Optocoupler is an electronic device that functions as a separator between a power circuit with control circuit.
Optocoupler is one of the components that use light as a trigger on / off it. Means the optical and opto coupler means triggers. So that could mean that the optocoupler is a component that works based on the trigger opto-coupler optical light is included in the sensor, which consists of two parts, namely the transmitter and receiver. Basic circuit can be shown like in the image below:
optocoupler
Part transmitter or transmitter is built from an infrared LED to get a better endurance than using regular LED. These sensors can be used as an insulator of low voltage circuits to high voltage circuits. In addition it can also be used as a detector of a barrier between the transmitter and receiver test by giving space in the middle between the LED with a photo transistor. This usage can be applied to detect the rotation of the motor or marker to detect holes in the floppy disk drive computer. But the authors make an optocoupler device to detect rotation.
The use of an optocoupler depending on their needs. There are various shapes, types, and type.As MOC 3040 or 3020, 4N25 or 4N33dan forth.
In general, any type of optocoupler data sheet able to bear the stress up to 7500 Volts without damage or leakage. Usually the market availability of the type optocoupler 4NXX or MOC XXXX where X is the number of parts valuenya. For this type 4N25 have isolation voltage of 2500 volts with a maximum capacity led fordward energized at 80 mA. But the magnitude LED currents used ranged from 15mA – 30 mA and to link it with the +5 volt voltage divider resistance is required.
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