Make a joule thief

Posted by Ilias-Man On Monday, February 20, 2012 60 comments
Joule thief is a simple step up converter, that converts DC to DC, for example you can drive a 3.4V Led with single 1.2V battery, even if the battery is almost dead. It extract all the energy stored in batteries.
You need:
  • 1Kohm resistor.
  • small NPN transistor ( for example 2N3904 ).
  • ferrite toroid, (can be found on power supplies, radio), and wire to wrap around the toroid, ( big toroid and more turns = more output power and voltage you get ) the method of wiring is shown under, (if you don't have the toroid try the other methods under).
  • and Led or anything you can't drive with one battery like: leds, lighting a neon lamp, charging capacitors with high voltage, charging other batteries Ex: charging 3.6V batteries with 1.2V battery...



you can change the 1.2V battery with 9V to get high voltage output that can drive neon lamps...
you can charge batteries...



A demostration:



A different types of coils can be used




Thanks

60 comments:

Wellington Taylor said...

This is certainly one of the most valuable posts. Great tips from beginning till end. Lots of suggestions for me and for people. Superb work

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wantoro said...

good .... must be tried :d tanks guys

SABIR ANSARI said...

interesting and funny

Sharon Clark said...

Seem to be a good project. Power efficient, especially if you have open sign with less than a hundred of leds.

Finn said...

Amazing Content!! Really I was confuse on the same but now satisfied, I was visit one more website like you circuit design.

Tech Hive said...

Good and Easy explanations Make a joule thief Circuit. i like and more Electronic Circuit Project Publish on this blog. Thanks again...

Keshav Batra said...

Isn't. That wrong that u hv written that it converts dc to dc . It inverts the signal ie. Ac to dc right? Must reply

Elektronika said...

well..testing and and works.tnx

enceng sanksank said...

Kalau untuk menyalakan lampu neon 220volt bagaimana?

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