Schematic

 
Schematic

After drawing this schematic, I replaced C1 with a cap rated for 25v (also low ESR).

And, after reading a great post by Lady Ada on iPhone charging, I replaced R2 with a 22k ohm resistor, which tells the iPhone not to draw more than 500ma. See her page for more info:

www.ladyada.net/make/mintyboost/icharge.html

 Posted by at 12:35 am