Joule Thief 101

[minnie]

  There ya go tinman, EEVBlog 140 and 141. Just sit back and enjoy a fellow Aussie.

[AlienGrey]

This might interest you, have a look at this video it appears to run for ages on the vid but i'm sure you can pick it apart.

https://www.youtube.com/watch?v=EjJ1iVNHd4s

[AlienGrey]

This might interest you, have a look at this video it appears to run for ages on the vid but i'm sure you can pick it apart.

https://www.youtube.com/watch?v=EjJ1iVNHd4s

[MileHigh]

The long wire-wrapped cylinder running through the center of the toroidal transformer is almost certainly is a piece of electronics quackery.  Some simple tests could be done to easily confirm that.  However, it would seem that none of the "bench doers" have anything to say about that.

Note that the main toroidal transformer configuration does not resemble a Joule Thief transformer.  It's possible that when the transistor switches off it gets fried by the magnetic energy stored in the toroidal transformer but all of that would have to be confirmed on the bench.

I suppose the most important "armchair takeaway" is that the assumption is that the cylinder running though the center of the toroidal transformer is quackery.  I am sure that Dave Jones from the EEVblog would have something colourful to say about it.

[gnino]

https://youtu.be/oejW6bEnCZc
https://youtu.be/KPTW68qVJTU