Joule Thief

[turbogt16v]

yes i got it ,thanks

but can you answer 1 more question,

i know that this is not possible because somebody did probably tried this in this tread...

Can you use rechargeable battery and circuit to loop part of current to the battery ,infinite battery

can you please explain it to me simple..

[Pirate88179]

I believe that some folks here were trying that, I do not recall how far they got with it.  If you feed back some of the power, which would be mostly voltage on the output, it seems to me it would only reduce your output and possibly make it run longer but, you can do that by tuning the resistance with a variable resistor.  If you can get some free batteries, then, like me, you don't really care how long it runs.  You probably know a lot of folks that just toss those out when their electronics devices (camera, wireless mouse, flashlights, etc) quit working with them.  There is a lot of energy left in those batteries.

I am sorry that I could not answer your question in more detail.  I believe that Gadgetmall was one of the ones using a feedback circuit.  You could go to his profile and look at his past postings and find the date range that this was being worked on.

Bill

[Pirate88179]

http://www.youtube.com/watch?v=tIF7AylcISw

Two JT surplus flash circuit lights that operate well.  I got the flash circuit boards over at Electronics Goldmine.  These look similar to the old Kodak boards but I could not match it to any schematic but, they were easy enough to figure out how to hack.  So, circuit boards were $.69 each (US) and the wooden boxes were $2.00 each and these lights are great and, although it is not as good as the old Fuji AA boards, it is pretty close.  I can't get those Fuji boards over here any more.

Cheap lights to use depleted batteries...who could ask for more?

Bill

[kooler]

kool..   I got 6-7 of those boards I think.. I try to make me one of those soon..  thanks

robbie

[Pirate88179]

Robbie:

That is good.  Thanks.  I am going to get some more before they are gone...just to be safe.  It was basically just taking the output from where the cap was and shorting the on-off switch and removing things not needed.  I am sure we can get even better performance from these with a little work.

The good news is that they work fine right away.  Knowing you, you will find a way to increase their output.  I look forward to seeing that.

Bill