Joule Thief 101

[MileHigh]

Bill:

This is probably the best film you will ever see on the Tacoma Narrows bridge:

Galloping Gertie - The Collapse of the Tacoma Narrows Bridge

https://www.youtube.com/watch?v=KqqyAZDpV6c

What's truly amazing is that I think it was done by high school students.

It's so good that I will give them credit right here:

Galloping Gertie -- The Collapse of the Tacoma Narrows Bridge examines the creation and demise of the original Tacoma Narrows Bridge. Produced by Koyo Kim and Raluca Ifrim for National History Day 2007.

From WSHS' collections. Catalog ID: 2011.41.1.2

There are a lot of lessons to be learned in this clip and they can be applied to this forum and to this very thread.

MileHigh

[Pirate88179]

MH:

I saw that one listed (But had not watched it) and posted the link to the other as it was shorter.

You are right...that is even better than the film we watched in class on this event.  Very well documented and explained.  A very good job.

Bill

PS  I like how the expert outside consultant said:  Naw...it will be fine, don't worry about it.  Ha ha. (Or something like that)  I wonder if his liability insurance went up after this?

[sm0ky2]

It is important that those thinking along these lines grasp the concept entirely.

"what is" or "what is not" resonance.
This can be the cause of a great deal of confusion.

Synchronization, or Timing of the components of a system, while may be required for total system resonance, these are independent concepts.
timing can be coordinated at virtually any range of frequencies, velocities rpm, etc.

resonance results in things like TK shows with the bridge above.

the inductance, number of turns in the coil, resistance, transistor function
these things are the "timing".

resonance has to do with the length of wire in those coils, vs the physical size of the ferrite (times a materials constant)
vs the comparable impedances and capacitances in other parts of the circuit.

when both of these line up together in just the right way, we see things like TK's bridge example, occurring in our circuits.


PS: if you want to see an "ICE in resonance", sit behind a large diesel truck on "just the right sized bridge" for long enough, and the whole bridge will start to bounce

[sm0ky2]

pay no attention to the man behind the curtain

[tinman]

author=MileHigh link=topic=8341.msg476060#msg476060 date=1456885282]


       

MileHigh

You can stew in your juices for a month or two and I will answer then.

You give your self too much credit MH. Believe me when i say that there will no stewing here ,other than to cook my wife a nice meal. I need not your answers MH,but i am surprised it would take you so long to carry out the research needed by your self to put the answers together.
[/quote]

Sorry, but your BS has been exposed.

Those that read this thread will see where the bullshit is coming from MH--let them be the judges of that.

Here you are arguing about resonance and you can't even explain what it is for a bloody wine glass.

I have answered this question many time's MH,but as you have done in the past(many times on this thread alone),you miss it,and then accuse people of not answering questions.
I have proven you wrong time and time again on this thread alone--it's all there to see,and people can judge for them self.

The whole debate with you has been an exercise in BS and bluster and the usual baiting and switching.  It's been a farce.  I have seen it many times now.

Ah,so you do look in the mirror MH.
The facts are(and are written in this thread for all to read),i gave an accurate description as to how a JT operates at low voltage potentials--you couldnt even give it a try,because you had no idea>--you admitted to this
Then i had to set you straight about the resonant systems in an ICE-->as you got that wrong as well.
There is also the fact that you cannot answer your own questions(not one)--which i have accurately.
You cant grasp the fact that resonance can increase system efficiency's --even though many examples of such have been provided. Some devices will not even work outside there resonant frequency. Im not sure who it was,but i believe some pages back i saw some mention a pulse jet engine. The valveless pulse jet engine always runs at it's natural mechanical/acustic  resonant frequency.

Even alleging that I can't answer my own questions is just a BS charade once again in an attempt to save face, because you know I can answer them.Delivery in four to eight weeks.

Dropped your self in that pile-didnt you MH.
Some one that has answers dose not need 4 to 8 weeks to answer them lol.
Some one that has no answers would require such time to gather the information needed to answer such questions
Curve ball-->You can stew in your juices for a month or two and I will answer then
Predictable from some one that cannot provide the required information.

Post 557 :Also work on your personal integrity with that farce of a response from you about the resonant frequency of a wine glass.

Current post :Delivery on answers in four to eight weeks

Lol

First you want to know how a wine glass resonates  .
Then you want to know what determines the resonant frequency of a wine glass-->how long is a piece of string question:D
Now you want to know what is resonance in a wine glass
The last question you only ask in the post of this reply,and yet say i have not answered it
You need to work out what you want to know MH,and i will give you the answer--but only if the question can be answered with the provided information--none of your incomplete or loaded questions will be taken notice of from now on MH. So please provide all the required information about the systems parameters,so as we can make an accurate working description--you know,just like you ask from us.

Resonance in a wine glass ,is the wine glass vibrating at it's natural resonant frequency
Now i have highlighted that in red,in the hope that you dont miss it.

Now-do you think that a JTs core will be vibrating at it's natural resonant frequency?
What impact would it have on the efficiency if the running frequency is the same as the NRF of the core?.
Dont worry about trying to answer those questions either MH,as we dont have 12-18 months to wait


Brad