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Joule Thief Toroid not helping to step up, Why? Answered

Hey fellas..I am having problems with joule thieves especially with the toroid part.... First time I wound my Ferrite Core and the joule thief ran smoothly... But recently I had to unwind it to try other wires which didn't work.. So i again wound up the toroid just like the first time when it used to work but unfortunately this time it didn't work... I have checked everything and found that the only problem is that the toroid is not helping to step up the voltage.. When i applied 9V across it, the LED glowed but for 1.5V it didn't. So there is a problem with the toroid.. But what it is and why is it happening I don't know..I mean for the same core and same style of winding once it worked and now it doesn't, Why ?? Can anyone help me ??

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icengBest Answer (author)2014-03-12

Are they wired like this?

Are you using insulated or magnet wire ?

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Arijit Chatterjee (author)2014-03-13

I got the answer... I searched a while on net and found that we have to sort the wires of different coil and that too in opposite direction (That was the mistake i made). I used to sort the wires of the different coils on the same direction.. Later found that if I use one wire of upper side then it has to be sorted with the wire of second coil from lower side... It is running smoothly again... Thanks steve and iceng....

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steveastrouk (author)2014-03-13

What makes you think you haven't damaged the transistor?

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