New posts in Wall Wart

How does this wall-wart switcher work?

How to power a circuit that needs +9VDC, GND, -9VDC?

Automatically switching from 9V battery to DC wall adapter on insertion

What to do when a device doesn't specify it's DC polarity?

Do I need to use any external parts with a voltage regulator?

Converting passive USB Hub to powered USB Hub, by adding regulated wall-wart as power supply?

How much power is really wasted by a wall wart?