Optocoupler is an electric light as a medium to transmit electrical signals in an optical an electrical switching device. It consists of two parts and the light emitting source composition. The light emitting source and the light assembly in the same closed housing, isolated from each other with a transparent insulator. Hair pin as an input source, the light pin as an output, the common light emitting source is a light emitting diode, the optical receiver for the photodiode, phototransistor, and so on. Types of optocouplers more common type photodiode, phototransistor type photoresistor type, light control thyristor type, photoelectric Darlington type IC type. Shown in Figure 1 (a round shape with a metal shell package, plastic dual in-line, etc.).
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