With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
We have a be nice comment policy. Please be positive and constructive.
We noticed you attached photosto your comment.
I've been playing with the circuit and believe I've found some indications as to how to reduce the current used. However, I have not found how to use a battery below ~ 0.6V since the circuit needs somewhere around 0.6V to start. Once started it can run to about 0.4V. You could use two batteries at 0.55V in series. See my site http://cs.yrex.com/ke3fl and search for "Joule Thief" to find the link to my JT page to see what I've found so far. I'm still working on it. -March 2014
Check out my web page on this, it was a question I was interested in and have tried a few things to see what makes it better, uses less current, to run the white LED. I'm not done yet and will be trying a combination of changing the total number of windings and then also decreasing the number of windings going to the base of the transistor. My web page is: http://cs.yrex.com/ke3fl then search on "joule thief"
3W LED Strobe - 2 AA Batteries and Joule Thief
Joule Thief LED Night Light
DIY How To Make Joule Thief With ( Diagram And Full Detail )
Super Simple Inductor Joule Thief!
Yet Another Joule Thief Tutorial
High efficiency regulated Joule thief
high voltage joule thief!
Building a Joule Thief
Joule Thief 10x10 LED Lamp
Joule Thief Low Voltage Battery Charger
DIY Hacks and How Tos
Posted:Mar 1, 2010
Join 2 million + to receive instant DIY inspiration in your inbox.
Download our apps!
© 2016 Autodesk, Inc.