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about the transistor and the resistor i mean that the values in the circuit maybe not correct so ignore them. of course i must use some transistor. so actually a power supply of 12V 1A should be good enough for my motor?Are you asking if you need something between the power supply and the motor? If it's a 12VDC motor you can safely apply the 12V power supply across it. If by ignore the transistor and resistor you mean you don't plan to use them then that would be an issue. The Arduino pins cannot source or sink anywhere near 950mA. If you are using the transistor make sure it can survive that current and it has a collector to emitter voltage rating above 12V.