Joule Thief 6 LED Flashlight Torch




Introduction: Joule Thief 6 LED Flashlight Torch

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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 .

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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.

Step 2: Joule Thief 6 LED Flashlight Torch

Then I compacted the parts ready to fit into the torch.

Step 3: Joule Thief 6 LED Flashlight Torch

Then fit it into the torch,

Step 4: Joule Thief 6 LED Flashlight Torch

The final product

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    8 Discussions

    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.??


    5 years ago on Introduction

    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


    5 years ago on Introduction

    Hmmm, am I the only one seeing seven LEDs in that flashlight?


    6 years ago on Introduction

    Hi buju357,
    please tell me what do you mean 11 windings on the toroid?
    there are two windings,A1-A2 and B1-B2. Now tell me which is the 11 windings one of these or both?


    Reply 6 years ago on Introduction

    I used 11 winding's for both A and B

    Dave Kruschke

    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.
    whats the run time on yours?