![]() The structure of the phototransistor is specifically optimized for photo applications. have the same basic radiation frequency response. In fact, all diodes, transistors, Darlington’s, TRIACs, etc. All silicon photosensors (phototransistors) respond to the entire visible radiation range as well as to infrared. These are activated by light particles and are used in virtually all electronic devices that depend on light in some way. ![]() This is because a phototransistor is made of a bipolar semiconductor and focuses on the energy that is passed through it. Instead of sending current into the base, the photons from striking light activate the transistor. Phototransistors are transistors with the base terminal exposed.
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