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12v usb adapter7/22/2023 Each 12 volt outlet is fused and the USB outlets are fused as 2 pair, so I have 4 fuses total. What I made has 2 12 volt sockets and a 4 slot USB outlet bank off of a CPU board. I built this circuit for my truck, it only has 1, 12 volt outlet. They are nice because of their screw terminals. Of course, you can also use an existing 12v-5v converter in your car, be it light duty, medium, or heavy duty or use these nice power adaptor that are meant to be integrated into other projects or this beefier waterproof, super high power alternative with a heatsink. Also, if you really want to protect your circuit badly, just put one on both sides. So, if you want 1.5 amps for your USB ports, then you select a 0.6amp fuse, if you want 2.5 amps at 5v, you select a 1 amp fuse, if you want 3.75 amps, you select a 1.5 amp fuse, etc.). 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)
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