Electronics for ER: Relay finder

[@naushadkhan3053]

Thanks

[@ionwind]

Hi, i need to to know is this relay can be used only by 12v supplie not 220v, thanks

[@viz8390]

Can't see the end result.

[@SuperSUMAN111]

The last part is unclear.

[@mickc6926]

Not the best video in explaining the relays functionality