[Update April 10:] I preferred to use a standard resistor value so I added a 5.1 ohm one. Everything seems to work properly. [Update March 19:] I found that there are cheap stocked capacitors with 1500uf. So I changed the capacitance in order to smooth the electrons movement when the switch turns off. [Primary description:] Here I made this simple schematic of a backup charger for my mobile phone. According to Sony Ericsson, mobile phones should be charged in 5 volts with 850mA. So the LED has the characteristics of my cell phone! And you may use a regulator in place of the resistor. Enjoy!
