i made a BTTF Flux Capacitor for free, by using an old pc as my *parts*
its wired up that it runs off the 12V car battery in my golf.
total cost >> FREE!
Step 1: Parts
3 old spark plugs
black rattle can
if you are like me you will have a least one old pc around the place, with windows 3.1 or 95 or something like that or have come a cross a old unwated pc and you get it for free :D
well thats just me...
taking the old pc apart
stripping the old pc down you will notice there is leds on:
>>the cd rom drive,
>> front light for hard drive in use
>> sometimes a reboot led beside the reboot button
and the Start/Power button
now as it turns out each of them can have different colours,
ie, hard disk can be orange,
flop disk can be green or orange,/yellow
cd rom is usually green,
hard disk and restart can be red or orange...
so usually there will be Green Red Orange/ yellow
you will need 4 LEDS
reason for 4 leds is you are running a 12V batter power supply, and the pc operates at 0-5Vs
but that does not mean the LEDs are 5v leds, if they are only coming on for a second, they can be 3v leds
so for safety to prevent them from burning out we are going with 4, plus, more leds = more light
just to note, more leds = more lights but more leds means the leds are not as bright but this is good as you dont want extremely bright leds in the back of your car
for this step you should have 4 leds its best if they are all the same colour or near enough. to being the same colour (ie orange and red is ok)
what i did was got 2 old pcs and got 4 Green LEDS