Joule Thief 101

[MileHigh]

MH
You keep quoting Karma
and yet your motives for this entire Wineglass fiasco are quite obvious ,and have zero to do with teaching or doing the right thing
and everything to do with "look at me"  and Bow to my superiority ...

Go jump in a lake as far as I am concerned.  Your non-technical colour commentary is useless and if you endorse what Johan did then bow your head in shame, truly.

_You_ are living for _this_ moment.  You are a blazing injustice warrior.

[tinman]

I don't know, do you?

If however CH2 on your scope was not set to "INVERT" mode, it would appear that way wouldn't it?

Perhaps CH 1 was inverted,or you are looking at the winding directions of the coils in the pic-that may not represent the actual winding direction of the coils,as not dot convention is depicted on the two transformer coils?. Regardless of polarity,it is more associating the rising and falling current value to that of the rising and falling secondaries EMF value. <ost of us here were able to determine that the scope shot was correct-in that it showed that at the point of maximum rate of change in the magnetic field(determined by the current trace at the 0 volt line),we see a maximum EMF amplitude across the secondary coil,and that the phase difference of 90* is correct.

While you are here,could you answer a simple question?.
What is needed in order to cause a change in impedance in a transformer,where that transformer has a primary and secondary winding,and is of an air core type ?.


Brad

[MileHigh]

Please go ahead Brad, I would like you to tell me what you think is wrong with my two answers.

Here they are:

How does a wine glass resonate, what is the mechanism?

The wine glass resonates by cycling energy back and forth between two forms, kinetic energy and potential energy.  The instant when the glass is not deformed, the glass is moving at a maximum velocity and all of the energy is stored as kinetic energy in the form of a moving mass.  The instant when the glass is at its maximum deformation, the glass has stopped moving and all of the energy is stored as potential energy in the form of a compressed spring.  In between these two states, the energy is stored as combination of kinetic energy and potential energy.

How is the resonant frequency of a wine glass determined?

The resonant frequency of a wine glass is determined by a combination of the effective moving mass of the glass and the effective stiffness of the glass interacting with each other.  The higher the effective moving mass of the glass, the lower the resonant frequency.  The higher the effective stiffness the glass, the higher the resonant frequency.

[tinman]

.[/b]  The answers are perfectly accurate.  About half a dozen times I stated the answers had to be short simple answers in four sentences or less.  What can't you understand about that?

More embarrassing stuff.  Yes phase, but not necessarily phase.  Take little tiny baby steps Brad and you will get there.

I told you if you wanted to be serious you would do a full power audit for both cases to understand what was going on but I assume that you didn't.

It's embarrassing how ridiculous and awful your behaviour is.  The answers are correct

Lets look at your !big reveal! answers then.
Post 1847.--The wine glass resonates by cycling energy back and forth between two forms, kinetic energy and potential energy.
This part is good.
The instant when the glass is not deformed, the glass is moving at a maximum velocity
This is correct as well
all of the energy is stored as kinetic energy in the form of a moving mass
This is  incorrect,as some of the energy is dissipated while the mass is moving -in simple terms,in way of sound waves.
The instant when the glass is at its maximum deformation, the glass has stopped moving and all of the energy is stored as potential energy in the form of a compressed spring
Well i see at this !instant! point in time,you have correctly stated that the glass has stopped moving-!BUT! not all of the kinetic energy is stored as potential energy,but more so the remaining kinetic energy is stored as potential energy. But at this very point the glass stops moving,is the very point when a vibrational wave is created,and so at the point of kinetic to potential energy transformation,a small portion of energy is dissipated as vibrations.
It is also funny how you have used the term!compressed spring!,where a spring has very little stiffness,but a high value of elasticity--something to think about
In between these two states, the energy is stored as combination of kinetic energy and potential energy.
Not all the energy is stored,as some is dissipated-as i explained above.

The resonant frequency of a wine glass is determined by a combination of the effective moving mass of the glass and the effective stiffness of the glass interacting with each other.

Almost MH,but you needed to add in the environmental conditions as well--to be accurate,as the wine glass would also have to include the atmosphere that is both inside and around the wine glass as effective moving mass,along with being an effective resistance as well--none of that in space  --but we wont get picky now.

The higher the effective moving mass of the glass, the lower the resonant frequency.  The higher the effective stiffness the glass, the higher the resonant frequency.

See,now here is where you went from compressed spring to stiffness. The correct term(and this is the scientific term MH)is elasticity of the glass--not stiffness,as when you use the correct term!elasticity!,then the elasticity value has to decrease in order for the resonant frequency to increase,where as your !!stiffness!! has to increase in order for the resonant frequency to increase

These were your answers MH,and you said that all of ours given were wrong,and yours was going to be absolute,and correct.
If you are going to make a claim like this,then you need to be 100% correct-even in a 4 sentence explanation. But as you can see,you were not,and that is fact MH.
If any one of us had of put up answers like that,after dismissing everyone elses,then you would have picked us apart--as you generally do.
So the same applies to you--you were not 100% correct MH,and all that you have provided had been already stated many times in the thread.


Brad

[MileHigh]

"It is also funny how you have used the term!compressed spring!,where a spring has very little stiffness,but a high value of elasticity--something to think about"

Oh yeah, that's really something to think about Brad.  The reason you are so freaked out is because I have been calling you out for statements like that.

This time, let's see if any of your peers would be prepared to comment on your statement above about the spring.

I will respond to the rest of your comments later.