A DIY idea to make a power generator which can be made to produce power using any bicycle. just take it along with you anywhere in the wilderness and your laptop and mobile will never fall short of power. All you need to know is the idea , which you will get in this link and basic electronics and mechanics which you can learn easily on net by googling the terms charge controller or voltage stabilizer to supply constant supply of electricity to your device, asking help to your engineer friend would make things further easier. Setup is similar to small generators attached to wheel for lighting headlights on bicycles easily available on many diy sites.
So check out this link to get the idea of making your own power generator — http://www.econvergence.net/The-Pedal-A-Watt-Bicycle-Generator-Stand-s/1820.htm
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