Re: Differences between opto-couplers, photo-couplers & photodarlington opto-couplers
" In electronics, an opto-isolator, also called an optocoupler, photocoupler, or optical isolator, is "an electronic device designed to transfer electrical signals by utilizing light waves to provide coupling with electrical isolation between its input and output"
The Photodarligton opto-couplers have a darligton transistor coupled with photo-sensor instead of a simple transistor at their output for carrying higher loads and better isolation.