Is joule thief circuit gets overunity?

[TinselKoala]

    Bill and All:
    I've been asking for this one simple proof of concept, using an AA, or cap, to test the discharge rate, so that it can also be further verified by us here as well as on other forums.  Even by those of us that don't have any test instruments. Just a cap or battery on the circuit.  I've never ever heard of any reply back, only scope shots, after scope shots, after even more scope shots. With no self runner (still presently running), to show for it all though, as yet. Hopefully this will all be verified, some time soon. 

Are you looking for something like this? 
http://www.youtube.com/watch?v=e5G0PyJsoyo
It's relatively easy to know just how much energy you are _actually_ supplying to the circuit by looking at the time it takes for a capacitor to discharge by a known amount.

[TinselKoala]

Here are the last two scopeshots representing "output" that Lawrence posted up above, in posts 292 and 314. Notice anything interesting?

[ltseung888]

This is the first attempt to use the boards in a two stage fashion.  The Output of Board 71 is used as Input to Board 72.  However, not all the Output was used as Input.  The Output was parallel to the LED (connecting B1 and B3). 

The encouraging sign is that COP was -1.70 but the actual Input and Output Power values were very low.  This means the board will have to be redesigned to test the loopback feature.  More work and more challenge.  Any suggestions???

The Input waveform in this case is pulsed as expected.

[MileHigh]

TK:

Here are the last two scopeshots representing "output" that Lawrence posted up above, in posts 292 and 314. Notice anything interesting?

I am stumped.  I see that in the lower capture the scope probe on the voltage waveform must have been on 10X attenuation but that's not interesting.  There is a lot of noise on the current waveform but chances are that's normal at that gain setting.

Those waveforms relate back to my posting #271:

The torque that you put on the flywheel from pedaling is the battery voltage.  The torque that the flywheel puts on the belt during the braking is the coil voltage [or the LED voltage] when it's de-energizing.  The rotational speed of the flywheel is the current through the coil.

So the output waveforms represent the "belt applying braking to the rotating flywheel."

Beyond that, I am not sure what you are suggesting.  Duh.

MileHigh

[ltseung888]

Are you looking for something like this? 
http://www.youtube.com/watch?v=e5G0PyJsoyo
It's relatively easy to know just how much energy you are _actually_ supplying to the circuit by looking at the time it takes for a capacitor to discharge by a known amount.

It is great to see the many experts are focusing on this thread.  The oscilloscope test-ready boards should be in the hands of many such experts within the next few days.  The point I would like the experts to focus on is the negative power on the Input.

What does that really mean???  I can wait until the experts see the same thing on their own oscilloscopes.