Nothing new here found this on instructable web site I was searching on google for higher power joule thief and I found this page with very good instruction on this little circuit witch boost up the efficiency and also prevent you from burning your precious LED. Hope you like it and thanks for watching.
Here is the link to the original site
http://www.instructables.com/id/The-any-value-Joule-Thief-Single-AA-high-power-w/
