Hello,
I want to supply 12 V to an device. I want to control the power supply over an relay.
Which parts do I have to order to connect a normal 12 V power supply to the bread board or directly to the relay?
Thanks in advance.
Kevintosh
Does the relay have a 12V coil? If the relay requires more than 5V or more than 40mA, [u]here is a transistor-driver circuit[/u].
Some relays have a low-current 5V coil and they can be driven directly by the Arduino. In that case, you only need a "backwards" diode across the relay coil to kill the back-EMF (high voltage kick) when the relay is switched-off.