Effects of Recirculating BEMF to Coil

[rave154]

can t wait to see them goto :-)

[gotoluc]

Hi everyone,

a testing base line needs to be established to better study this circuit effect. That is why I first needed to confirm with .99 what I understood of using a fine filament bulb in series at the input as visual indicator of energy entering the circuit.

I have found that using meters no mater how expensive they are have been giving me false results. Once you makes a change to the circuit, like frequency and or voltage you want to re-tune the duty cycle to send back exactly the same amount of energy to compare the previous test. I know many will say your eye cannot be that accurate. That is right! ... if the intensity of the bulb is high... but if you keep the bulb intensity to the point where it just starts glowing and not go above that you will see that it has an amazing accuracy to show any change in the circuit. Just stay with this technique I just explained and it should work well enough. Also, know that you are not measuring anything with the bulb, it is just a visual indicator of change or a way to re-tune duty cycle after you make a change in order to send back exactly the same amount of energy in the circuit to be able to observe if the change you made is giving you more or less work for the same amount of energy. That is all you want to do at this time. Forget Over Unity proof.

You will understand more after seeing the video's below how I have been using this technique.

Link to test 5: http://www.youtube.com/watch?v=JwE5WlHL48k

Link to test 6: http://www.youtube.com/watch?v=_OsN_K3wNLA

Thanks

Luc

[TinselKoala]

Here's a question: Does the inductance of the magnet-lifting coil change, as the magnet lifts? I really don't know, and I think it would be interesting to try to find out. I can sort of argue both ways, at the present state of my knowledge.
I do know that bringing a powerful magnet close to the toroid of an operating Joule Thief causes interesting effects...it can quench or substantially brighten the LED...

It would seem on casual inspection that straight DC would lift the magnet higher than the reversing field from AC, at the same power levels. I think.

Got to build me one. Where did I put that mile of magnet wire....

[Peterae]

Hi
Sorry for jumping in on this thread, i havnt really followed the story so far, but wanted to clear up a question i have.
Is the bulb in series with the supply voltage cap and the circuit under test.?

Peter

[Peterae]

Ok just read some more of the thread and it does look like the bulb is in series with the supply cap and the device under test.
If this is so then the bulb is only telling half the story for the consumpion of power drained from the supply cap, you must also account for the voltage supplied by the power supply itself.

The bulb is lighting because of a voltage drop across itself, which is related to the current drawn through it and it's own resistance, but you then would need to multiply this current by the power supply voltage to get a true value of power consumed.
So keeping the bulb at a certain brightness but altering the supply voltage is indeed increasing the power consumed by the device under test.

Hope that helps

Peter