We had some high permeability toroid cores shipped in. The permeability is so high that it can achieve somewhere between 3-5uH per each winding. This allows for us to make a High Power Joule Thief with just one winding on each side of the transformer.
The new one winding Joule Thief is very stable, starts up at below 600mV, and runs very bright at 1.5VDC leaving spots in your vision if you happen to glance at the LED while it is on. These units are assembled, tested, and can be purchased here.
Here it is running off of a single AA battery.
Introducing the Cree 1 Watt LED High Power Joule Thief Kit
We are very excited to introduce our newest Joule Thief kit. This kit is a higher power Joule Thief kit that includes a Cree 50 Lumen XLamp 1 Watt white LED. See our energy harvesting product section to purchase this kit .
You can also purchase these Cree XLamp XL LEDs as an individual unit by going to our components section.
This Joule Thief Kit is available as a thru-hole board kit. This kit allows you to substitute components and includes all parts and a quality PCB. The PCB is double sided with extra copper around each hole on both sides, all traces are redundant top and bottom of the PCB. The PCB design allows for the components to be replaced many times as long as good soldering practices are followed. Substituting components will allow the experimenter to try for different voltages or efficiency.
* 40 inches red magnet wire
* 40 inches green magnet wire
*1ea – NPN TO-92 transistor
*1ea – torroid
*1ea – 1/4watt axial resistor
*1ea – PCB
*1ea – Ultra bright white LED
BIG educational discounts on kit quantities of 20 or more. Educator kit also includes 1 assembled and tested Joule Thief, please contact us at firstname.lastname@example.org for more information on customized kits.
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 )