Single AA battery to light WHITE LED for long-long time

[dog812]

awesome thanks.. Ill take a look.
I am new to building circuits.. is there a palce that i can buy wht i need pre-made?

Or maybe someone can just tell me what i need to do to power 21 LED 3.6V / 30ma   with 1 AA rechargeable.
How long it will last for?
etc....

[Pirate88179]

dog:

Just introduce yourself on the topic there and tell folks what you are trying to do.  Then, go back and read as much of the topic as you can because it is all there. (someone will probably suggest this)  These are very simple circuits and just about anyone can replicate them.  Also, you can check out my youtube joule thief videos if you want.  Many others have them as well.  Some are very basic and simple and some are very advanced.  Just search youtube for my channel: Pirate88179.  I look forward to seeing you on our topic.

Bill

[Goat]

@ dog812

Check out a user named gadgetmall in the above thread that Pirate pointed you to, he has units for sale that will run a long time on 1 AA battery, he has his site in his signature, it's: www.sunpowerwindpower.com.

Regards,
Paul

[dog812]

Thanks for the info.. I just found these joule thiefs today.. so i am deffinetly going to do some research about them..
I had no idea this was even possible.
Thanks again..
any more info to point me in the right direction for my application would be greatly appreciated.

[Pirate88179]

@ Dog:

Goat is correct.  I forgot that Gadgetmall had units for sale.  He really has some great stuff that he has developed and he is a really good guy.  If you want cheap light that last a really, really long time, the joule thief topic is the place to be.

Bill