Want a Joule Thief circuit in a slim shiny package? Scoring serious geek points is high on the agenda of the forward thinking tinkerer, and what better way to do so than with the recycled innards of a floppy drive, toy motor or precision stepper? None Spring to mind... So with that ..in..mind.. Lets get on with it.
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 in but it will probably require a bit more room than is easily available so you might lose out on Prettiful Points. If you want to go with a normal joule thief circuit I recommend 1up's excellent Instructable here. Since the Circuit build has already been covered many times before I will focus in on reusing the motor and quickly cover the rest of the circuit. If you need help please leave a comment.
For a few more pictures and discussion please see my blog post