HOW AN OPTOCOUPLER OR OPTOISOLATOR WORKS
An optocoupler (or an optoelectronic coupler ) is basically an interface between two circuits which operate at different voltage levels. The key advantage of an optocoupler is the electrical isolation between the input and output circuits. With an optocoupler, the only contact between the input and output is a beam of light. Because of this it is possible to have an insulation resistance between the two circuits in high voltage applications where the potentials of two circuits may differ by several thousands of volts. Read More.....