Joule Thief 101

[tinman]

Under what circuit conditions and measurement points do you see this occurring?

Please illustrate:
a) frequency of operation
b) inductance and resistance of primary/secondary (50mH?)
c) measurement points and phase condition of scope channels and inversion settings.
d) output resistance of FG or signal driver (50 Ohm?)
e) secondary loading (if any)

The phase relationship between primary and secondary voltage is dependent on frequency, inductance, resistance, and coupling factor, so the above parameters are important in determining the phase.

Exactly.
It dose exist,and the phase relationship can be changed.
It is not a mythical creature as MH says,nor dose there need to be a difference in time for each cycle of each phase,only a difference between point arrival of each phase at a specific  point during each cycle ,where by phases cycle time is the same.


Brad

[tinman]

Here you go MH:

http://www.dictionary.com/browse/elastic

The stiffness of the nail precludes it from bending when I strike it with a hammer,, but it does not return the nail to its original shape when I bend it.

Resonance is a special condition that happens all over the universe

https://en.wikipedia.org/wiki/Resonance

Now there you go so that you can learn more about resonance.

The stiffness of the nail precludes it from bending when I strike it with a hammer,, but it does not return the nail to its original shape when I bend it.

Exactly Webby.

Soft iron may have a high value of stiffness,but a very low value in elasticity.

As i stated in one of my replies to MH-long ago,the makeup of the glass(crystal)will determine the value of elasticity,and it is that value of elasticity that will determine the resonant frequency of the wine glass. Even with keeping to the same size and shape of wine glass,we can raise or lower the resonant frequency of that wine glass by changing the value of elasticity in the glass-change the type of glass used.

Brad

[tinman]

So, in a manner of speaking, in elecronics, resonance would be comparable to a battery or capacitor in that, you do not get out any more energy than was put into the system.  Would this be more or less correct?

I heard a guy on his youtube video "claim" that when he hits resonance in his circuit, that amps and volts go to infinity.  Now, I am not sure just how you could measure infinity amps or infinity volts...he was just using a DMM.

Bill

Resonance !can! increase a systems efficiency--this has been proven many times here on this thread now. In some cases,resonance can also decrease the efficiency of a system,and by researching what and where that !bad! resonance is,we can change things in that system that eliminates the !bad! resonance,and once again increase the efficiency of that system.

To make it clear--when i say increase  efficiency,i mean converting one energy source into a wanted second energy source,as we all know-no matter what,each system must run at 100% efficiency-->if we are to believe that energy can not be neither created nor destroyed-but only transformer from one form to another.

Brad

[poynt99]

Exactly.
It dose exist,and the phase relationship can be changed.
It is not a mythical creature as MH says,nor dose there need to be a difference in time for each cycle of each phase,only a difference between point arrival of each phase at a specific  point during each cycle ,where by phases cycle time is the same.


Brad

Since you did not mention anything of the parameters I asked for, do I assume correctly that you do not wish to discuss this any further?

[Magluvin]

Exactly Webby.

Soft iron may have a high value of stiffness,but a very low value in elasticity.

As i stated in one of my replies to MH-long ago,the makeup of the glass(crystal)will determine the value of elasticity,and it is that value of elasticity that will determine the resonant frequency of the wine glass. Even with keeping to the same size and shape of wine glass,we can raise or lower the resonant frequency of that wine glass by changing the value of elasticity in the glass-change the type of glass used.

Brad

In ninth grade our science teacher told us that glass is a liquid.  He had shown us the glass panes in the window frames of our classroom and at the bottom the glass was thicker and a bit of a roll to it. It was an old school. Old enough to show over time that the glass affected by gravity will droop over time.

The effect is slower than molasses from the freezer.

Mags