FunPython

This illustrates four common types of optocouplers, each with a different output device: photo-transistor, photo-Darlington, photo-SCR, and photo-TRIAC. These optocouplers provide electrical isolation between input and output while allowing signal transfer via light. Devices like 4N25 and 4N26 use a photo-transistor for general switching, 4N29M and 4N30M use a Darlington pair for higher gain, 4N39 and 4N40 use a photo-SCR for triggering AC loads, and BRT12/BRT13 use a photo-TRIAC suitable for AC switching applications.
Vishay onsemi Mouser Electronics DigiKey element14 Electronics

The Commodore 64 Returns, As the FPGA-Powered Commodore 64 Ultimate Jack Tramiel's "computer for the masses" is set for a surprise rebirth, thanks to a YouTuber's acquisition of the Commodore brand.