I want to make a mobile charger to charge my phone which requires max 4.2 V and 418 mA. I want to supply dc voltage of about 5-10V ( It can be less or more then that values, i don't really know exact voltage because I want to use a dynamo for input). The voltage can be very high due to high speed so it should have protection against such matter. Can anyone give me a circuit diagram of a voltage regulator which can work in condition mentioned above.