Optical offers galvanic isolation, which solves a lot of problems. Good DACs also handle USB isolation properly, and they solve most of those issues. If you happen to have a DAC that doesn't do this well, then optical isolation is a good thing. Spuriae 1 GoldenSound Member 1...
A: An optocoupler, also known as an optoisolator, is an electronic component that combines an LED (light-emitting diode) and a photodetector, typically a phototransistor or a photodiode, within a single package. It provides electrical isolation between input and output circuits by using light to...