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
Step 2: Testing Leds
using the transformer at 5v i was able to test that each of the leds worked, and i has a number of leds so could see which gave off the most light (some leds were very big and some were very small in size)
and some gave off more light that others
Step 3: Layout
the led in the middle pointed upwards, so it lights the 2 upper Y pipes. while at the end of the Y pipes there is a single led pointing back in to the center of the Y
on a scrap piece of wood, i drilled some holes and laid out the basic shape
the wires for the leds are hidded by drilling small holes to run the wire through..
spark plugs out of a old car were used to hide the wire more.and to give a more BTTF Flux capacitor look.
the length of each pipe i got from another person here on instructables.com, sorry dont know your name
but i didnt use 9 leds like he did,
the main difference is that my flux capacitor does not flash, its just ON or OFF.
Step 4: Construction
box size is 30cm x 40 cm
Step 5: Wiring
are the spark plugs in the right places?
next was to wire up the leds,
i has them in parallel
that means all the plus terminals were grouped together and all the negative terminals were grouped together. this allowed me to play around with lighting it and no fear of burning out the leds at 5v since they are all rated at about 5vs
(Transformer was set at 5V)
once i was happy about how it would look and which colour of leds i was going to use. (red and orange) or Green and Green..
as it gave a nicer glow from the green i went with them.
and went to wire them up in series
this means daisy changing them taking the negative terminal and soldering it to the positive terminal of the next led, so when i was finished i had one positive terminal not soldered at one end and 1 negative terminal not solider at the other end. all of the 4 leds were now wired in SERIES
and would require 12V to run them. you can get away with using 3 leds BUT YOU WOULD NEED A RESISTER.
this can be worked out by I/(VxR)
if each LED needs 200mAs and at 12V all that is missing is R
200mA/ 12V = R
0.1666 oham Resister
but to get away with out a resister just add another led, :D
Note the leds were wired up in series after they were threaded though the holes in the plywood.
TEST the LEDS with Transformer at 12V making sure none of the soldered connections touch. (rap with tape)
Step 6: Show Off
this is my finished project.
in the car, with a multimeter i found out which wires become live when the key is turned on.,
then is as simple as cutting into it. running a extra cable from it up to a on.off sw. then from the sw run some wire back to the Flux capacitor. and attach it to your POSITIVE wire. and cover with tape so it does not earth.
then find some where that is connected to Ground on your car ( to the metal in the car) and connect a connection from it to the NEGATIVE on your capacitor.
now turn the car on. flick the switch and get up to 88 miles a hour.
then your going to see some serious shit
(dont forget to screw the FC to the floor!!!! )