This project is basically a "Joule Thief" but with more scrap parts reuse and unfortunately less efficiency. The basic Idea is to use the core of a motor as both the "toroid" part of a "joule thief" (with the rest of the circuit concealed in and around it) and as a nice light reflector (which , if you have access to a pancake motor, is conveniently reminiscent of a flower or the sun).
As previously stated it is very inefficient, and the reason I chose to do it this way is that it uses an otherwise scrap part as a functional and decorative component. Obviously, if you so choose, you can put a hand wound toroid
For a few more pictures and discussion please see my blog post
Step 1: Bill Of Materials & Equipment
1 x 1k resistor
1 x NPN transistor (the 2N3904 is adequate, however 2N4401 or PN2222A will give better light output)
1 x LED
- x Enamled Copper Wire (0.315mm is fine)*
1 x Reasonably sized electrical motor. DC and stepper motors are both fine.
*(other insulated wire should work fine, I used this and it looks OK)
Soldering Iron & solder
Needle Nosed Pliers/tweezers