Phototransistor

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A phototransistor is a special type of transistor which is constructed such that the base current can be modulate by light. It is traditionally connected such that the output is taken at the collector, and the output is a current proportional to light intensity. Because phototransistors have very low output voltage compliance, it is usually necessary to interface phototransistors to an Operational Amplifier I to V converter.

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