Optocoupler circuits
Previous chapters have dealt with light-generating devices such as LEDs, and with light-sensitive devices such as phototransistors. The present chapter deals with so-called ‘optocoupler’ devices, which incorporate both a LED and a light-sensitive device in a single package. Optocoupler devices have a wide range of practical applications.
Optocoupler basics
An optocoupler device can be simply described as a sealed self-contained unit that houses independently powered optical (light) Tx and Rx units that can be coupled together optically. Figure 7.1 shows the basic form of such a device. Here, the Tx unit is a LED, but the Rx unit may take the form of a phototransistor, a photo-FET, an opto-triac, or some other type of ...
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