O'Reilly logo

Optoelectronics Circuits Manual, 2nd Edition by R MARSTON

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

7

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 ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required