Add USB power to your alarm clock

Here is a cool mod to add a USB port to your alarm clock.

“To add our USB power port, we’ll steal some DC voltage from the clock. We are going to run power through a LM 7805 voltage regulator to take it down to 5 volts. Adding a 220uF capacitor between the output and the ground can help smooth out the voltage if that’s a concern. We referenced the USB pinout page at pinouts.ru and the data sheet for the LM7805.”

Via: Digg