Digital Electronics: Optocoupler | Optoisolator - Driving a high-current CREE XLamp XR-C LED 

In this video I introduce and explain the operation of optocouplers / optoisolators (617A) and describe how they can be used to drive independent circuits at the same or different voltage levels. I also demonstrate that we can connect a BC547 NPN Transistor to the optocoupler and use it to drive a larger current. In this case I use a CREE XRC White 57 (XRCWHT-L1) Lumen White LED. This tutorial/experiment is part of a series of experiments that introduces digital and analogue electronics in a module EE223 at Dublin City University, Ireland. The materials are at www.eeng.dcu.ie...