Question
What is the most common configuration of an optoisolator or optocoupler?
Answer Options
- A) A lens and a photomultiplier
- B) A frequency-modulated helium-neon laser
- C) An amplitude-modulated helium-neon laser
- D) An LED and a phototransistor
Correct Answer: D
Explanation
An optoisolator (or optocoupler) is an electronic component used to transfer electrical signals between two circuits while maintaining complete electrical isolation between them. This is critical for connecting circuits with large voltage differences or preventing ground loops and noise propagation.
The most common configuration of an optoisolator is an integrated component consisting of an LED (Light Emitting Diode) and a phototransistor. The input electrical signal drives the LED, which emits light. The light travels across a small internal gap and strikes the phototransistor, which detects the light and converts it back into an electrical signal. The gap ensures galvanic (ohmic) isolation between the input and output circuits.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!