I have a question about controlling relays by using optocoupler. I have some optocouplers to isolate MCU's power and Power supply for the relays (to control LEDs, DC and AC drivers).
1) Can I control the relay according to the schematic below but without FET? Do I have to use FET.
2) I have a 24V DC and 220V AC to control relays, can I use the same schematic for AC connections?
Thank you so much.