Is joule thief circuit gets overunity?

ltseung888 · May 22, 2013, 07:41:00 PM

Just to show that two JT boards may be built based on the same circuit diagram but show very different results, I tried to similate the reading on the Void Board on reply 902.
*** One of our Current Curves should be inverted. But for comparison purposes, I leave them alone.

The comparison should convince anybody that the two Boards (Void and Board 124) are different. Different COP results are to be expected. The Spikes are missing on the Void Board.

We shall learn much more when Void gets the boards within 14 working days via Post Office Mail.....

Void · May 22, 2013, 09:58:26 PM

Quote from: ltseung888 on May 22, 2013, 07:41:00 PM
Just to show that two JT boards may be built based on the same circuit diagram but show very different results, I tried to similate the reading on the Void Board on reply 902.
*** One of our Current Curves should be inverted. But for comparison purposes, I leave them alone.
The comparison should convince anybody that the two Boards (Void and Board 124) are different. Different COP results are to be expected. The Spikes are missing on the Void Board.
We shall learn much more when Void gets the boards within 14 working days via Post Office Mail.....

Hi Lawrence. Those spikes on the waveforms on your board do appear to be noise spikes. Noise spikes that appear at a very regular interval like that could be caused by a switching power supply, as that is a typical looking sort of noise spike pattern that can be seen on an oscilloscope due to noise generated by a switching power supply. Another difference I notice in the waveform for your board is that your board is operating at a much lower frequency than mine. This will be very much dependent on the type of ferrite core used and the number of windings, as the frequency of oscillation of the circuit is determined in part by the amount of inductance of the toroid windings. Since you are using a different type of ferrite core than me, and you may also have a different winding count as well, the inductance of your windings will be different than on my board, and it would be expected that your board would operate at a different frequency than my board. As you say however, once I run some tests on your boards we can compare my measurements to your measurements to see how things look then. I would be really surprised if there is over unity, but we will see what the measurements show anyway.

I have noticed something interesting in some new testing I was doing, not relating to over unity, but maybe a way to improve on efficiency somewhat. I will run some more tests on my proto-board circuit when I get a chance, and post results if I find anything interesting.

ltseung888 · May 23, 2013, 05:23:58 AM

Quote from: Void on May 22, 2013, 09:58:26 PM
Hi Lawrence. Those spikes on the waveforms on your board do appear to be noise spikes. Noise spikes that appear at a very regular interval like that could be caused by a switching power supply, as that is a typical looking sort of noise spike pattern that can be seen on an oscilloscope due to noise generated by a switching power supply. Another difference I notice in the waveform for your board is that your board is operating at a much lower frequency than mine. This will be very much dependent on the type of ferrite core used and the number of windings, as the frequency of oscillation of the circuit is determined in part by the amount of inductance of the toroid windings. Since you are using a different type of ferrite core than me, and you may also have a different winding count as well, the inductance of your windings will be different than on my board, and it would be expected that your board would operate at a different frequency than my board. As you say however, once I run some tests on your boards we can compare my measurements to your measurements to see how things look then. I would be really surprised if there is over unity, but we will see what the measurements show anyway.

I have noticed something interesting in some new testing I was doing, not relating to over unity, but maybe a way to improve on efficiency somewhat. I will run some more tests on my proto-board circuit when I get a chance, and post results if I find anything interesting.

@Void,

The Box was mailed vis ordinary air mail at the Post Office this morning. It should arrive within 14 working days. Please post a message as soon as you receive it. I have the results from Boards 121 and 122 from Mr. Lau. I need to type and analyze them. Both appeared to indicate some unexpected behavior at around 0.4V..... That may be the sweet spot for the Zhou Boards.

Void · May 23, 2013, 09:21:32 AM

Quote from: ltseung888 on May 23, 2013, 05:23:58 AM
@Void,
The Box was mailed vis ordinary air mail at the Post Office this morning. It should arrive within 14 working days. Please post a message as soon as you receive it. I have the results from Boards 121 and 122 from Mr. Lau. I need to type and analyze them. Both appeared to indicate some unexpected behavior at around 0.4V..... That may be the sweet spot for the Zhou Boards.

OK, thanks.

ltseung888 · May 23, 2013, 10:41:44 AM

Result of Battery Change vs Time with Board 121 and 122. The experiment was performed by Mr. T S Lau.

Board 121 is simple JT. Board 122 is JT with Capacitor. General shape is the same.

At just below 0.4V, the slope of change is slow. LED gets dimmer but still ON for a few days. This portion is likely to be the "lead-out Energy" range.