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Building a Crystal Oscillator

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i have no idea how you would excite a large quartz crystal, is this for display purposes?

the cheapest way would be to go with a 555 oscillator and a potentiometer to generate a square wave, then filter it for a sine wave.

generally you feed a low power signal at the desired frequency into a power amplifier, so the amplifier is a whole other can of worms.

what power output at what frequency do you actually want? 42Hz? 420Hz? 42KHz? at 42Hz or 420Hz you can use an audio amp, but at 42KHz you'll have to design or buy one.
 
Read up on Nikola Teslas work with resonant frequency. He did tons of experiments with it. One that was so successful it nearly shook a building apart and he was ordered by the city to stop work or find a new location for his lab. It was right around the time that he was working more with radio. Radio is a generated frequency on one end , the receiver picks it up and the tuner has a coil that resonates at the correct frequency of the signal that was transmitted. His patent drawings are online if you search and they show how he generated frequencies with very little electronics, because they didn't exist then.


His earthquake machine:
http://www.freeinfosociety.com/article.php?id=190



One way you can do it is two electromagnets placed closely together powered by a AC power source. The magnets will attract and repel at the rate of the AC power and will shake anything they are attached to at the same rate. If you want to see this at work go to a pet store and buy a real cheap aquarium air pump, they cost under $10. Inside there is an electromagnet and across from the magnets output is another magnet attached to a rubber diaphragm . When the power is on the electromagnet pushes and pulls the magnet, moving the diaphragm and generating air. The downside of these pumps is they can be very noisy and they vibrate a lot.

You can scale something like that up easily to any size you want. Then you just need a AC power source that you can change the frequency. Many ways to do that , from using old alternators, to old motors.
 
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I happened to catch this just after you posted yesterday & needed time to think about. Search for "transducers" as that is mostly what speakers in water are called.

The typical speaker is a transducer. It is just coupled to air versus water. A water speaker or transducer will couple the most energy into that medium ... medium also being the operative generic term.

The medium is also directly coupled to the container (if there is a container). This could simplify or complicate what is a transducer, per se. But I think it would be quite different if you were trying to do this out in the deep blue sea versus a beaker on the bench. NOTE: I said "I think"

This is interesting. I some really expensive software I use that may or may not be useful/helpful so please post back here what progress you make for the collective mind pool. LOL
 
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