The inevitable: I make an instructable on: the Joule Thief.
This is a great circuit to teach children about electronics especially inductors and coiling considerind it contains so few parts and is so easy to make...
Let's get started.
To get us started, I have a video.
By the way: I had forgotten to put the arrows for the LEDs...sorry.
Step 1: Materials, Materials, Materials
1 "dead" battery (with 1 volt left.)
1 2N3904 Transistor
1 handmade inductor or two pre-made.
1 Solderless breadboard