We have Joule Thief kits in stock. This also includes our new high power Joule Thief Kit that includes a Cree XLamp 1 Watt white LED. We ship all over the World.
For a fully interactive simulation; visit the forum at http://madscientisthut.com/forum_php/viewtopic.php?f=12&t=3 to download the simulation files, a link to download the free LTspice simulation software, and to see the joule thief schematic (the download is near the bottom of the page).
I did the Joule Thief simulation graphics again. I wanted to make them a little better this time. I added some arrows on the schematic to show where the simulation graph values are coming from, I hope this helps. Click on the image, then click on the next page image for a full size version ( I still have to figure out why you have to click the image twice to get a full size image )