Pulsed DC Transformer with Embedded Magnets

[XS-NRG]

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[Mk1]

THANK YOU.  This will greatly help Aaron and HKU.  One of the fears is that someone will claim that all their hard work was already done by the Joule Thief experts.  Aaron has mastered the technique of using variable resistors, variable capacitors and variable inductors.  In particular, he had produced some home-made inductors from low cost components.

Their LCR tuning work will not be in vain.

I do appreciate and recognize that you are the first one to light the LED from the secondary.  Dr. Raymond Ting and the students from our side also found that they could generate a higher peak-to-peak voltage from the secondary.  There are tricks to improve performance with different winding techniques.  Small changes can lead to greatly increased COP.  The more loosely coupled secondary allowed more room for LCR tuning.

Respectfully , yes a i was the first to light leds from the secondary and also the first to light incandescent bulb from the secondary also .
http://www.youtube.com/user/abramrk1#p/u/9/wS935WyumjY
And DC motor , you know inductive loads ...
http://www.youtube.com/user/abramrk1#p/u/6/eiLcbTBewhw

Well , all i can say is that you showed us your true side in the last post ...

Its all in the tuning , like you said .

If did put a load on the secondary you would have known that the Joule thief circuit reacts to the load in many different ways , like changing the freq , so by default your reasoning flawed .

By your own will , fool your self ...

Show me what you can do , before concluding that you out done us .

Plus any patent on the idea would clearly show intellectual fraud .

My guess is you tried little bulbs but couldn't do it . So you joule thief is not that good .

I always give the benefit of the doubt at first , closer inspection show something else ...

Btw a scope is not a load , what value resistor do you use ?

Mark

[ltseung888]

Its all in the tuning , like you said .

...

Btw a scope is not a load , what value resistor do you use ?

Mark

We used various loads on the secondary.  The simplest one is a LED so that we can see light and a 1K or a 100 ohm variable resistor.  The more complicated ones had additionally a capacitor and the 108 LEDs - we kept swapping capacitors until we observed good results on the two oscilloscopes.

The best prototype in my possession showed Output Power = 12 watts peak-to-peak.  The very best one at Dr. Raymond Ting had Output Power = 48 watts peak-to-peak.

We also played with feedback.  Some voltage was fed back via the variable resistor.  The very best result was the continued lighting of the 108 LEDs while the Input Power was too low to measure on the oscilloscope.  On turning off the Power Supply with 1 LED, the LED continued to light dimly for approximately 30 seconds.

The above were the best results I personally observed, measured or photographed in Hong Kong before Oct 26, 2010.  I have not done any such tests in US yet.

One good result is shown below.

[Mk1]

Nice scope shot , tell me what are you using for load on that experiment .

In other words what is connected to the secondary ?

Some diodes ? Led maybe ? just the scope ?

when you say you 104 led is that in the transistor , or the secondary .

The scope shot , is not helpful without any details.

Also , like people transistor are also different from one another , always test multiple transistor even of the same model and make.

Mark

[minde4000]

It would be nice to see both of those scopes in progress on unedited video with all probes and cables clearly visible.

Minde