usb to fm transmitter Answered

 Hi,

I am a very big noob to wiring.
For a present, I wanted to make my cheap old AAA powered fm transmitter into a usb powered one. 
Thinking I was so smart, I cut up an old usb cord and soldered the red to positive and black to negative.
It worked great until it started melting the transmitter. 
So I now I realize that usb is much more powerful than 2 AAAs.  heh heh.

I found this:
www.instructables.com/community/USB-to-Travel-Clock-Circuit-Help-/

but it's a bit over my head.  I'm assuming I need to get a capacitor or voltage divider but I could use a little help breaking it down into noob speak.  Plus the transmitter is a little thing, 2 inches, is there a smaller way of checking the voltage?

K, thanks bye!