Wiimote Project

i was trying to make rechargeable ir pens, when i noticed rechargeable are only 1.2 volts probably lower voltage so the can charge from lower voltages... but ir leds (tsal6400) need 1.6 or 1.5 utleast, so 1.2 doesn't do it. ofcurse you can use 2 in series but that takes up more space in the pen and requiers it to be larger and/or thicker...

so i thought that a joule thief can solve the problem, it works like a transformer you can read and see what is it here @ make magazine http://blog.makezine.com/archive/2007/11/make_a_joule_thief_weeken_1.html & herehttp://www.bigclive.com/joule.htm
it can be used to run a blue/white led with even 0.35 volts so it might just do it for the 1.2 volt to 1.6...and u can make really tiny once too il check it out and post here....

edit: here is some more detail info. http://www.evilmadscientist.com/article.php/joulethief

well i tried the 1.2V with the tsal6400 and it just dose not light, could there be another reason?! did any1 manage to get the tsal6400 working with a 1.2v?