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Ok i'm going to use only R3 = 10k.
In this case (omiting R2) doesn't that R1 & R3 act as a voltage divider?ratio will be [12x10]/14.7.will this base voltage burn the transistor?there is no current limiting!
You should not add a resistance between Emitter and ground.
If it is a 12V coil and a 12V battery, no additional resistance should be added.Do you mean that the coil resistance is enough ?