Joule thief 6 LED Flashlight Torch

After reading Evil Mad Scientist Laboratories on how to make a joule thief , I decided to resurrect my 1 AAA cell flashlight torch using the joule thief design .

Step 1: Joule thief 6 LED Flashlight Torch

First I made a test rig using a 338 transistor,
6 x 3mm LED's and 11 windings on the toroid.
<p>hi, can u tell me that in your circut design u have used one led and in your build u have used 7 leds..,can your circut design be used to power 7 leds or if not then what are the modifications.,and can u also tell me that insted of using bc549 transistor which else transistor can be used.??</p>
<p>i makeone but it make a 71 to 72 turns of windings and omg!!! to much amp that can kill the transtor if i set a voltage to 3.5 to 4.5 vdc well its good joule thiefe but i remod the system i put some diode zener diod damn the system flow good and to powerfull and i make some minor adjustment i make a crank up dynamo that can generate a lot of voltage to the inverter to the battery and last!!! hook up!!!in the six to seven led that make it super work!!!! that so hell great more</p>
<p>Hmmm, am I the only one seeing seven LEDs in that flashlight?</p>
Hi buju357, <br>please tell me what do you mean 11 windings on the toroid? <br>there are two windings,A1-A2 and B1-B2. Now tell me which is the 11 windings one of these or both?
hi <br>I used 11 winding's for both A and B
thanks :-)
If you would like to make it easier for readers to follow up on your Instructable, please include a few more details such as the final schematic, wire gage for your toroid along with your comments about how well you thought that your project worked...
very very nice. I made one a while back only using one 10mm white led and its the brightest little thing. http://www.youtube.com/watch?v=fcTwhqfUkxk <br>whats the run time on yours?

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Bio: I have a interest in all things related to technology, this includes, computer systems, hardware, software, operating systems and application programs. I design, build, repair ... More »
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