Abstract
Optocouplers are available in several possible output configurations, including light-dependent resistors (LDRs), various transistor types, logic elements, thyristors and their variations, and even photovoltaic output elements. This chapter reviews the basic characteristics and applications of optos in practical circuits. Key to the operation of an optocoupler is the emitter. Present light-emitting diodes (LEDs) are produced in red, super-red, yellow, and green. The basic types of photo sensors used in optoisolators are photoconductive bulk effect, photoconductive junction, and photovoltaic. The main advantage to the use of an optical coupling device is that switching or variations in a circuit can be made without generating electrical noise. Optos have many different applications such as digital interfaces and linear applications.
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