I What can be used as a Frequency generator to make Chladni patterns?

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Chladni patterns can be created on a resonant plate by exciting it with a small hammer, a violin bow, or an electronic oscillator adapted with a speaker coil. Finding the critical resonant frequency can be challenging with electronic oscillators. An alternative method involves using a small electric motor with an unbalanced shaft to shake the plate at its rotation speed. A vibration generator paired with a signal generator and audio power amplifier is commonly used in educational settings. Overall, while various methods exist, achieving precise frequency control remains a key consideration.
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What can be used as a Frequency generator to make chladni patterns?
 
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Welcome to PF.

Chladni figures form on the surface of a resonant plate.
Striking the plate with a small hammer, or using a violin bow, will excite the plate.

If you use an electronic oscillator, you will need to adapt a speaker coil, or some similar transducer, to shake the plate. You may then have trouble finding the critical resonant frequency.

You could mount a small electric motor below the plate, with an unbalanced shaft, that would shake the plate at the motor rotation speed.
 
For school we use a vibration generator, which is like a speaker, and a signal generator with an audio power amplifier.
 
tech99 said:
For school we use a vibration generator, which is like a speaker, and a signal generator with an audio power amplifier.
I expect that transducer is the same as the ones I used to have in my lab. They are pretty heavy duty and link to a suitable waveform generator over several octaves (from very slow upwards). Natural resonances are more easy to induce, as you say but the re-arrangement of the sand when passing from one mode to another is impressive.
Baluncore said:
You could mount a small electric motor below the plate, with an unbalanced shaft, that would shake the plate at the motor rotation speed.
That's one approach (as with a water wave generator) but the frequency control of that method (motor speed) tends to be associated with big amplitude fluctuations.
 
So I know that electrons are fundamental, there's no 'material' that makes them up, it's like talking about a colour itself rather than a car or a flower. Now protons and neutrons and quarks and whatever other stuff is there fundamentally, I want someone to kind of teach me these, I have a lot of questions that books might not give the answer in the way I understand. Thanks
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