First, I'm REALLY new to electronics. I'm building a project that will run 6 solenoids (only 1 operating at a time). I'll be basing my schematic off the attached diagram, but my solenoids are 12v and have a maximum current of 450mA. The transistors I've got are PNP type (2N3906), rated at 350mW. Would these transistors be sufficient under these conditions? Also, are the ratings on the resistors in the diagram sufficient for my needs? How much leeway is there in the resistance values? For example, I've got 100k, 10k, 1k, and 330 ohm resistors. Would any combination of these be sufficient for what I'm doing?