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An opto isolator is an electronic device that prevents high voltages from components in one side of a circuit from damaging or interfering with components on the other side of the same circuit.
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When people build systems that automatically turn on and off light bulbs and other mains-powered devices, they typically use a microcontroller to decide when to turn things on and off. Alas, microcontrollers cannot be directly connected to mains power. So these people typically build a system to allow the microcontroller to indirectly turn on and off the light bulbs: First, the microcontroller turns on (or off) a small LED inside an optoisolator, when turns on (or off) the silicon switch inside the optoisolator, which turns on (or off) a triac. The triac acts just like a light switch, turning on (or off) the light bulbs or other mains-powered devices attached to it. The MOC3011 triac driver optoisolator is often used in such applications.
How do you make a driver circuit for an optoisolator?
All you need to do is provide enough bias current thru the diode, usually less than 20 mA. Find a datasheet and look at the bottom for recommended circuits.
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