ZipPi the Raspberry Pi computer now has a MOSFET and board, and uses two case LEDs that indicate power to the board, and power to the Pi. It boots up, and we have played with it, but it needs a dedicated screen, mouse and keyboard, and a wireless dongle. I might get something with a decent antenna, or I might just get the Pi Dongle again. Those have to be extended out the back so I can close up the aluminium case and have it done. The board also has to be mounted inside its allotted hidden dead space. It works, though. And nothing burned down.