12v to USB Adapter \ 12v to 5v Transformer (great for Cars) : 6 Steps - Instructables

12v to USB Adapter \ 12v to 5v Transformer (great for Cars): This will show you how to make a 12v to USB (5v) adapter. The most obvious use of this is for 12v car adapters, but anywhere you have 12v you can use it! If you need 5v for anything other than USB, simply skip the steps about adding the USB ports …

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