Joule Thief 101

[Magluvin]

What determines the resonant freq of the wine glass?  I know that what they call crystal has lead content. That would lower the freq by adding weight. So I wonder if a wine glass without lead also rings, but we just cant hear it because the freq is too high?

Mags

[tinman]

 
  End of story!

   
          John.

Just say a particular frequency when the reactance of an inductor and a
  capacitor balance.

But MH insists that there is no C value in a JT--it just an IR system.

Tinman science and MarkE science are worlds apart.

Not as much as you may think

When I'm flying I go by the book, as a fellow pilot I'll bet the
   Koala would agree.

Good thing bird's cant read,or they'd have to attach wheels.


Brad

[tinman]

MH,

How do you define the preferred rate in scientific terms?

How do you define the natural rate in scientific terms?

I mean, could you say that the preferred internal rate of action\reaction to an external stimuli,, or should it be stated some other more precise way?

I mean, could you say that the natural internal rate of action\reaction to an external stimuli,, or should it be stated some other more precise way?

Besides stating the obvious that at resonance part of the external input is being stored within that component that is in resonance, or being destroyed, as in being converted into wasted energy, aka heat.

It does appear that no matter what the answer given you will simply be saying it is wrong.

http://www.intuitor.com/resonance/index.php

Indeed


Brad

[MileHigh]

Here is an interesting quote that Mark Dansie posted recently for y'all to contemplate:

"We are all capable of believing things which we know to be untrue, and then, when we are finally proved wrong, impudently twisting the facts so as to show that we were right." George Orwell

[Magluvin]

But MH insists that there is no C value in a JT--it just an IR system.

Brad

There is definitely a C component within the coil. I did post, probably not in this thread, scope shots of a monofilar coil and a bifilar coil and the freq they ring at. The bifi was lower in freq, more likely due to more internal capacitance. The bifi was I believe near 14khz

The Jts freq testing so far is very high with low numbers of turns. One I have found at near 3mhz, of which I havnt reached that freq of operation with the circuit so far.

Mags