Model B schematics

Now that there are Raspberry Pi boards in the wild, we thought it would be a good time to share our schematics with the world. In addition to giving you an idea of how the device works internally, these should also provide the information you need to build add-on boards which attach to the GPIO expansion connector and (in due course) the display and camera connectors.

Note: developers of expansion boards should not rely on the connection of expansion connector pins 9, 14, 20 and 25 to GND, pin 4 to 5V or pin 17 to 3V3 and should instead treat these pins as DNC (do not connect). They may be used to expose additional GPIO lines on a subsequent revision of the board.