First, sorry for the silly question (Electronic newbie here)
Second, If I didn't missunderstand, all the components in the circuit layout (Besides the arduino and easydrivers, in the red box at the image), are for controlling the fan and the laser?
I mean, can I simply replace all that components with a readymade driver or with the circuit from the instructable that IT-Wizard has linked? (http://www.instructables.com/id/DIY-Laser-Diode-Driver-Constant-Current-Source/?ALLSTEPS) I want to learn what I'm doing, and that instructables is more explained, hahaha (Can I have a little more information in using the LM317 with the 3ohm resistor? That seems to be a lot more simple, and cheap, for a newbie like me)
Thanks for all the help
PS: Great Instructable!! :D