Joule Thief 101

[tinman]

Everything should be considered with reasonableness and common sense and balance, don't you think?

When some of the magnetic alignments in a magnet spontaneously decay (increasing entropy) and the total magnetic energy stored in the magnet decreases then that lost energy is converted into heat.  Now of course that's Brad's cue to jump in and say, "See MileHigh is wrong again!"  But we are going to be reasonable and state that for all practical intents and purposes, a magnet does not "dissipate energy" as heat because in the real world it is not measurable.  It's just as crazy as claiming that your flashlight works by drawing energy from the Earth's magnetic field or that when you determine the top speed of a car you have to do it on a slope.  That kind of ridiculous nonsense is just what it is - ridiculous nonsense.

If we split hairs every single time we state something we end up going crazy.  I am not going to live in a nuthouse like that.

MileHigh

Blah blah blah
Trying for the big bailout already.
Changing the terms and conditions to suit your own need to be right.
But you have just found out that you are wrong again<--yes,again MH.


Brad

[tinman]

Sounds like youre implying that Magnets and Atoms are Perpetual Motion Machines!!!

I hope not! You know what this means!

   Chris Sykes
       hyiq.org

Exactly as i said,,no one bothers to take note of what the electron within the atoms of the magnetic material are doing. In fact,i dont think anyone here know's--or most should i say.

People are just happy with what there told,without trying to make sense of it them self.


Brad.

[EMJunkie]

OOOppp's

Brad, your scope shot shows the expected 90 degree phase difference as predicted by Faraday's Law: The induced (negative) EMF in the second coil is proportional to the _time rate of change_ of the inducing magnetic field from the first coil.

The first coil's magnetic field follows, to first order, the current shown on the scope trace. At the peaks of this current, the time rate of change is zero (instantaneous slope is horizontal) -- and so the induced EMF as shown in the second coil's trace is zero (the induced current trace crosses the zero volt baseline at the same time the inducing current peaks.) When the inducing current (magnetic field) is changing at its maximum rate (the place where the instantaneous slope is steepest or most vertical: the zero crossing) the induced current is at its maximum (the peaks).

As you raise the frequency of your test, stray inductances (wire connections) become increasingly important and the observed phase difference on the scope will change.

Now back pedling:

You are truly idiotic! Did you fail calculus in school, perhaps? Or maybe never even took it? You can see for yourself that Brad's scope traces _perfectly_ describe what is predicted by Faraday's Law of Induction !

Or maybe you can't. Do you not understand what "time rate of change" actually means? d/dt? Apparently you do not. At the peaks of the waveform the time rate of change goes to ZERO-- the instantaneous slope is horizontal. Faraday's Law tells us that the induced EMF at that point is ZERO. At the zero-crossing of the waveform, the time rate of change is MAXIMUM -- the instantaneous slope is as steep as it ever gets. Faraday's law tells us that the induced emf (with negative sign) is MAXIMUM at that point--- as is clearly shown on Brad's scopetraces !

Do you even know what the magnitude of the phase shift introduced by your cheap current clamp actually is? Have you ever done the simple test I asked you to do long ago, comparing the current clamp reading with a simultaneous reading from an in line CVR?

This is in-concieveable TK!!!

I caught you out on the biggest mistake you have ever made and you wont admit it and correct it? This shows clearly that you truly do NOT understand basic magnetics!!!

This is Gold!!!

Keep going this is classically Funny!!! Please everyone pay attention to these mistakes! Try to learn form the assumptions that these people make!!!

   Chris Sykes
       hyiq.org

[tinman]

As far as the friend-funded Rigol DS1054z oscilloscope goes, and as anyone following my work knows, the First unit I received _definitely_ had a hardware fault from the factory and was replaced within days of my notifying Rigol and TEquipment. The Second unit I received worked fine, and I identified several SOFTWARE BUGS that were acknowledged by Rigol during the six months or so that I used it daily in my work. That scope had an early version of the Boot Loader software on it that caused the bugs. RIGOL THEMSELVES asked me if I wanted to trade out that scope for one with the _current_ Boot Loader, and I agreed to do so. They sent me the replacement completely free of charge, and sent it to me _before_ I sent the obsolete unit back, so I could test them side-by-side for several days, which I did, and which tests I reported to Rigol and on another forum where I sometimes post. So I am now using DAILY in my work the "Third" actual scope from Rigol. I've found a few bugs in the software of this scope as well, and have reported them to the appropriate places. The "average" user would never encounter most of these bugs in their daily basic scope use. For sure, EMJunkie would never see them, or even be able to tell when they hit.

It is a baldfaced and transparent lie that I "busted and blamed on the OEM" anything to do with my DS1054z. I have identified software faults in this complex and low-cost instrument, that are indeed due to oversights and poor programming on the part of the OEM. They are definitely NOT due to my "busting" anything, and my bug identification and reports are helping Rigol to improve their quality and service. The Rigol DS1054z remains the best oscilloscope value for the money (although the new Siglent scopes come close), and the few remaining bugs are not likely to be encountered by any but the most advanced scope users and can easily be worked around if they do crop up. Hopefully they will be fixed in the next firmware update and will no longer cause anyone any difficulty.

As always, I am happy to help (almost) anyone with understanding their instrumentation, with recommendations, and interpretation of what they see. The lying fool EMJunkie, however, can go spit.

I will vouch for all stated above.


Brad.

[EMJunkie]

Exactly as i said,,no one bothers to take note of what the electron within the atoms of the magnetic material are doing. In fact,i dont think anyone here know's--or most should i say.

People are just happy with what there told,without trying to make sense of it them self.


Brad.

Hahaha Brad, I was being vicious, I was Cow Poking TK again!

   Chris Sykes
       hyiq.org