Cheap Power Supply From Available Components

Step 5 Plug in, Enjoy.

Now screw the wires from your power brick into the right terminals on the board (I don't think it matters, but for convention's sake it might matter to you), and then the wires to go to your power supply into the other terminals (Or the same ones if your lazy and like having to deal with the difficulty of trying to get two wires to stay in the same terminal while trying to screw it in)

I'd try it at low voltages first. Your LED should come on at 3v. However, if the LED doesn't come on, unplug it immediately, and check your circuitry. This means one of two things, either your LED is dead or backwards, or you have a short, and you are rapidly killing your power brick. Examine everything with a multimeter, make sure the LED is going the right way, and then try again. Electrical fires are not fun, so make sure you don't start one.

Another note, I realized that the 7805 has a heat sink for a reason, and that my case was pretty much sealed, so I drilled a few vent holes just to cool things down a bit. I doubt I'll need them, but oh well.

I hope you enjoyed this, and please let me know what you think or ask me questions. Again, if you life in Montreal and know of a place to buy electronic components it would be awesome if you could let me know.

Cheers.