LM317T Voltage Regulator with Pass Transistor

This is a DIY solar powered USB charger with schematic that you can build to charge your ipod, blackberry, iphone, camera, or any other electronic device that you can plug into a USB port. There are 2 (in quantity) 5 volt solar panels connected in parallel to a 12000 uF capacitor. The positive is then connected to pin 1 of the voltage regulator (low dropout), pin 2 connected to ground. Pin 3 and ground are then connected in parallel with a 470uF cap, which is then connected to the USB port.



http://www.youtube.com/watch?v=ElTchaGTy60&hl=en