Bifilar induction with ferrite

[penno64]

Hi all,

This vid was in Minoly's favourites.

Have a peep if you have 5 minutes.

YouTube - ‪lyudkavsk's Channel‬‏

Penno

[frenky]

He is measuring AC current with DC meter?

In think he should use shunt resistor between signal generator and bifilar coil and watch how the waveform changes when he inserts the other coil...

[scratchrobot]

Hi all,

This vid was in Minoly's favourites.

Have a peep if you have 5 minutes.

YouTube - ‪lyudkavsk's Channel‬‏

Penno

Interesting thanks for the link, I was thinking of doing similar experiment.

[woopy]

Hi Penno

thank's for the link

just tested it and it work very nice ( as i already have a bifilar coil, it took me about 10 minutes to install the setup)

My bifilar coil is resonating at 150 kherz

zero amp (or unmeasurable amp) at the entry DC pulse current (square wave) from the sig gen.

With a very crude winding arround a ferrite rod i get a the LED lit with about 6 volts at peak and depending of the location of the ferrite in the bifi, about 1 ma current.

Very interesting How can we explain this ?

good luck at all

Laurent

[Slider2732]

That was a quick replication...nice work and clear too

What strikes me, is that the energy lighting the LED could be passed back into the coil ?
A multi-filar coil might display some rather interesting effects, like lasersabers ringing circuit perhaps. Or, at least the energy could go into a cap and other such tricks. If some of the thoughts within the Muller thread, the Tesla tower solid state circuits and induction threads combine, then the output of all of it could again light an LED and go around and around.
Maybe that's a fanciful thought, but this looks like a very effective little project.
The signal generator, or a 555 circuit would supply the initial push,...and off it may go, resonating, feeding back, ramping and amping at the resonant frequency.

[Zooty]

woopy .. was your signal generator output DC?

[wings]

Hi Penno
My bifilar coil is resonating at 150 kherz

zero amp (or unmeasurable amp) at the entry DC pulse current (square wave) from the sig gen.

With a very crude winding arround a ferrite rod i get a the LED lit with about 6 volts at peak and depending of the location of the ferrite in the bifi, about 1 ma current.
Laurent

at 150khz analog panel meter give wrong measurements, bandwidth is in the low khz range

[woopy]

Hi zooty

yes i use the squared wave only on the upper stage (+ ) that is DC PULSED

Hi wings

as i sayd this very simple experiment took me only 10 minutes of my time

and now some more 10 minutes to wind a second smaller core and more winding and get some other results.

For the first experiment i got the best results with 150 KHz for the second experiment i have to change the frequency up to 170 Khz to get more voltage and something less amp on the LED

yeepee this is the first experiment that gives real results with so little work

But i am perhaps and an other time be fooled and too optimistic, but i have no time to be pessimistic so i go on my way good or not

So wings. please get a try on this and than discussion

good luck at all

laurent

[Dave45]

sweeeet, this falls in line with some idea's iv been throwing around, too cool

[Dave45]

@Woopy
Hi since you already replicated this, may I ask a question is there a temperature change in the core.

Thanks
David

[Zooty]

I'd also like to ask what the output voltage is from the signal generator.

[Armagdn03]

I hate to rain on parades but I definitely do not think this is what people are generally looking for on this forum.

1) What kind of amp meter is that? AC? DC? High Frequency? most analogues have a wound coil inside creating the deflection of the needle, which means it will be very unreliable at some frequencies as it is itself reactive.

2) There is no way from the scope shot that that coil is in "resonance". This condition occurs when there is an equal interchange between inductive and capacitive reactances, This will look like a sine wave, this is nowhere near a sine wave.

3) When the ferrite core is inserted it will change the inductive reactance, causing a shift in the resonant frequency of the coil. Even IF it was in resonance before, it wont be now! The fact that this should radically shift the resonant frequency, (which the scope shot really does show) yet the freq gen is at the SAME frequency AND the amp draw supposedly stays the same????? Again makes me suspect of the meter.

4) The fact that there is a capacitive element between the coils windings, means there is a path for the energy. This is most likely reacting to the sharp transients of the square wave. I have passed energy through model transmission lines that have no conductive route plenty of times, a "tesla secondary" is a great example of this. One can capacitively excite it, and find that it still has a strong amperage and corresponding magnetic field at the grounded end when in resonance (actual resonance)! Capacitive coupling giving rise to a magnetic field is not really new.

[Dave45]

@Zooty
I believe the scope showed 10v,
@Armagdn03 unless there is a temp change
If we can pull the heat out of a system in the form of current then things are subject to change.

[Armagdn03]

@Zooty
I believe the scope showed 10v,
@Armagdn03 unless there is a temp change
If we can pull the heat out of a system in the form of current then things are subject to change.

Bringing heat into this will only confuse. There are some very obvious details to observe what is going on.

[Zooty]

Ok guy's i tried this with a 555 setup to near 50%. Just like the original experiment showed, there is no apparent current flowing through the output BUT the input current on the 555 did triple when i inserted the ferrite.