Determine the total input resistance of the emitter-follower in Figure 6-27. Also find the voltage gain, current gain, and power gain in terms of power delivered to the load, R1. Assume B = 175 and that the capacitive reactances are negligible at the frequency of operation. Vec +10V R, 18 KI |2N3904 IV ms 10pF R. 18 K2 10 F R LOKN 1.0 k2

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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.