Joule Thief

[Qwert]

While I'm wandering at ancient threads of this forum, I've stumbled upon this post, where a guy named "kames" refers to a guy named Zoltan Szili and his circuit. I guess, it can be related to the spirit of this thread:

http://www.overunity.com/712/the-master-of-magnetics-steven-mark/msg4638/#msg4638

here is this circuit and accompanying text:
https://docs.google.com/document/d/1UiMUcZ1JZc1YDUt5Z6SCas-3qV0fLX14qanxFULQSq4/preview?pli=1

[bs2012]

Hi .. That is very similar to My circuit posted several pages back . i use the base emitter to obtain a 1/2 ua current draw for a what led . That circuit will blow white leds with a charged 1.2 battery thus the need for a high resistance pot  ..

Do you mind post the link to that page or post the circuit again.  Many thanks.

[gadgetmall]

Do you mind post the link to that page or post the circuit again.  Many thanks.

Hi . It has been Modified by Tk also . your is slightly different too.

[xee2]

Timed rundowns from known voltage levels provide a good measure of total input energy and average power dissipation over the timed intervals.

Excellent video. That is a nice clock to have. You may want to look at the equations in this video for how to compute average current from capacitor voltage change >> http://www.youtube.com/watch?v=LQinhM1CxkM

[gyulasun]

Good stuff Tk.

Anyone want to try one of those LED "shaker torch" things with this?
http://www.amazon.co.uk/Rolson-Tools-60753-Shaky-Flashlight/dp/B000WDTIEO/ref=sr_1_1?ie=UTF8&qid=1354964803&sr=8-1

Be careful with the buying of such shaker torch lamps because in 99% of the cases it does include two CR2032 type button cells! And it does NOT include any supercap, only a 47uF or 100uF normal electrolytic capacitor if at all.
(Just read one of the costumers letter: the lamp was left accidentally ON for one and a half hours and still was ON without any shaking.)

Gyula