Joule Thief 101

[allcanadian]

It's nice to see the JT threads are still active and I remember the good old days when it was first introduced here. Not long after a man named Dr.Stiffler appeared for a while with a variant and I found one of his oscillators I bought under my bench collecting dust only a few weeks ago. It was basically a glorified low power high frequency JT in my estimation from the testing I did. The work I posted closely related to Stifflers designs was then borrowed and morphed into the infamous Slayer circuit. Strange how I had numerous slayer circuits built and tested at least a year before he supposedly "invented" them, lol, such is life. Even more curious is that the odd article still pops up by some EE or electronics expert claiming they don't really understand it and that it is a marvel of engineering.


A few tips, early on I found the base or gate resistance dissipates as much energy as the load in some cases. LED's on the base lit almost as bright as the supposed load so a series cap should be used. I transitioned to open gate mosfet switching with a bare wire on the gate not attached to anything or the gate wire wrapped around the insulation of a HV secondary. This design morphed into self-oscillating(self-switching) SS HV induction coils not unlike a Rhumkorff or Tesla coil. It's odd that so many consider parasitic capacitance, a ridiculous term, as a problem when in many cases it is the best solution if not the only one.


How do you switch an external electronic circuit when the primary circuit your trying to synchronize to is blowing off 12" arcs in every direction, inducing ridiculous voltages in all nearby open conductors?... the answer is you can't to my knowledge. I had random nuts and bolts and wires scattered on the bench arcing over up to 1" apart like a christmas tree three feet away from my quite unique oscillator. I wouldn't put any oscilloscope within 20 feet of that infernal machine and it made my Tesla coil look like a fart in a windstorm. Good times back then, exciting times and there was a lot of crazy shit going on, a lot of creativity and as always a lot of wild ass speculation.


In any case...play safe.


AC

[ramset]

Mags
we know things come apart at resonance ,we know plain heat will do like wise ,as well as the hammer shown here

https://www.youtube.com/watch?v=XC6I8iPiHT8

and we know energy is released...

The Bug above hunts with Photons which he Knocks out of orbit ,he messes with the wheel work of nature so he can get a meal.

as Smoky has said, it would seem the education process has purposely kept different fields of science separated
by "specialty" or Box.

when it would seem that there is much to be learned By mixing it up ,and getting into a bit of Chaos outside the Box.

NMR,NAR ,LENR or something else ??

Rossi ,Alexander Parkhomov ,Constantine Balakirian, Steven Marks...Stanley Meyer  ...

its all the rage these days !

and it is our destiny.

[tinman]

Went to beginning of the thread and getting stuff together.

Mags

Set up a bifilar coil with a steel laminated core,where the core is two separate halves -1 half will see the flow of charge into the magnetic center,and the other half will see the flow of charge out from the magnetic center. Set up a simple self oscillating circuit,and run the LED off the two core halves,where you two core halves act like capacitor plates,and are charged every pulse. this way you can bring your frequency up to a resonant state,where the amplitude is at maximum,and power draw at a minimum.

Brad

[sm0ky2]

Theres a concept called negative capacitance. this is where the negative portion of the magnetic waveform is considered in the impedance equation. Basically considered as Reactance, in the electronics portion of the circuit.
Impedance = resistance + reactance(sqrt[-1])

Now,. we can't actually built a negative capacitor, (or can we?)
but mathematically, we can just throw the (-) out since we square it later in subsequent equations.
and replace the whole resonant mess with a capacitor of positive value.

This is the standard electronics model. Text books do not generally take this any further.
When we examine Inductance as being a proportional factor of Impedance and angular frequency
we essentially look at only the positive value of reactance.

we literally take the absolute value of this number, and apply it to already known electronics equations.

But negative capacitance can be calculated AND measured!!!  We know it exists,. but we assume it does not matter.
Or are (told) it does not matter....   Then we are shown other examples of when it actually matters.

Pay no attention to the man behind the curtain

L = X / w ; where L is inductance, X is reactance, and w is 2(pi)f

or we can take the "effective Q" = |X|/R ; <<<---- see, we can use this instead. and we don't have any pesky 0's in the division......

We are trained this way from day 1.
This is what is, this is what is not, this is how we use it.
these are the things that are not what we told you at first,
and this is how to get rid of these "problems".

[MileHigh]

Here is a clip that shows the Joule Thief schematic and gives a very good verbal description of how a Joule Thief works from start to finish.  It describes the Joule Thief as a switching device with positive feedback, which is exactly what I have been saying.  The word "resonance" is never stated.  The description is not too technical but it is verbose and complete and anyone that has a basic knowledge of electronics should be able to follow it and understand it.

https://www.youtube.com/watch?v=0GVLnyTdqkg

Now, that's in contrast to the previous two postings in this thread.  Sorry, but they are a bunch of mumbo-jumbo talk and both don't make any sense.  I know that it's not politically correct abound here to say this but it is what it is.

If you want to try to convince myself and others that you are making a valid case and supposedly making sense, then use the clip above as a standard that you can try to meet.  Fake pseudo electronics talk with nonsensical terms and the old "they don't want you to know" boogeyman talk just won't cut it.