Joule Thief

Goal

 * Learn a way to use end of life batteries

Level

 * You should already have done something on breadboard, it would make your life easier. But it's still nice as an introduction to it.

Component

 * A ferrite core
 * Some cable to do the solenoide
 * a resistor (We don't really care about the ohm, between 100 and 400 should do the trick :))
 * a simple led triggered by 1.4 volts
 * a PNP transistor (in this case the 2N3904)

How to
The circuit is as followed : Joule_thieve.jpg More picture will follow