I have googled quite a bit, but did not come up with a conclussive result, which is why I asked here.
Looking at tutorials, such as http://arduino.cc/en/Tutorial/MotorKnob the ULN-chip does not receive 5v at all.
I do however not know if the driver circuit I have should receive 5v (perhaps to drive the LEDs), or if the VCC it has should have 12v directly.
I guess I can match the colors of my motors leads to the ones on various pictures I can find, where the motor have a connector attached.
Whether I can drive multiple of these circuits from the same output pins will probably have to be a risk I will have to take,
I have nothing against doing my own research, and experimenting is a part of the game - but appreciate some pointers before attaching 12v to the system 