This is one simple joule thief that is slightly different from the conventional design where it uses 4 Inductors. It can light up 24 LEDs using 1.4 volt of AA battery...
https://www.youtube.com/watch?v=S8cplXgAvUw (https://www.youtube.com/watch?v=S8cplXgAvUw)
I am looking for a better improvement if it can power the circuit using the lowest amount of volts like 200 mV...is there anyone have idea how it can be done.