Joule Thief 101

[MileHigh]

Why don't we just stick to something a bit more tangible?

https://www.youtube.com/watch?v=UGTI5DLM6gQ

https://www.youtube.com/watch?v=1pM6uD8nePo

Clearly many people are not in sync with the concept of a resonating wine glass.  The idea doesn't resonate with them.  How the hell does a bloody wine glass resonate I wonder?  What about a bridge?

[sm0ky2]

@ mags

nice coils!! 


sorry I was away for a few days so I missed your question regarding the two coil examples.

as intuitive at it seems, many do not get that until they actually try to wind a coil
then realize you can't make them "straight" as in your first example, because the core is round.
every coil has some 'pitch' to the coil next to it, and so on.
even if you completely fill the torroid with wire, there is some pitch.
in fact, the degree of this pitch plays a role in the inductance equations.
and is used to determine the electromotive force vector of the angular current.

[sm0ky2]

Here's another different form of resonance that I found very interesting to ponder.
https://www.youtube.com/watch?v=IiLplTc8rQY


It would appear that life itself relies on resonance in one form or another.
Cheers

as does the existence of matter itself.

and, to a much greater magnitude, entire areas of our known universe.

[MileHigh]

Look at this, vibrating reed tachometers, a.k.a. vibrating reed frequency meters.

https://www.youtube.com/watch?v=s5wgwvT8boc

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

They used to put them on big backup diesel generators for buildings with vibrating reeds spaced very close together in frequency.  That way you could see how close your backup generator was to generating 60 Hz or 50 Hz AC mains frequency under load.  For all I know they still use them for big backup generators unless they have been all replaced with electronic frequency counters with digital displays.

How do they do it?  Judging by the 64 pages of this thread, nobody has a clue how they do it except for me.

[hoptoad]

Why don't we just stick to something a bit more tangible?
snip..
  How the hell does a bloody wine glass resonate I wonder?  What about a bridge?

Why don't you just do something tangible and provide answers to your own questions?