The post has been written for laymen so you need to be a technician or an engineer to make a USB Mobile charger. iPhone doesn’t use some specific science as it’s charged with a USB charger. USB Cable/Connector has +5V between it’s black and red wire (Although some USB cables have different colors but you can check that with a DMM or by glowing an LED if you don’t have a DMM) Almost all USB Gadgets such as USB vacuum cleaners etc. MORE >