Joule Thief 101

[MileHigh]

Miles
How does your whineglass Karma  lesson change Tinman's methods for tuning to resonance  ?

How could this lesson improve or change his technique ??
??

You have to be aware that there are always two components to think about when it comes to resonance.  Just saying "it resonates" doesn't cut it.  Maximum resonance amplitude when you factor in losses equals a maximum power burn-off.  Where and why is the energy being lost, by what method?

Smoky talks about "making your Joule Thief resonate at the same resonance frequency of the toroid."  How does the toroid resonate, what are the two components?  What are the magnitudes of the variables associated with the two components?  If one of the components is a five nanofarad capacitance, how much energy can be realistically stored in a five nanofarad capacitor?  If the resonant frequency is very high, that will naturally filter out any amplitude in the variables because all components eventually become subject to low pass filtering which reduces all high frequency amplitudes.  So how much energy can realistically be stored in a self-resonating toroidal core that forms part of a Joule Thief?  Then if the Joule Thief itself is "supposed" to resonate, and that is supposed to be at the same resonant frequency of the toroid and that is a very high frequency, then this is what follows out of that:  There are two energy storing components and two variables associated with the toroid, and two energy storing components and two variables associated with the Joule Thief windings.  Those four components and four variables that are supposed to "sing together."  How do you measure them, how do you see them interacting?  Take one step back, plot the four variables for the four components on a timing diagram by hand and try to construct your "magic resonance."   How much energy is there in each tank and why should two resonant tanks do something special?  Assuming the two tanks are running at a very high frequency, will they spontaneously gen-lock or will they just beat?  If they just beat then "making the two resonant frequencies the same" will be impossible for all practical intents and purposes.

The point of the exercise is to be conscious that there isn't "just 'resonance.'"  There are two energy storage components and two variables and you have to be aware of what is going on.  Just twirling pots and "looking for a big increase in amplitude" is not going to cut it.  Prove me wrong if you disagree.

Resonance is an explicit physical process and on your bench if you are going to be "researching resonance" then you should be aware of all aspects of that physical process.  Clearly, everyone that tried to answer the two questions either only got half an answer, or they said nonsensical gibberish, or they wrote a small book that was ridiculously complicated and philosophical.  Nobody just laid it on the line for the wine glass because they clearly did not understand the simple process that was taking place, and it is the same simple process that takes place for all forms of resonance.  It always has the same signature.

Instead, we saw a grotesque spectacle of ignorance, stupidity, lies, anger, willful ignorance, willful stupidity, gross exaggeration, misdirection, and petty bullshit.  We saw everything except a nice clear answer to the two questions that demonstrated that the person answering had a clear understanding and a command of the subject matter.  Instead of a fun challenge and an opportunity to learn, we saw garbage and the worst behaviours coming out in people.

MileHigh

[MileHigh]

Webby:

As far as your lame attempt at answering your own questions without repeating what had already been posted,,, just have another googlegasm.

Lame my ass, you are still being an ass and not telling the truth about my answer.  Go find a single posting from someone that answers both questions correctly.  Like I already said before, just a Google copy/paste does not count.

The first person to go to the dark side was Brad. If you had a spine you would have called him out for his outrageous behaviour a long time ago.

MileHigh

[MileHigh]

No, it is elasticity as Brad has said...measured by Young's Modulus.

Bill

Stiffness factors in the shape and size of the object being considered.  The correct word is stiffness.

But in this case, just getting the concept across is what counts, that's what's important.  In that sense the choice of term, springiness, stiffness, elasticity, is not so critical, understanding what is going on with resonance is what is critical.

How does a bell resonate, what is the mechanism?

Answering, "You hit a bell at it's resonant frequency and it starts to resonate" is not an answer.  It's a bloody joke that shows that you have no clue what you are talking about.

[Magluvin]

No, it is elasticity as Brad has said...measured by Young's Modulus.

Bill

Ah. I was thinking of the old modulus. Im sure everything has elasticity by some measure.  But isnt it the tensile strength that determines that measure? Just of the top of my head here, not looking anything up on that. Yet.

Mags

[Magluvin]

That glass in the glass breaking video had shown some 'extraordinary' elasticity.

Mags