What Distinguishes a Phototransistor from a Photodiode?
A phototransistor is what?   A phototransistor is a photosensitive transistor that is used to boost the photocurrent produced by changing the energy of light.   It is either a two-terminal or a three-terminal device, depending on the design. It might be a BJT (Bipolar Junction Transistor) or a three-layer FET (Field Effect Transistor).   The emitter, collector, and base area are...
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