Because we put the fuse on the 12v side, (which can vary from 11.5-12.5 volts, we have to use a value 2.5x smaller than what we want on our USB side. More information on the fuse: you can use a higher rated one if you use a different transistor that can take higher amperage. If you have a strange LED or want to make it brighter, please use this resistor calculator. Any LED will do, here are the values for the most common LEDs : 1.2v = 220ohm, 1.6v = 180ohm, 2v = 180 ohm, 2.2v = 150ohm. if you choose to add an LED, you need an LED and an appropriate resistor for 5V.Header boardsare a great and easy way to do this. For higher amps (many devices at once), use a TO220 ( and a bigger fuse) a L7805CV voltage regulator for lower amps.2 different colors of wire (so that you don't get confused later on).
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