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View Full Version : Electronics Anyone ever built a Chlandi Plate?


mlyonsd
02-16-2012, 06:27 PM
Working with my son on his science fair project. He found a chlandi plate example and it seems like a faily interesting thing to build. Basically the plate will allow you to 'see' sound waves. My son's theory is that different density metals will alter the patterns.

There are four basic parts....source signal, amplifier, wave driver, plate that sits on the driver. Well, ok, 5 parts, sand, salt, or some other fine material.

I have an old amp and we've built the wave driver from an old speaker using this as an example.

http://www.instructables.com/id/Mechanical-Wave-Driver-for-Chladni-Plate/?ALLSTEPS

My question is on how to generate a signal to the amp. The signal generator needs to be able to send an adjustable signal to the amp up to at least 2000 hz. More would be desirable. I think our two options are to buy a signal generator or use downloaded software like tonegenerator.

Thoughts?

This is what we're trying to do:

http://youtu.be/Qf0t4qIVWF4

Brock
02-16-2012, 06:29 PM
I don't think signal generators are cheap.

FAX
02-16-2012, 06:30 PM
You just need a tone generator, right?

FAX

chiefs2012
02-16-2012, 06:30 PM
gotta love the parents home work assignments.

mlyonsd
02-16-2012, 06:34 PM
You just need a tone generator, right?

FAXRight. One that can be manually adjusted.

mlyonsd
02-16-2012, 06:35 PM
I don't think signal generators are cheap.Yeah that's what I'm finding out. Well at least for a good one.

FAX
02-16-2012, 06:35 PM
Right. One that can be manually adjusted.

Those on-line deals look pretty good. I've never used one, but some are free. I might start there. Do you have a keyboard? Like a casio or something? Wouldn't that work?

FAX

cdcox
02-16-2012, 06:38 PM
Nope, but built one of these:

http://www.youtube.com/watch?v=JfmZsIwCwQw&feature=related

Extra Point
02-16-2012, 06:50 PM
Gotta few bucks?
<iframe width="420" height="315" src="http://www.youtube.com/embed/jLJHTaVDcMY" frameborder="0" allowfullscreen></iframe>

mlyonsd
02-16-2012, 06:53 PM
Those on-line deals look pretty good. I've never used one, but some are free. I might start there. Do you have a keyboard? Like a casio or something? Wouldn't that work?

FAX

With a keyboard I'm not sure how you would document the hertz output.

mlyonsd
02-16-2012, 06:59 PM
Nope, but built one of these:

http://www.youtube.com/watch?v=JfmZsIwCwQw&feature=relatedHa, I loved how the boy almost touched the dry ice about 3 times with his bare hand when he pulled it out of the cooler.

Baconeater
02-16-2012, 06:59 PM
No, I haven't built a Chlandi Plate. I would have to know what the hell a Chlandi Plate is in order to do that.

mlyonsd
02-16-2012, 07:00 PM
Gotta few bucks?
<IFRAME height=315 src="http://www.youtube.com/embed/jLJHTaVDcMY" frameBorder=0 width=420 allowfullscreen></IFRAME>That fucking Spielberg won't return my calls.

mlyonsd
02-16-2012, 07:08 PM
gotta love the parents home work assignments.I'm just the $$$. He's built everything himself so far.

Here's an idea if your kid is ever looking for a science project....It only requires 3 things.

Take a garbage bag and zip tie it around your head. Then have your kid use a stop watch to see how long you have a pulse. Fuckhead.

FAX
02-16-2012, 07:10 PM
With a keyboard I'm not sure how you would document the hertz output.

Every note has a frequency. You can find a table of frequencies for each note online.

FAX

trndobrd
02-16-2012, 08:45 PM
Last time I saw soundwaves was OmegaFest '90.

mlyonsd
02-16-2012, 08:54 PM
Every note has a frequency. You can find a table of frequencies for each note online.

FAXYou sir are a genius and the reason the planet is a great information source. Tested it out with an old Yamaha keyboard that finally came in handy.