Acoustic magnetic generator.

[magpwr]

The majority of the limitation is not low current but high frequency.  (even as low as 1kHz).  See this and this video.

Your experiment is not measured properly. You cannot multiply AC Volts by AC Amps and expect to obtain average Watts - that calculation works reliably only for DC.

I would appreciate if you measured input voltage and current across a 1Ω current sensing resistor (non-inductive!!!) simultaneously with two channels of your scope.

The output voltage and current can be measured a similar manner ...or with a brightness of an incandescent light bulb with a straight filament (e.g. from auto dome light) and sensed by a PV cell in a dark box (calibrated with DC).
You cannot do that with non-DC !!!
Finally, you cannot draw any COP conclusions from the fact that the power output does not affect the power input - even if these power levels are measured correctly.  Relative power levels don't mean much - only absolute levels do.

Dear verpies,

You are absolutely correct.The multimeter gave false 0.5uA reading for the current regardless of frequency to sample-Barium.

Since this is low current i used 1KOhm 1% resistor to accurately measure current.

I have attached 3 photo to show default setup without sample,voltage measured across 1k shunt to bifilar coil,voltage measured across 1k shunt at resonance.
Used math function A-B .

The current measurement without sample was accurate at 1.8mA as compared with multimeter reading.

But once sample is in place and at resonance the oscilloscope reveal there is actually around 3.5mA current drawn.

I'm sorry for wasting everyone time hence i have promptly removed the video swiftly without second thought.

Thanks verpies.

[tim123]

I'm sorry for wasting everyone time hence i have promptly removed the video swiftly without second thought.

You've not wasted anyone's time mate. It's all good fun, and part of the learning process...

The only 'failed experiment' is one in which nothing was learned...

Regards, Tim

[tim123]

I'd just like to point out that - as Verpies said - we're talking about 2 different devices on this thread. It's a bit confusing.
Magpwr & I were testing different things.

I'd still like to work on the NAR aspect of this...
1) Cancel out the electrostatic field of the piezos if possible - maybe 2 opposing ones
2) Put piezos in 2 or 3 dimensions on the target coil
3) Try harmonic resonances & beat frequency interactions...

[Grumage]

Hi Guys,
- If there are acoustic resonances to be found - the piezo's capacitance / electrostatic field would likely prevent it from being observed.
- A non-electrical means of acoustic excitation would be preferable.

Regards, Tim

Dear Tim.

I have had rather a busy weekend and only just got back to catching up with the posts on this thread.

If you go back to my video below, from 8.15 you will note that we can stimulate an electrical output by mechanical means. I can assure you all there was no apparatus running other than the scope at that point !!

https://www.youtube.com/watch?v=Ql2zfs5vevM

Since then I have also re done the experiment with the cores placed in an earthed faraday cage and can report that although the collected output seen on the scope was much smaller than before. The very same results were recorded.

Cheers Grum.

[tim123]

If you go back to my video below, from 8.15 you will note that we can stimulate an electrical output by mechanical means. I can assure you all there was no apparatus running other than the scope at that point !!

Hi Grum
  I'd forgotten that bit of your vid. Thanks - it is very interesting. I'll have to try it.

When you rub the cores by hand - can you focus in with the scope and see what the resonant frequency is? Is it the same as with the piezo?

Since then I have also re done the experiment with the cores placed in an earthed faraday cage and can report that although the collected output seen on the scope was much smaller than before. The very same results were recorded.

If you replace the piezo with 2 disks of foil or metal of the same size - what happens then? (I do seem to be at the 'capacitive coupling' stage of my education... So forgive me if everything looks like that right now)

Perhaps a good test would be to use a decent sized ceramic insulator between piezo and coil - it'll transmit the sound but not the electric field... I tried two opposing piezos today - but the output was the same as with one. It was a crap experiment though...


Regards, Tim