UnDerzon3: Hope you've got the materials you need by now! It's been a long wait for you. I usually try to not be the least dependent on others as possible for my projects, so that it's not hindered by thing that others are supposed to do, but I guess since your build is a school project your welding teacher is probably the guy in charge for ordering tubes and such for it.
Ok, the bikes are finally finished but I'll show photos of them int the next post. I've been asked to show how I make the circuits for the lights, so this post will be about that.
Here we go!
Here are the calculations for the circuit. It's very basic, Ohm's law and not much else.
Components.
Tools. The lid with some damp tissue paper in it is for wiping off the tip of the soldering iron.
I start by placing the LEDs in the board.
When they're in place, I bend their legs a little to keep them in place. Be careful to not bend too much and damage anything.
Then I cut the legs of the LEDs about a millimeter or so from the board.
Soldered.
When bending the legs of the resistors I bend one first (uhm...don't know how to do it otherwise
), then place the resistor where it's supposed to be on the board to measure where to bend the other leg.
The legs are cut before soldering to avoid the risk of damaging the component or the soldered connection.
Blurry photo, sorry about that! This was just to show that before soldering wires to the circuit, they're peeled at the end and then a tiny bit of solder is applied to the ends to help making a better connection.
Here's the soldered circuit. The resistors for the LED that's going to be in the tail light (those two in parallell) are soldered on this main board so that the tiny board in the tai light only holds the LED and the connecting wires.
Here are the wires for the switch and battery also soldered in.
Cable lugs (correct word for them?) on the wires for the tail light.
Tail light circuit board.
Finished!
Here's a page that explains a basic LED circuit well:
http://unclean.org/howto/led_circuit.html
Hope this can be of any help!