Optocouplers are available in four general types, each one having an infra-red LED source but with different photo-sensitive devices. The four optocouplers are called the: Photo-transistor, Photo-darlington, Photo-SCR and Photo-triac as shown below. There are many different applications for optocoupler circuits, so there are many different design requirements, but a basic design for an optocoupler providing isolation for example between two circuits, simply involves the choice of appropriate resistor values for the two resistors R1 and R2. Optocouplers, also known as opto-isolators, uses infrared light to transfer electrical signals between two electrically isolated circuits and are commonly classified by their photosensitive output device What is an Optocoupler? An optocoupler (also called an opto-isolator, photo-coupler, or optical. When considering switching device selection for control systems, you need to choose between optocouplers, mechanical relays, and SSRs based on the specific needs of your control system. Many engineers overlook this crucial step. However, selecting the wrong switching device can lead to nearly 40%. My purpose here is to use SCR output Optocouplers to control power SCRs. This requires knowledge of basic AC rectification. Optocouplers are very useful when you need to isolate different sections of a circuit, for example in power. OPTOCOUPLERS OR OPTOISOLATORS are devices that enable efficient transmission of DC signal and other data across two circuit stages, and also simultaneously maintain an excellent level of electrical isolation between them.
