Yes to catch the resonance. Also playing a test tone from a speaker we might be able to get a rough idea of the efficiency as a function of frequency with emphasis on peak resonance. I don't have high hopes but fun to see the numbers
Would love to see a short of these fun moments! Bits with your underpants wind turbine, and you yelling into the tube.. stuff like that. Would be a really hillarious thing for members!
A while back, I taped some piezo chips on a brass bowl and hit it like a bell. The energy out kind of followed a sound wave. Might have to try that again...
That's really cool. It makes me think about how some industrial processes---like the milling done in cement production---are just continuously loud, 24/7, and in such an environment you might get quite a bit of energy for low-voltage devices while reducing the amount of noise pollution somewhat.
I could easily see this princaple being used as a sound damping wall that happens to pay for its maitance costs via energy harvesting. How nice could it be to have cities a bit quiter, roads to not feel so abrasive from tire and exsaust noise and to get a bit of energy out of the deal too
Next time, tape the cellophane to the table with single-sided tape, and then simply press the horn down onto it. "No slip, and tightness guaranteed." Now we just need a Low Temp Thermo-Acoustic Generator. Let's scale this puppy up.
Imagine an array of these along the highway! Where the have large concrete barriers to quieten the highway for neighborhoods and such! This can reduce the wall mass. Aswell as giving it another reason to exist. While getting something from it! Maybe have a chamber on the back side with a slight vacuum, or low pressure inside, and a large diaphragm like 12'-16' with a coil and magnet setup to be efficient and most effective at generating. I have seen large windows move nearly 2" in the center when large loud trucks drive by. A mile or more with these along the highway should generate a few kw! Possibly 4-6kw per mile, make them easy to repair or replace if damaged, a bent sheet metal frame with a focusing cone from fiberglass or something, and a fiberglass sheet diaphragm with a iron and magnet pole structure with a coil around it, similar to a large speaker, only the magnet may be on the cone/diaphragm! Even 0.5 amps at 1.2kv could be nice especially with 100 of them plus, feeding a capacitor bank, connected to a grid tie inverter, maybe have pv arrays along the top to protect them from weather slightly, adding to the power this could be 50-100 amps per mile x1200v especially for rush hour that's alot of watt hours! It may be reduced to 10 % of that 80% of the day, but it could be charging a battery getting ready for the peak load of the afternoon!
Cool, you should test a speaker, (one of the small Bluetooth ones) on the end of the horn with vent holes facing back towards the speaker from the diaphragm. Use a frequency generator to see what frequency works and what kind of wave or interference you could add. Free apps on your phone for frequency generator.
Ah Rob. If Edison could power a drill, we could send energy to a battery. There are lots of sounds in the environment. I reckon the sounds of cicadas in summer at dusk could probably boil a kettle (or so it seems).
I've been telling my kids about my reverse speaker idea for years. You could implement a Monsters Inc type setup and power the world! Hopefully there's more energy in a child's scream then football stadium roar.
I think, its not just driver resonance, but horn shape resonance as well, ELF's are all around us and we do not notice them being below threshold of hearing, so in theory if you could get a very large diaphragm (garden size or greater) you might be able to pick those up and get significant amounts of energy.
long answer: there's a lot of stuff to consider, short answer: yes. In fact if you put it let's say on a car heavy area they usually sound around certain range of frequency so you build the entire contraption to resonate with that which so far I have no idea how to do it, but yeah it will capture extra energy.
I just had an idea. If you make the diaphragm from a ferrous material and put a magnet with a coil around it won't the reluctance switching cause a voltage output from the coil? That way you don't have to move the heavy magnet or the cumbersome coil. It should vibrate easier. Maybe vacuum deposit steel on mylar?
Try connecting speaker wires to incandescent household light bulb 200w or an small DC motor you can hear the music and the light will try the Flash but the motor will only vibrate and you can use a speaker for a microphone and vice versa but it will probably ruin the microphone
Hi Rob - nice one. The diaphragm will have a resonant frequency, if you can find that the energy required should be much much less. Is it worth perhaps using a frequency sounds generator of done kind? I'm sure the results would be astounding if you can get on the right frequency. As in the breaking of wine glasses by an opera singer! Please keep up the good work. Clive F.
Why not forget the horn and sound, but use the vibration generation with different driver?. How about replacing horn with rotating wheel with alternating magnets, maybe driven by wind. And coat the source side of the membrane with graphite? Being paramagnetic, the graphite covered membrane will vibrate back and forth as the alternating magnetic fields pass over it. I would presume that the membrane diameter could be greatly reduced as it would not need the area to catch the sound waves.
Seeing the phonomotor working made me think. If you can create power using the vibrations of air, wouldn't water do the same? A similar enough design or modification of the current one might allow the use of water as the transmitting medium and seeing how its not compressible it should transmit more of the energy. Bit like the glass of water in the movie Jurassic Park, strong enough vibrations from any source should cause the magnets to vibrate sympathetically.
Isn't sound to electricity conversion is what a microphone does? It seems like a stirling or other vibrating source would be better than random pulsations as an energy input -- we'd need sustainment over time for useful energy output.
Creative people are Happy people! BTW, has anyone caught Nassim Harramein and the new Unified Field Theory? He theory describes the ultimate in energy scavenging.
When you tapped the ‘drum’ you got a frequency, if you bark that frequency down the horn you may get more power. If true, then there may be a way to alter a frequency coming in to the horn to scavenge more energy. Could you also have multiple horns of different sizes nested on he drum?
I’ve been thinking about a pole with a magnet on the top, make the pole move via resonance and have the magnet pass copper coils…no idea if it would work but in my little lizard brain it makes sense.
you know when youre driving down the highway with 1 window cracked and u can hear the standing pressure wave inside the cabin thump in your ears? what if u blow wind across the horn? will a standing pressure wave form and wiggle the membrane?
What if you put these on a beach with a substantial surf breaking regularly. That sound has some base to it and would move the membrane quite a bit. The other benefit is that the sound is and always will be free and there?
Should make a portable version with analogue volt meter. Where I stay, I'm thinking you could walk around shouting into it,"BUM,BUM,BUM,BUM,BUM" at folk all day long. Call it the Bum Detector🎉🎉
To tell you the truth, i wasn't so sure you will be able to light that LED. That was a surprise 😁 Long time ago i saw an article about an experiment with acoustic cooling. They made at least one refrigerator that was cooled without an external power source and they put it in a subway. I was looking for that article a few months ago, but I couldn't find it😔
Now, can we increase the power by using lever action giving more coil displacement? How about making this a rain-water electric generator?, the force of rain more significant than sound waves, thats got to equate to magnitudes or order greater power?
So if I point it at my furnace which also runs the plenum for my air conditioner too scavenge some of the energy back? Perhaps if you attached it to a load vibrating machine like a furnace?
What if you put the front plate back on the rose generator and attached a cone shape like this to front hole as a wind catcher? The flat front plate that wastes most of the wind would then be in the wind "shadow" of the cone.
There is an emergency horn on thingiverse that uses a balloon as the vibrating membrane and takes very little blow power... If you print it at 200% it is like a fog horn and really loud. I wonder if rubber instead of cellaphane would work better....?
I believe you could reverse engineer a microphone electret condenser which would be simpler and can achieve much greater results. For a energy scavenging source I would use a microphone feedback effect. whenever the sound entering a microphone is reproduced by a loudspeaker, picked up by the microphone, and re-amplified again and again which continues to build up huge amount of acoustical vibrational energy to distort the diaphragm transducer which has shown to generate infinite electrical potential from its positive feedback loops as it constantly produces standing waves within its resonant sweet spot. In other words. The acoustical energy would be far greater than what you initially put in without defying the laws of conservation
probably not - it won't be more efficient but it would move in a lighter breeze but with the magnet on the film it acts as a kind of spring so it will oscillate longer whereas the coil will be lighter - easier to move but won't oscillate as long - the efficiency is to do with the distance between the coil and the magnet
what about airports of freeways .. also have you ever thought of combining all these "free energy sorces i am sure water +wind+ solar + sound + heat cpu;d be used to generate tons of "free power "
May I ask that: if the correct frequency of sound was found to produce the most current? I also think that your idea of the capacitor before the load would also increase output. Thank you Robert very interesting.
I guess this could be really handy if your neighbour with an annoying, constantly barking dog. It'll be still annoying as Heck but at least you get some free energy out of it... 😅
I need your help, I'm a radioham when I'm listening on vhf fm 145. 5000Mhz . I recieve a signal about signal 4 , then I hear a car pass going through gears & speed possibly, I'm picking up his alternator reflecting to my antenna, then the signal 4, then rises to a stronger signal to 9 or end Stopping, vehicle goes signal goes. I Want to be able to tap into this some how Steve Wolverhampton
I don't know why you want to make the diaphram tight. Surely you make it lose like with a rubber balloon so it can be more compliant to the sound waves and allow the coil and magnet combunation to have as much movement possible by the sound.
@@ThinkingandTinkering Many years ago I had access to a super high speed camera. While playing with it I recorded vibrations of various things by the impact of sound waves. On playback of the video I found the distance of travel of a membrane was greater with things like rubber balloons verse thick plastic or Celopane and even less when directing the sound to a 3mm piece of hard board. On playing back the video I realised that is why speaker and microphones have corregations around the cone so as to make it more complient to the sound waves.
I think you would get a much more practical output from a constant sound rather than repeated individual shouting. I bet a wall of these on a highway divider could power the streetlights.
Hey Rob; what would you say would happen if you smacked 2 matched tuning forks at the mouth of your collector and gave a think about what would happen when you held them together? Curious as to your thoughts mate!
When you tapped it, it made a tap and a tone. Trying singing that tone into it.
Yes to catch the resonance. Also playing a test tone from a speaker we might be able to get a rough idea of the efficiency as a function of frequency with emphasis on peak resonance. I don't have high hopes but fun to see the numbers
I know a barking dog that could power Blackpool with that 😂
Just hook it up to any husky!
I see a bark collar that you place battery in and retrieve once charged and alternate with spent batteries,.lol.
@@OligosFewor just keep the battery in the collar and make a usbport on it, so you can charge your phone while walking the dog...
@@OligosFewyou’re barking up the wrong tree lol. Maybe try harnessing the power of a Springer Spaniels waggy tail next ?
@@leewotsurely you can also give him some shoes that generate power with each step
if only we could strap these to our politicians, we could solve the energy crisis
We'd be better using their speeches to feed a Methane generator.
😅 the outcome - reduced taxes
Lmfao, they would add it to their tax offsets.
Incredible! These past legacies shouldn't be let go unutilized.
Love it... I'm guessing you have a lot of those "What the hell am I doing?" moments when exploring... lol... I absolutely love your passion!
lol - yes I do lol
Would love to see a short of these fun moments! Bits with your underpants wind turbine, and you yelling into the tube.. stuff like that. Would be a really hillarious thing for members!
Definitely outside the box thinking, thankyou Robert like my Dads old wristwatch that never needed winding lost technology.
Perfect when kids are running around and shouting in the house.Would also work perfectly in night clubs. Thank you for the upload!
We need some of those at an Iron Maiden concert
Now find it's resonance and watch the voltage rise.
A while back, I taped some piezo chips on a brass bowl and hit it like a bell. The energy out kind of followed a sound wave. Might have to try that again...
That's really cool. It makes me think about how some industrial processes---like the milling done in cement production---are just continuously loud, 24/7, and in such an environment you might get quite a bit of energy for low-voltage devices while reducing the amount of noise pollution somewhat.
- a mini vortex cannon to fire down the horn - classic pair..
On the other hand: "let there be light" - it was done, one yell at a time.
I could easily see this princaple being used as a sound damping wall that happens to pay for its maitance costs via energy harvesting.
How nice could it be to have cities a bit quiter, roads to not feel so abrasive from tire and exsaust noise and to get a bit of energy out of the deal too
Next time, tape the cellophane to the table with single-sided tape, and then simply press the horn down onto it.
"No slip, and tightness guaranteed."
Now we just need a Low Temp Thermo-Acoustic Generator.
Let's scale this puppy up.
Imagine an array of these along the highway! Where the have large concrete barriers to quieten the highway for neighborhoods and such! This can reduce the wall mass. Aswell as giving it another reason to exist. While getting something from it! Maybe have a chamber on the back side with a slight vacuum, or low pressure inside, and a large diaphragm like 12'-16' with a coil and magnet setup to be efficient and most effective at generating. I have seen large windows move nearly 2" in the center when large loud trucks drive by. A mile or more with these along the highway should generate a few kw! Possibly 4-6kw per mile, make them easy to repair or replace if damaged, a bent sheet metal frame with a focusing cone from fiberglass or something, and a fiberglass sheet diaphragm with a iron and magnet pole structure with a coil around it, similar to a large speaker, only the magnet may be on the cone/diaphragm! Even 0.5 amps at 1.2kv could be nice especially with 100 of them plus, feeding a capacitor bank, connected to a grid tie inverter, maybe have pv arrays along the top to protect them from weather slightly, adding to the power this could be 50-100 amps per mile x1200v especially for rush hour that's alot of watt hours! It may be reduced to 10 % of that 80% of the day, but it could be charging a battery getting ready for the peak load of the afternoon!
Today I saw an Englishman yell. Tomorrow Pigs shall Soar gracefully through the skies. We live in interesting times.
Sounds to me like one could fashion one into hat apparatus , go to a Rock Concert, and charge a cellphone with it while you "boogie"!!!
Cool, you should test a speaker, (one of the small Bluetooth ones) on the end of the horn with vent holes facing back towards the speaker from the diaphragm. Use a frequency generator to see what frequency works and what kind of wave or interference you could add. Free apps on your phone for frequency generator.
It's official. Rob is British.
Thank you sir, very fun and function, great como, I like that you share your geniality and those of others, best of luck
Useful on the side of a motorway collection all that noise
Love the new cam angle
and there is is, Robert has gone 'barking mad'! lol
Hey, Rob! Cant help! Think about the film 1771! Now it's okay to talk about sounds! / Mikael
s
Lookes like a human ear which convert sound to vibration then to electrical signal for brain
Bob is wondering just what in Hades has you yelling his name so vehemently, lol!
I'm so glad your touching a little on RF energy! # Gerrard Morin
Ah Rob. If Edison could power a drill, we could send energy to a battery. There are lots of sounds in the environment. I reckon the sounds of cicadas in summer at dusk could probably boil a kettle (or so it seems).
How big of a machine would it take for that?
Rob, auditioning for a part in Dune, has yet to find his own Killing Word.
lololol - oh very good
I've been telling my kids about my reverse speaker idea for years. You could implement a Monsters Inc type setup and power the world! Hopefully there's more energy in a child's scream then football stadium roar.
Rumor has it, if you yell offensive words, it'll produce more energy. The more offensive they are, the more energy the device will produce 😶
RMS, of course there is energy in sound. Look at the Battle of Jerico and the 'walls came a tumbling down'!
would finding the resonant frequency of the diaphragm for the sound make more energy ?
I think, its not just driver resonance, but horn shape resonance as well, ELF's are all around us and we do not notice them being below threshold of hearing, so in theory if you could get a very large diaphragm (garden size or greater) you might be able to pick those up and get significant amounts of energy.
long answer: there's a lot of stuff to consider, short answer: yes. In fact if you put it let's say on a car heavy area they usually sound around certain range of frequency so you build the entire contraption to resonate with that which so far I have no idea how to do it, but yeah it will capture extra energy.
@@maouplulax "Lot of stuff to consider" is an answer from someone who doesn't know that is trying to pretend they do know) hehe.
I just had an idea. If you make the diaphragm from a ferrous material and put a magnet with a coil around it won't the reluctance switching cause a voltage output from the coil? That way you don't have to move the heavy magnet or the cumbersome coil. It should vibrate easier. Maybe vacuum deposit steel on mylar?
Excellent 👏👏👏
Try connecting speaker wires to incandescent household light bulb 200w or an small DC motor you can hear the music and the light will try the Flash but the motor will only vibrate and you can use a speaker for a microphone and vice versa but it will probably ruin the microphone
Crazy getting a voltage by shouting but it was fun to watch. Thanks for the laugh. lol
Of course you can drill a hole with that. It will just take a very long time :)
Hi Rob - nice one. The diaphragm will have a resonant frequency, if you can find that the energy required should be much much less. Is it worth perhaps using a frequency sounds generator of done kind? I'm sure the results would be astounding if you can get on the right frequency. As in the breaking of wine glasses by an opera singer!
Please keep up the good work. Clive F.
Now if you could that with a dog whistle I'd be impressed 😂
"Why are you yelling?" 😂
lol ridiculously cool
There's bound to be a resonant frequency in the skin material, have you tried do-ray-me-fa-so-la-ti-do at it? (Sorry Robert's neighbours 😂)
Robert, you outdone yourself once again👌 great job pal, keep it up 😎👍!
Why not forget the horn and sound, but use the vibration generation with different driver?.
How about replacing horn with rotating wheel with alternating magnets, maybe driven by wind. And coat the source side of the membrane with graphite?
Being paramagnetic, the graphite covered membrane will vibrate back and forth as the alternating magnetic fields pass over it. I would presume that the membrane diameter could be greatly reduced as it would not need the area to catch the sound waves.
Seeing the phonomotor working made me think. If you can create power using the vibrations of air, wouldn't water do the same? A similar enough design or modification of the current one might allow the use of water as the transmitting medium and seeing how its not compressible it should transmit more of the energy. Bit like the glass of water in the movie Jurassic Park, strong enough vibrations from any source should cause the magnets to vibrate sympathetically.
Seems like it could be incorporated into a water ram pump.
put one at the bottom of a waterfall, its the only way to be sure lol
That shape reminds me of old hearing horns
Crystal and dynamic microphones produce voltage. *Condenser and carbon microphones do not. They require a powersupply to produce an output.
Isn't sound to electricity conversion is what a microphone does? It seems like a stirling or other vibrating source would be better than random pulsations as an energy input -- we'd need sustainment over time for useful energy output.
A ribbon microphone comes to mind.
Love it Robby! So, i know oasis from wholesale floral sales, here you mention cellophane and florists...domestic influencer?
I bet this could replace the alternator on your car. It could be mounted just ahead of the muffler and would use otherwise wasted energy.
You can give those to the nuthouse and rename it from an asylum to power plant
Creative people are Happy people!
BTW, has anyone caught Nassim Harramein and the new Unified Field Theory? He theory describes the ultimate in energy scavenging.
Print me a bunch of different drums like that mate, if you make them generators I'll power the whole intergalactic railway with it
When you tapped the ‘drum’ you got a frequency, if you bark that frequency down the horn you may get more power. If true, then there may be a way to alter a frequency coming in to the horn to scavenge more energy. Could you also have multiple horns of different sizes nested on he drum?
I’ve been thinking about a pole with a magnet on the top, make the pole move via resonance and have the magnet pass copper coils…no idea if it would work but in my little lizard brain it makes sense.
Helmholtz Resonators.
you know when youre driving down the highway with 1 window cracked and u can hear the standing pressure wave inside the cabin thump in your ears? what if u blow wind across the horn? will a standing pressure wave form and wiggle the membrane?
if you shape the horn correctly it should work like blowing over the rim of a bottle
Could just use a basic wind turbine and produce alot more energy
@@ashleydines144 yeah but solid-state wind generation is a nifty idea isnt it? no moving parts means no less wear and replacing
@byrdhartley9014 the sound machine has moving parts
A large organ pipe or similar and some wind might give some energy I don't think the neighbour's would like it in the garden though.
What if you put these on a beach with a substantial surf breaking regularly. That sound has some base to it and would move the membrane quite a bit. The other benefit is that the sound is and always will be free and there?
Soccer are useful, now!
With the constant sound in some facilities I've worked at I wonder what you could generated in a year
Try a stack of diaphragms and opposing magnets with coils. Like a deck of cards.
Now they use traveling waves for piezo electric motors.
Should make a portable version with analogue volt meter. Where I stay, I'm thinking you could walk around shouting into it,"BUM,BUM,BUM,BUM,BUM" at folk all day long. Call it the Bum Detector🎉🎉
To tell you the truth, i wasn't so sure you will be able to light that LED. That was a surprise 😁
Long time ago i saw an article about an experiment with acoustic cooling. They made at least one refrigerator that was cooled without an external power source and they put it in a subway. I was looking for that article a few months ago, but I couldn't find it😔
Now, can we increase the power by using lever action giving more coil displacement?
How about making this a rain-water electric generator?, the force of rain more significant than sound waves, thats got to equate to magnitudes or order greater power?
So if I point it at my furnace which also runs the plenum for my air conditioner too scavenge some of the energy back? Perhaps if you attached it to a load vibrating machine like a furnace?
What if you put the front plate back on the rose generator and attached a cone shape like this to front hole as a wind catcher? The flat front plate that wastes most of the wind would then be in the wind "shadow" of the cone.
There is an emergency horn on thingiverse that uses a balloon as the vibrating membrane and takes very little blow power... If you print it at 200% it is like a fog horn and really loud. I wonder if rubber instead of cellaphane would work better....?
I believe you could reverse engineer a microphone electret condenser which would be simpler and can achieve much greater results. For a energy scavenging source I would use a microphone feedback effect. whenever the sound entering a microphone is reproduced by a loudspeaker, picked up by the microphone, and re-amplified again and again which continues to build up huge amount of acoustical vibrational energy to distort the diaphragm transducer which has shown to generate infinite electrical potential from its positive feedback loops as it constantly produces standing waves within its resonant sweet spot. In other words. The acoustical energy would be far greater than what you initially put in without defying the laws of conservation
This sounds like it could be the basis of either the stupidest or coolest machine of the decade.
@@gaemr_o5147 So sayeth the amateur gamer having an IQ lower than your 2D RAM space lol
Realistically though, anyone living close to the sea could have an unlimited supply of free energy.
Might be more efficient to attach the diaphram to a lightweight coil and surround it with the magnets
probably not - it won't be more efficient but it would move in a lighter breeze but with the magnet on the film it acts as a kind of spring so it will oscillate longer whereas the coil will be lighter - easier to move but won't oscillate as long - the efficiency is to do with the distance between the coil and the magnet
Great explanation - Thanks 👍
Time to set these up around rocket launch sites
what about airports of freeways .. also have you ever thought of combining all these "free energy sorces i am sure water +wind+ solar + sound + heat cpu;d be used to generate tons of "free power "
my first thought was freeway noise dampining with some bonus energy harvesting!
Alan....Alan...ALAN...*ALAN*...***ALAN***
Thus, the microphone was reinvented, no ?
Your videos are so interesting 👍✅
consider crystal radio input.
May I ask that: if the correct frequency of sound was found to produce the most current? I also think that your idea of the capacitor before the load would also increase output. Thank you Robert very interesting.
You could put the original version with the flywheel on and when you are listening to your music the speaker would be driving the flywheel?...
I wonder if it could be connected to some sort of wind whistle.
Can I suggest that you place your led through a hole in a black card so we can see it more clearly in contrast ?
😂😂😂😂😂 thank you for the video 😅
I use something similar for a thermoacoustic Stirling engine
Got lots on I noisy neighbours😂😂😂
❤
So you made a micro phone. Some of the old microphones produced about 0.7v
was there a scientific reason for the shout of Bum? ie is it a word that contains more energy?
I guess this could be really handy if your neighbour with an annoying, constantly barking dog. It'll be still annoying as Heck but at least you get some free energy out of it... 😅
the glass is half full mate lol
He should use piezoelectric generators instead of magnets and coils.
I need your help, I'm a radioham when I'm listening on vhf fm 145. 5000Mhz . I recieve a signal about signal 4 , then I hear a car pass going through gears & speed possibly, I'm picking up his alternator reflecting to my antenna, then the signal 4, then rises to a stronger signal to 9 or end Stopping, vehicle goes signal goes. I Want to be able to tap into this some how Steve Wolverhampton
I don't know why you want to make the diaphram tight. Surely you make it lose like with a rubber balloon so it can be more compliant to the sound waves and allow the coil and magnet combunation to have as much movement possible by the sound.
the rubber will act like a damper mate and absorb the energy rather than transmit it
@@ThinkingandTinkering Many years ago I had access to a super high speed camera. While playing with it I recorded vibrations of various things by the impact of sound waves. On playback of the video I found the distance of travel of a membrane was greater with things like rubber balloons verse thick plastic or Celopane and even less when directing the sound to a 3mm piece of hard board. On playing back the video I realised that is why speaker and microphones have corregations around the cone so as to make it more complient to the sound waves.
I think you would get a much more practical output from a constant sound rather than repeated individual shouting. I bet a wall of these on a highway divider could power the streetlights.
Put a speaker facing in or out on the open end, play music.
Nice!
Could this be used to capture energy from droplets as the mass of droplets should create a greater impact
Barking dog power plant.
Hey Rob; what would you say would happen if you smacked 2 matched tuning forks at the mouth of your collector and gave a think about what would happen when you held them together? Curious as to your thoughts mate!
i wonder how much it would generate if you blow your windblower into it .. I mean winds generate vibration ..
or also cover up the 'receiving' side and put it under water (rain) drops ..