The key advantage of an optoisolator is the electrical isolation between the input and output circuits the only contact between the input and output circuits is the stream of light. If we vary the LED supply, the amount of light changes and this causes the photo diode current to change. The output voltage depends on how large the reverse current is. The voltage across the photo-diode is given by : An optocoupler (opto-isolator) is useful in isolating two separate circuits while still allowing the input-side circuit to control the output-side circuit. Usually opto-isolators transfer digital (On-Off) signals, but some techniques allow them to be used with analog. A common type of opto-isolator (or Optocoupler) consists of an LED and a phototransistor in the same opaque package. The light from the LED hits the photo diode and sets up a reverse current through resistor R2. Aside from power supplies, a common application of galvanic isolation is Ethernet connections on a circuit board. When the LED is energised, current flows through the LED. is referred to as optocoupling because the output from the LED circuit is coupled via light to the photo-diode circuit. It is a control circuit for the FL5150 dimmer, where the GNDA on the device is floating with the mains input. The LED is on the left and the photo-diode is on the right. (a photoemitter e.g., a LED) to its output (a photodetector e.g., a photo-diode). An opto-isolator (also called an optocoupler, photocoupler, or optical isolator) is an electronic component that transfers electrical signals between two. The optoisolator is enclosed in a single device (see image) and has the appearance of an integrated circuit or a transistor with extra leads. An optoisolator (also called optocoupler) is a device that uses light to couple a signal from its input
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