This ible will entail how to solder a joule thief together from www.thejoulethief.com. They cost $7 each.
The kit from thejoulethief is interesting in the fact that it deviates from the standard bulky joule thief design to a small and compact pcb layout with a few extra components for efficiency.
Step 1: Open Source
Step 2: Gather Parts
Qty 2. Transistor
Qty 2. 1k resistor
LED (your choice of color)
Qty 2. wire pieces
Step 3: Inductor
Insert the inductor, bend the leads so that it says put, and solder it in.
Step 4: Resistors
R1 is the 2.2k resistor (red red red).
R2 and R3 are the 1k resistors (brown black red)
Note that you should mount the resistors vertically to save space.
Insert, bend leads, and solder!
Step 5: Capacitor
Step 6: Transistors
After bending the leads, carefully push down the transistor into the pcb until it seats nicely. Solder.
Step 7: LED
Step 8: Wire
Next it is time to test it out!
Step 9: Testing
This is a great way to get compact LED lighting, using a minuscule circuit and one AA battery. The circuit operates off of "dead" AA batteries, making it a great way to reuse your old AAs.
Pick up a kit at www.thejoulethief.com and have fun!