Joule Thief

This is a small little kit that allows you to assemble your very own Joule Thief.
What is a Joule Thief? It is a small circuit that uses dead 1.5v batteries to power a 5mm LED. (A Joule is a unit of energy.)

Works with AA, AAA, C, and D cells.

It takes very little time to assemble, but yields a very neat device! Great for learning about electronics.

Assembly tutorial (Video):
Here
Assembly tutorial (PDF):
Here

Required Tools:
Soldering Iron
Wire Cutters/Flush Cutters
Needle-Nose Pliers
Helping Hands

Included Parts:
1 x PCB
1 x 1k Ohm Resistor
2 x 5mm white LEDs
2 x 2n3904 transistors
1 x Toroid
Green enameled wire
Red enameled Wire
Lead-free solder
Paperclip

Available as an assembled kit, choose either the wire option or the spring clip option.
Note: The assembled option has been optimized to reduce cost, it looks a little bit different from the DIY Kit.
If you are interested in the bare PCB, this is available as well.