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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"
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Posted:Mar 1, 2010
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