Instructables

What kind of relay do I need?

How do I find out which kind of relay switch I need for my alarm clock project (connecting an alarm clock to a motorized water gun). What information do you need? Thanks.


You need to know how much voltage and current will be passing through the switch side of the relay and how much voltage and current you have available to power the coil on the relay. Then start looking for relays that match those stats.