Universal USB Power Supply Kit: 10 Steps (with Pictures) Design Considerations. Many wall warts do not output a commonly used voltage rating used by Parts List. Note: A full parts list is attached to this page. Listing the part, manufacture, part number, Board Layout. The most challenging part of all this wasn't creating the schematic and deciding what Tools Needed. Before we start piecing this together lets gather the tools we'll need for this. Tools: See all full list on instructables DIY USB Power Supply – Circuit Wiring Diagrams Here is a quick and easy way to make an USB charger / power supply powered by the wall outlet. This can be used to charge / power a PSP, iPod or any other USB device. First you need to acquire a regulated 5 vdc wall wart rated at 500ma or higher. The one I used is from an IoMega Zip drive. It has a switching regulator with an output of 5vdc @ 1amp.