This is a little box I made because I was trying to use
a thumbdrive with my nokia n770 internet tablet. I used it
mainly as a usb power source of my various gadgets that are
powered by usb.
7805 Voltage Regulator
audio port and jack
12v car adapter
2 usb ports
This can fry your cd players input channel.
I made the mistake of plugging it in to the power first,
then plugging my mp3 player into it, then pluggging in the
headphones line to my cd player,
it fried my input line :(