Sorry, I try to explain again. I'm trying to activate a relay from the output of Arduino UNO The relay is 12 Volts and I have other of 9 volts. The transistror I use is a 2N222A and I do not know that put in emitter resistor I've tried everything and no way to activate the relay coil . If is act…

Rookie - start over

PapaG February 3, 2013, 6:06pm 4

cargol:
What is the base-emitter resistor should I wear?

thank you

How much current does the relay you intend to use need?

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