i ****ed up linux on my pi trying to install bluetooth, so i restored the original image file. now i cant remember what i did to get my network to work. **** LINUX!!! im installing riscos as soon as the pi version comes out.
also keeping the raspberry pi powered is a chore by itself. i dont have a single adapter that can source the neccisary ampage. so running off batteries is what ive been doing. of course being makeshift battery packs i made from a dead laptop's battery, they dont have any safety circuitry. i have a shottkey diode protecting my polatity not that there arent 50 other ways the supply can short out and fail, being built on a breadboard and all. seems the maximum output you can get out of an lm7805 in a to-220 package is about an amp and a half. assuming you have a good heatsink. now the pi uses about 700ma. so long as you don try to stick a wifi dongle on it or a bluetooth dongle on it your fine. if you do, you need moar ampage.
i also found a big ass chipset heatsink from a mobo i threw away a long time ago, and i bolted it to my main regulator, so it can source the full 1500 ma. 700ma to the pi, 800ma to the usb hub and all its crap. id prefer 2 amps, sending most of it to the usb hub and only source what is neccisary for the pi. i hear you can hook two 7805s to the same power supply, and connect their outputs together with a small resistance between it and the output rail. and this effectively gives you 3 amps with a large heatsink on each.
of course thats not really gonna work. running batteries most of it will get wasted as heat. as soon as the batteries drop below 7 volts (2 lithium, cells in series, balance charged), the regulated voltage starts to drop as well. their nominal voltage is 7.4 volts, and im charging them to slightly over 8 volts, which is probibly higher than you should go with a lithium battery. but it only seems to last a couple hours and then the pi starts acting all glitchey because it doesnt have enough power. i really need a switch mode regulator. i could just hook my helicopter battery too it and it will run all day.
im sure if i take a rock to one of my switch mode regulators i can pull out the ic that handles everything. and then it only takes about a page of math to set it up the way you want. and to wrap your own inductors becuse its that or a bunch of unlabeled salvaged inductors. you only need one though. its mostly capacitors, for filtering and storage. i could just buy a module, a ubec or one of the simpler more expensive single chip switching regulators. but i dont have the 4 bucks neccisary to buy one and dont really want to wait 3 more weeks till i get more money. maybe i could steal something.