Hello, I've been trying to replicate this tutorial http://fishtankprojects.com/diy-aquarium-projects/arduino-controlled-dosing-pumps.html
In the second picture (the one with the red writing on it) I'm not quite sure how he uses the diodes and motor grounds he specifies in the supply list. it seems as if he just solders the diode behind and next to the male connector.
I'm also not quiet sure how he takes the 12v current, attaches it to the voltage regulator, and gives power to both the board and the motors.
And lastly I am not sure how he uses the transistors either, as you can see I'm pretty confused on this.
Any clarification would be greatly appreciated. Thank you.