Acoustic magnetic generator.

[synchro1]

Unfortunately the magnetization is wrong.
It would have to be magnetized circumferentially, but it is axially

Why not simply stick two speaker toroid magnets together in attraction with the piezo transducer in between, along with some inert spacers to regulate the correct pressure or airgap, and allow room for the windings. Cutting the ferrite is a bad idea.

There is a simplified formula for calculating piezo power consumption, but the best approach would be to just wire a resistor in series with the transducer and coil and measure accross it. The power consumption while in resonance drops considerably as demonstrated by Tinselkoala from 5 nto 2 volts at the 24khz resonant peak in his video.

[verpies]

Why not simply stick two speaker toroid magnets together in attraction with the piezo transducer in between, along with some inert spacers to regulate the correct pressure or airgap, and allow room for the windings. Cutting the ferrite is a bad idea.

Because it suffers from the same shortcomings as Itsu's original idea described here (and my reply below it).

Also do you remember that a ferrite magnet has a relative permeability close to 1 (like air) while a soft ferrite core has a relative permeability much more than that (usually ~1000) ?

[tim123]

Hi Guys,
I did a few tests today - to test the hypothesis of the opening post - that mechanically vibrating a magnetic core give a useable output in a coil. Using:

- A signal generator. 7v Pk-Pk. Sine wave.
- A 20mm(ish) piezo element
- An electromagnet - which makes an excellent pickup coil
- A 2" ferrite magnet
- A small stack of N42 neo disks

I did a number of tests with different arrangements - but mostly with the piezo in physical contact with either the magnet, coil, or both. (Actually I put it in a plastic bag to prevent direct electrical contact.)

Attached photo shows one arrangement with the ferrite magnet.

I found two main resonance points - no matter the arrangement, at about 100KHz, and 10MHz. The exact resonances did change, but not by a lot.
The voltage output from the coil was always less than the input - in the example above I got 1.76v(P-P) out at 10.3MHz

I suspected that the resonance points may be the natural resonances of the Piezo element itself, but I think its actually the coil...
I tried just the piezo and coil - without the magnets - and again got similar results.

In the end, suspecting capacitive coupling, I replaced the piezo with 2 sheets of aluminium plate as a flat-plate capacitor, and put the coil on top.
I got virtually identical results.

So - in conclusion:
- Capacitive coupling from the piezo may look like an acoustic excitation - but it isn't.
- Did the author of the patent make this mistake?
- 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

[verpies]

In the end, suspecting capacitive coupling, I replaced the piezo with 2 sheets of aluminum plate as a flat-plate capacitor, and put the coil on top.  I got virtually identical results.

Good experiment.  I cannot visualize the arrangement, though. 
Please make a drawing including the magnetization direction of the magnets.

- Capacitive coupling from the piezo may look like an acoustic excitation - but it isn't.

An important artifact to watch out for in experiments, then.

[magpwr]

hi everyone,

I have just uploaded my first working overunity project into youtube.This is based on Magnetic Resonance Amplifier using Barium Titanate which was purchased from ebay around 2 years ago.
The input current consumption is "0.5uA" via Barium Titanate output current  maximum achieved 500uA from output of another bifilar coil.That's estimated 1000x ou in uWatts.

Magnetic Resonance Amplifier using Barium titanate ver 1.0
http://www.youtube.com/watch?v=MbQJexS4M4k

I don't know why i need to whisper while creating secret video in my room,can't help it.

If anyone know of any signal generator circuit or I/C which uses less than 100uA current and able to produce around 18khz.Please do advise me so that i'm able to demonstrate a close loop system to blink led forever at least.

I have attached a photo to show which of the sample which gave me the best result.

Do google "Magnetic Resonance Amplifier" my experiment is actually based on old research done in the 90s by a group of scientist.