Is joule thief circuit gets overunity?

[ltseung888]

@Lawrence: I have received your JT boards in the mail, and as soon as I get a chance I will run some power measurements on your boards and post the results here in this thread, if you like. Other than basic power efficiency tests at say an input power supply voltage of 0.5V, are there any other specific tests you would like me to run on the JT boards you sent me? I can also run comparison power measurement tests with a super capacitor as the input power source, and with a battery as the input power source, to compare results.

Edit:
A quick preliminary test on board #'s 118 and 119 (with the DC offset on my scope channels first checked for calibration) shows no zero crossing on the input current waveform, as would be expected. The waveform shapes appear to be pretty close to what I see on my JT circuit, with one difference being that Lawrence's boards run at a lower frequency than my JT board. I will run full power measurement tests on these boards as soon as I get a chance.

@Void,

Great.  We can do similar experiments.  The first one I would like to check is the occurrance of the Spikes - possibly due to "electrosmog".

Try to capture the waveforms in your standard environment.  Then repeat with the Board close to a "noisy" environment - next to some electrical appliance such as PC, TV, washing machines etc.  Check whether you can detect any spikes.  We can use TK's video or the wireless JT circuits as a guide to produce "electrosmog" if needed.  Check whether such spikes cross 0 ref line.

[profitis]

where is that guy now, tinselkoala?yoohooo,yo bro

[Void]

@Lawrence: Here are my power measurements for your JT Board # 119.
For the same input voltage (0.5VDC) using my regulated power supply, your JT board runs at a much lower frequency than my board (most probably mainly due to the different type of toroid you are using), and your board also has higher input and output currents than my JT board at the same input voltage. The switching spikes on the input voltage waveform on your board are sharper with a higher amplitude, and with less ringing than I get with my JT circuit.
The efficiency measured to be pretty close to my JT board at the same input voltage however.
Do you want to see these same type of measurements for the other boards you sent me as well?

Input Voltage:  500mV
Input Power:  5.282mW
Output Power:  3.779mW
Efficiency:  71.54%

I am attaching the scope screen shots below.
Yellow traces are the voltage waveforms, and blue traces are the current waveforms.
I am also attaching the Excel spreadsheet files showing the data samples and the resulting power calculations.
-- void --

[TinselKoala]

where is that guy now, tinselkoala?yoohooo,yo bro

This is OT and I don't want to hijack the thread... but sorry, I got a null result on your experiment. I couldn't detect any current through the Fluke ammeter. The moving coil meter was too unstable and responded to electrostatic field from my hands.

[bryanwizard]

Yep. But if your input power is free, and would be wasted if you didn't harvest it somehow.... that's good, right? And even 80 percent is pretty good if your input power is free, because...well... your input power was free. If it really is, that is. Maybe a "forever light" needs a chemical bias source that remains at 0.45 volts in order to be able to continue to harvest electrosmog for long periods of time or something, and the chemical source's voltage need not be depleted, as long as the power through the system is coming from the electrosmog.
Like the spring on a screen door. You only have to do work against it once, to open the door and prop it open with a rock. Then the flies can come and go as they please through the open door.
Experiments can be done to rule out all of these hypotheses, and finally the real explanation for Lawrence's "forever light" will emerge.

would be possible to used the earth battery as an input power