+ 10 v R, 10 kQ Rc 4 k hFE 300 RL 15 kO RE 2.2 kQ 1 k R2 Assuming the following components are changed to this value: Vcc = 12 Volts R1 = 10,040 ohms R2 = 2,209 ohms Rc = 4,008 ohms HFE= 326 RE = 1,042 ohms %3D RL = 15,001 ohms Find r'e

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Photoconductive Cell

Photoconductive cells are light-sensitive resistors in which resistance is inversely proportionated to light intensity when illuminated. These devices consist of a thin single-crystal or polycrystalline film of composite semiconductor materials. Cadmium sulfide (CdS) is used to make the most commercially available photoconductive particles which are sensitive to light in the visible spectrum. Other less commonly used substances respond to infrared light, but not to the visible spectrum. Such substances are lead sulfide (PbS), lead selenide (PbSe), and lead telluride (PbTe), and so on.