Question.2
A hardware developer is probing a 4-pin DIP optocoupler on a board. The schematic shows pins 1–2 on the left and pins 3–4 on the right.
Which side contains the LED (input)?
Select Answer
Pins 1–2 (left side)
Pins 3–4 (right side)
Either side — interchangeable
Cannot be determined from schematic
