The old transformer.
Free Energy 1.5V to 10W Led !!! Increadible !!! Overunity circuit Have Fan !!! Joule Thief 1.5V AA Battery can powered 10W 12V Led !!! Its Amazing Circuit !
1.5V Transformerless Joule Thief to 10W 12V led - very, very, very interesting. circuit! ;-)
here is the demo how joule thief works to light an 12 volt led this is by far the best of this circuit. The new version link below .