v.2 (vurtion two)
Help for 7th Grade Science Fair Project - How to Generate Sound Waves
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- KVRAF
- 4064 posts since 2 Jul, 2005
You can build a simple transducer that is only useful in the low frequencies from cheap materials. That and a few power transistors plus an op amp or two will work. If you already have the function generator it’s a matter of being able to move enough air for the trick to work. You can grab a pile of large speaker cones from a thrift store for super cheap. Then you’ll want to put them in a big cube with every side as solid as possible except for one. The last side should be made of something elastic like plastic or rubber.
You can find simple power amp schematics all over the place.
You can find simple power amp schematics all over the place.
Don't F**K with Mr. Zero.
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- KVRAF
- 4064 posts since 2 Jul, 2005
An amp like this with a large output capacity: https://www.electronics-tutorials.ws/am ... ifier.html
Then something like an astable multivibrator if you need an easily controllable waveform generator: https://electrosome.com/astable-multivi ... ansistors/
If you want to change the output waveform you can clip it with diodes.
Then something like an astable multivibrator if you need an easily controllable waveform generator: https://electrosome.com/astable-multivi ... ansistors/
If you want to change the output waveform you can clip it with diodes.
Don't F**K with Mr. Zero.
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- addled muppet weed
- 105849 posts since 26 Jan, 2003 from through the looking glass
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- KVRian
- 629 posts since 15 Jun, 2017
Using fire is pretty and spectacular. You can use the sort-of-same principle to make it represent a standing wave using a perforated tube.Michael L wrote: ↑Wed Nov 20, 2019 10:22 pmExcellent point. Sound also creates cymatic patterns in fire:
https://www.youtube.com/watch?v=2awbKQ2DLRE
https://www.youtube.com/watch?v=1O2uXlBzPtU
But using fire is somewhat complicated (and risky). Maybe just use sand-on-a-plate-on-a-speaker.
https://www.youtube.com/watch?v=tFAcYruShow
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- KVRAF
- 4814 posts since 25 Jan, 2014 from The End of The World as We Knowit
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- addled muppet weed
- 105849 posts since 26 Jan, 2003 from through the looking glass
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- addled muppet weed
- 105849 posts since 26 Jan, 2003 from through the looking glass
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- KVRAF
- 4814 posts since 25 Jan, 2014 from The End of The World as We Knowit
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- KVRAF
- 4814 posts since 25 Jan, 2014 from The End of The World as We Knowit
Nah, if we interacted with him, he wouldn't be copying someone else's product but would be doing something original like making a fireproof microphone drone to sample the sounds of catastrophic California forest fires!
s a v e
y o u r
f l o w
y o u r
f l o w
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- addled muppet weed
- 105849 posts since 26 Jan, 2003 from through the looking glass
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ScienceFairMom ScienceFairMom https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=451510
- KVRer
- Topic Starter
- 12 posts since 18 Nov, 2019
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ScienceFairMom ScienceFairMom https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=451510
- KVRer
- Topic Starter
- 12 posts since 18 Nov, 2019
He did succeed in blowing out a smaller fire by funneling the sound waves down as more directed wind but that works at any frequency and isn't proving the hypothesis that the wave frequency affects the ability to put out the fire.
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- addled muppet weed
- 105849 posts since 26 Jan, 2003 from through the looking glass
was that at an excessive volume?
could be that funneling the output is increasing the power?
could be that funneling the output is increasing the power?
