I have looked at the following example : http://ruggedcircuits.com/html/circuit__11.html As I understand it, this contains 2 transistors used to link the load current ( not the same V as the IC ) to the Load. I need to use the 5V Arduino output to activate a 12V relay. My question is, as the 2N2…

2N2222P usage on Load Switch

Ulli April 5, 2011, 9:42pm 5

Right, and don't omit the diode! It protects your transistor from induced overvoltage.

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