Question on how to energize a air transducer

It isn't clear what all of your constraints are or what your complete objectives are so it is tough to provide ideal advice. 200KHz piezo transducers can be driven by any microcontroller connected to a power transistor. This also allows the 200KHz signal to be modulated with on-off-keying. If all 72 are driven with the same signal, it is much simpler than if you need to modulate each one differently.

echoing Doug and anniel747,

First one I found:

https://www.ebay.co.uk/itm/290986012821

Needs serious drive to get full output (140V pk-pk).

They give no idea of impedance but it's common (but no essential) to drive these things with a transformer and to tune the inductance with the transducer capacitance.

If you will drive 72 of them it's going to be expensive if they all get different signals (and hard to see any point in 72 driven all the same.)

But as is sadly so often the case you haven't told us anything like enough to get good advice.

Explain your project in detail, with diagrams etc.

The more you tell us the better we can help - you can't lose by it.

This is an open forum - everybody learns or nobody learns.

MK

Not always easy to give all the details on the design with out giving out to much information. What I am trying to do is create anti gravity to prove it exists for new theories I have been trying to get the Physics world to take seriously on how the universe formed. I ask for verification of work done by Pakistan students to verify my theories  and have had no response. I am confident if I can create anti gravity that they would not be able to ignore me any longer.

   I only need to send 1 signal  to all of the transducers. I am good a making about anything, but I don't have a back ground in electronics need a design that will power the transducers and allow me to piggy back a sound wave.  Thanks for your help Ed

I have tried to send you the data sheet but not able to copy and past it in for SMART200H19XDA  AIR TRANSDUCER. 

I am confident that you will not be ignored if you can demonstrate anti-gravity.

I am equally confident that you will not do so.

Levitation using acoustics has been demonstrated but is no more anti-gravity than, for example, a drone with fans for lift.

https://en.wikipedia.org/wiki/Acoustic_levitation.

But I'm not interested in advising a secret project.

MK

I can't tell from here, but that screw looks wrong - should be Pozidrive. Will never work with that one.

Ed2024 said:

SMART200H19XDA  AIR TRANSDUCER

Are you sure about that part number ?

SMATR200H19XDA
https://www.steminc.com/PZT/fr/air-transducer-200-khz

Thanks Dave - I took a look at the data sheet and as I suspected anti-gravity is not listed as one of the suitable applications for this part.

I think the pyramid thing might work if one of the fans was reversed.

MK

It's (probably) a piezoelectric disc, almost certainly operating in thickness resonance with some kind of coupling layer of different density to try an get a better mechanical impedance match with the air.

They work rather like the ultrasonic transducers on cars for reversing sensors but 200k ones a re harder to drive.

You usually need to drive it with a high voltage (single pulse or maybe short sine burst using a transformer) then you somehow isolate the drive and connect the receive amplifier. The 60dB or more difference between the TX and RX signal causes problems. There is always a minimum measurable distance because you need to allow things to calm down a bit in sensor and electronics before you can detect an echo signal.

MK