Is joule thief circuit gets overunity?

[ltseung888]

This is the interesting case.


The AA battery was disconnected.  The 2.3V 10F capacitor was left connected.  The Output Voltage Frequency increased from 1.4 KHz to 5 KHz.


The readings (Input5 and Output5) were then taken.


Bingo!  The COP was -6.4!!!


Let the replication, the interpretation and the application begin.  Thank you to the Almighty.

[TinselKoala]

@Plengo: thank you for your nice comment. Sometimes I feel like I'm shooting in the dark. We shall see what becomes of my efforts and if I can really help or am just wasting everyone's time.

@LTseung: Thanks for providing the spreadsheet files. I'll be taking a look at them over the next day or two. Meanwhile, could you please post the _exact_ schematic used for the tests, and please be sure to indicate exactly where the scope probes, power supplies and external meters are attached. I need this information to be able to evaluate the data, and to reproduce the experimental trials if necessary.



Meanwhile, for your amusement, here's a motor that _does_ run on lots and lots of voltage and not much current at all.
http://www.youtube.com/watch?v=vqf3bUL4YqE

[plengo]

I have a question for those that know anything about Mr. Newman. What is the inductance of the coil he is using in his coil on that 2000 pound motor? Speculation of our part, yes, but I can speculate based on the previous motors he has shown all his life and are very well documented in how to build one.


I would think the induction would be enormous.   I don't think 270 volts will pass even 5 mili-amps of current. Now, how that motor with that little current can even run?


I really want to see how smart the engineers here are, specially Mr. Mile HIgh.

Fausto.

[MileHigh]

Fausto:

We can all express our opinions.  This is of fundamental importance and this is something that we all have to deal with in our own way.  When I tell you that the setup that Joe Newman demonstrated is of no significance I am expressing my true opinion in all sincerity.  You have to "go with the flow" and sometimes that means agreeing to disagree.

A Newman motor is a big coil with a rotating magnet inside the coil.  I think that sometimes he plays with the contacts on the commutator to "chop" the energizing of the coil as the rotor turns.  I don't see anything special.

Then, take a look at Joe Newman himself.  He has been at this for 30 years and after all that time he still doesn't present any measurements when he does a demo.  Why can't he put a current sensing resistor in series with the coil to show the current and also show the voltage across the coil with two channels of a scope.

You ask me to read a 1911 book and I might not listen to you and I might ask you to look at the current waveform for a coil to look at the R/L time constant and you might not listen to me.  We can both get frustrated but we can just move on.  Try not to get too emotional about this stuff!

Live and let live!

MileHigh

[TinselKoala]

Then I won't jump in until MH has had a chance to answer.


Meanwhile, here's a quick video showing how Lawrence -- or anyone else who cares to -- can determine the actual resonant frequencies of his JT coils, out of circuit. In the circuit the resonant frequency will change depending on the load the coil sees. This method can also be used in-circuit by disconnecting the circuit's input to the coil and using the FG instead, and monitoring the output voltage with the output side of the circuit connected, I think. Or if the circuit's own oscillator can be swept in frequency, that is the very best way to do it: sweep frequencies until the output voltage peaks.


http://www.youtube.com/watch?v=y9ZN5QJZClY