Joule Thief

[jeanna]

edit You posted the answer to my question while I typed.

thank you,

jeanna

btw please have a look at the drawings and schematic and give your opinion.

[jadaro2600]

On a tangential matter - involving this confusion and more;

Why would there need to be more than one secondary?  Why wouldn't there just be one that went all the way around? or most of the way?

Or is this what all the fuss is about, testing the peculiarities of multiple secondaries?

[jeanna]

Hi Jadaro,

It just doesn't work well or at all, depending on how many turns where they start and where they end.

When you go up then down on one side then cross over then go up then down on the other side you get much higher numbers.
Try it . You will see. I just posted a pic of a MK1 which is much easier and way less confusing  to make than the next in the series. Make one of these and you will have a start. Then it will be time to make a MK2.

It is worth it, even if I couldn't light that string yesterday.

The close-up of the winds on the grey background pictured in the MK2 instructions will give a good detail of the windings of the single stranded MK1. Just don't do the longer folded wire bit.

jeanna

[Mk1]

@jadaro

Because you get current in all secondary , same current ,just more to use.

[xee2]

@ MK1

In these two drawings the pickup coils are not wound the same way. In MK1_coil_instrux.jpg if both coils are considered to be wound from start to finish in ccw direction, one coil is wound "over, down through center, under" and the other coil is woulnd "under, up through center, over". Whereas Jt_Mk2_2.JPG has both pickup coils wound "over, down through center, under" when considered to be wound from start to finish in ccw direction. Does that matter?