LOL magic smoke... I've definitely let some of that.
Not to drag this on forever, but I just wanted to say I never add all the other components. You just need to look up the pin out for an 7812 or 7809 and hook it up, it'll work fine. Definitely don't stress about the other stuff, especially if you don't even know how to solder. It takes me like 2 minutes to hook one of these up.
When looking at the front
left leg is your input voltage
center leg is your negative, solder two wires to that leg (one from power source one to the arduino)
right leg is your output voltage for the arduino
I personally would use the 7812 because I read somewhere the closer you can get to 12vdc without going over 12vdc the better, the 7809 will work fine too though.
Good Luck and don't forget the heat sink. They get hot...
"the other stuff" (capacitors) is not ther only to give your board a better look, it really improves the regulation. Even if, for your use, it works without it, it will work better with it.
Not all we can read "somewhere" is truth ;)
There are 2 reasons why I wouldn't use a 7812 :
- if will only provide a well regulated output when the battery is 14V and over. Most of the time, the battery will be a little under 14V, and the output will be unstable
- the output of the arduino regulator is 5V, right ? 12-5 = 7V !! The shield needs 150-200mA (and more during startup)
7X0,2 = 1,4W --> the arduino reg. will be very hot . I think it is easier to put a heatsink on the external regulator. Using a 7809 or a 7808 allows to split the power, and with a heatsink, the 7808/9 will be OK.