Make a joule thief

Posted by Ilias-Man On Monday, February 20, 2012 27 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



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


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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