For a science project I need to turn on and control two motors and turn on and off two lasers via the computer. The motor control was already covered in the thread "Help: Digital Polarity Inverter". It would be absolutely awesome if someone could look over my circuit with the lasers/an led added for a final time. Any assistance would be great since Im still a newbie for this subject. One of the major questions I had was when adding resistance so the 12V doesnt fry the 3V lasers, do you add the resistance after the NPN BJT, before the laser, or does it really matter?
Well thanks again in advance!
-Brandon