Google "level shifting high-side switch Arduino" perhaps?
With this circuit how much can I get ? Because actually think they are a problem, in my coil I have 0.5 V exactly like the tension of the arduino on the base pin of each transistor but I doesn't have load or less than 50mA.... It not works with little diodes...
I really can't understand most of this paragraph I'm afraid. I've told you what darlingtons from a 5V supply
can do.