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conrad electrical components are photodetectors that convert light into current or voltage signals depending on the mode of use. The die often uses a PN junction with photosensitive characteristics, which is very sensitive to changes in light, has unidirectional conductivity, and changes its electrical properties when the light intensity varies. Therefore, the current in the circuit can be changed by varying the light intensity. Photodiodes are also called photoelectric diodes. Photodiodes are similar in structure to semiconductor diodes; their die is a PN junction with photosensitive characteristics and has unidirectional conductivity, so during operation it needs