Acoustic magnetic generator.

[verpies]

@verpies, it would be better to take a bar magnet and first determine its natural resonant frequency by the method given below.

I'm all for determining the acoustic longitudinal standing wave fundamental frequency of the magnet (or magnet/core combo) as shown in this video or by acoustic Time-of-Flight methods.

The achievement of standing waves greatly localizes and magnifies the amplitude of acoustic vibrations in matter.

Second step should be to stick two piezo speakers on both end wired to increase the amplitude of the resonant logitudinal wave.

Two piezos are not necessary in systems like this.
Also, any single-ended piezo should have a massive counterpoise on its other side anyway.  It must have something to brace against...

[synchro1]

Dear All.

Verpies suggested to me via PM that you guys and gall's might be interested in some of my findings using ultrasonic stimulation of a ferrite split core.

This is just one of a series of tests carried out using a very cheap Piezo transducer.   https://www.youtube.com/watch?v=Ql2zfs5vevM

I have since purchased some 40 W industrial transducers to continue my experiments with. The results will follow sometime soon.

You will notice that stimulation can occur without even touching the ferrite core !! You will also note that the Piezo transducer is not connected in any way to the output coils !!

Cheers Grum.

@Verpies,


Quote from Grumage:

"You will notice that stimulation can occur without even touching the ferrite core !!".

Take special note that Grumage's output volatge is maximized by correct air gap distance positioning between the piezo transducer and the ferrite core!!


P.S. Apparently Jimboot's voltage gain with the second piezo in series was an error caused by a large magnet in close adjacency to the experiment.

[Google]

Hi!

I have posted some queries below grumage s video on YT. Can you please go thru and comment.

Best

[verpies]

Take special note that Grumage's output volatge is maximized by correct air gap distance positioning between the piezo transducer and the ferrite core!!

Not between the piezo and core but between the two C-core halves.  Grum can confirm or deny.
This is to be expected with acoustic standing waves forming inside the core.

[synchro1]

Hi!

I have posted some queries below grumage s video on YT. Can you please go thru and comment.

Best

Failed to find your comments on Grumage's YouTube video. Thanks for the longitudinal resonance video link.

Piezo transducer power consumption is a function of input voltage and frequency. The proportion is exponential not directly proportional. The higher the frequency, the lower the transducer impedence and the greater the power consumption. The highest gain is at the lowest acoustic frequency. The piezo ferrite resonance video shows the first peak at 8.78 KHz. Raising the frequency above this level lowers the COP. Ultra sound vibration is causing the transducer to waste power at a inordinate level.

My COP calculations are based on .5 volts at the lowest acoustic resonant freqency in milli watts compared to the watt rating of the LED.