How to Make Piezoelectric Crystal Speaker

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I make a loud speaker for a clock radio using a piezoelectric crystal. Actually I experiment with a variety of piezo crystals. That includes a piezoelectric igniter crystal from a BBQ lighter and a homemade/DIY rochelle salt piezoelectric crystal. I also try out a piezo buzzer from Radio Shack and also a crystal earpiece normally used with a crystal radio. To increase the voltage coming from the radio I first try stepping it up using a doorbell transformer and then I use a microwave oven transformer.
To see my follow-up video "Piezoelectric speaker - small crystals/window as speaker" for a demonstration using a smaller crystal and using a window as a speaker, click here:
• Piezoelectric Speaker ...
For a video on how to get a piezoelectric igniter crystal from a BBQ lighter, see:
• How to get Piezoelectr...
For getting an igniter crystal from a hand lighter, see:
• How to take Piezoelect...
For how to make a rochelle salt piezoelectric crystal using stuff from your kitchen, see:
• How to make Rochelle s...
For showing how to light an LED using a piezo crystal from a gift card, see:
• Piezoelectric generato...
For using a crystal earpiece or a piezo buzzer with a crystal radio, see:
• Crystal Radio Troubles...
And lastly, see the piezoelectricity section of my website:
rimstar.org/mat...
To follow me on Twitter:
#!...
rimstar.org

Опубликовано:

9 сен 2024

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Комментарии : 244

@liecretsev 5 лет назад

Im here after Senku made a speaker out of rochelle salt. Crazy

@peterpeter2370 4 года назад

can be the only reason best freaking series ever made

@justaway_of_the_samurai 4 года назад

I came here after watching the anime episode where he did the same. Small World.

@gauravdumoga5988 4 года назад

Same here 🤗

@milesprower6641 4 года назад

same owo

@connerd5647 4 года назад

it sparked a love in me of practical chemistry and physics I wish I had when I was a kid

@agumonkey 6 лет назад

Honestly, even today, it's as magical as it can be. Crystal of voices far away

@JustinHallPlus 12 лет назад

I never thought of using a MOT to push a Rochelle Salt Crystal! I will be trying this for sure! thanks for the video!

@RimstarOrg 12 лет назад

And I tried that too. Wow, what a result! Very clear and loud. From the tips I'm getting from these comments I think there's going to be a follow-up video sometime in the future after I play around a bunch more. Thanks!

@RimstarOrg 12 лет назад

Sounds like a great way to light up outdoor Christmas trees or just year round nighttime decorations without using utility power.

@DigGil3 11 лет назад

PS.: I was reading a Forrest Mims' book where it was described a device which is made of a can with an aluminium foil membrane which reflects light differently (varying intensity at a specific spot by varying the focal point, I guess) as sound enters the can. I think you could merge this with your speaker and and then use a LDR to amplify the sound!

@RimstarOrg 12 лет назад

Oh cool! This is the first I've heard of these. Neat way of doing a very low mass diaphragm.

@DoNotPushHere 11 лет назад

You increased the voltage in order to make the crystal work, and that makes me wonder: how many volts does it need? And how many volts does a regular gift card use? Thank you very much! All your stuff is really inspiring

@RimstarOrg 12 лет назад

Glad to hear you enjoyed my vid. The crystal I used in the vid was made in two stages. I grew a small crystal from a first batch and the used that as a seed suspended in a beaker in a roughly temperature controlled environment to grow a larger one. It's been through a lot over the years and this past week it finally broke so the one in the vid is actually 3/4 the size it used to be. Make sure you post a vid of you crystal in action. I'm already subbed so I won't miss it.

@jeriellsworth 12 лет назад

Cool! Fun intro.

@mheermance Год назад

This is probably the safest project built with a microwave oven transformer.

@RimstarOrg Год назад

Ha ha! Very true!

@materialvision 3 месяца назад

@@RimstarOrg Hi, could you elaborate a bit on the safety of it? Is it safe because it will not draw much amps? Other sources claim that the high voltage may be dangerous anyway...

@ajanki34 7 лет назад

I think the bigger the crystal the more attenuation of the sound occurs because it needs more electricity to vibrate more of the crystal in order to transmit the sound waves at higher amplitudes. I think that's why the yellow ear piece worked so well. You might have better luck if you make the crystals in small pieces, rather than larger cube shaped blocks.

@RimstarOrg 12 лет назад

That got it. And wow, I'm learning tonnes from your pointers! Thanks! Reading wikipedia's description it sounds like the same principle as impedance matching for increased energy transfer efficiency in electronics.

@RimstarOrg 12 лет назад

Thanks! Glad you enjoyed it!

@RimstarOrg 11 лет назад

LOL. Actually the alarm clock stopped working a long time ago, but the thing that stopped working was that it wouldn't always go off at the right time or at all. The annoying wakeup sound and the radio still work.

@RimstarOrg 12 лет назад

Thanks! It's the non-teacher side of me trying to break free. :)

@RimstarOrg 11 лет назад

A piezo crystal is one where if you apply a voltage to it then it will change shape. It'll do this briefly and only when the voltage is first applied. In this video the crystal is connected to the output of the radio. The radio's output is a constantly changing voltage so it it constantly changing the shape of the piezo crystal. This changing shape vibrates the surrounding air. That creates sound waves which you hear.

@RimstarOrg 12 лет назад

Not necessarily. I have some small crystals, around 1/4" or 5mm, that are all uniform. I've seen photos of much larger homemade ones. My big one isn't so uniform but if I broke it apart I'd still have some large uniform ones. One difference would be in the shape. It's hard to make a large flat crystal like the disk shaped ones in the piezo buzzer, gift card, or crystal earpiece, or cylindrical as I think the piezo igniters contain. Some bought ones also have a larger piezo effect.

@RimstarOrg 11 лет назад

Glad you liked it. The Rochelle salt I used is actually a pretty weak piezoelectic crystal so I imagine pretty much any crystal that's piezoelectric will work, granite for example. At 6:20 in the video I demonstrate using a piezoelectric crystal taken from a BBQ igniter. I know nothing about using them for therapy.

@MilanKarakas 10 лет назад

Actually, to get more sound PRESSURE out from the piezo crystal (at your video, starting from 6:45), you should to put cone in opposite fashion - so that narrow end is attached to the crystal, and wide end to the room. What happened in your case is the Bernoulli effect - fluid (air) become accelerated, but in the same time pressure goes down. You need the opposite effect - fluid slowing down, but sound pressure going up. Is that make sense to you? Thank you in advance for your answer, milan ---

@sciencestararvinsinghk 5 лет назад

@wally crail 4 years now.

@bobtakealook6420 4 года назад

5 years

@maximilianobournissent9876 4 года назад

@@bobtakealook6420 6 and counting

@bruce_daddy 2 года назад

7 years, people. experimenting with microwave oven transformers.. all I'm saying.

@magicsasafras3414 2 года назад

@@maximilianobournissent9876 7 now

@RimstarOrg 11 лет назад

Interesting idea. I'll add it to the todo list.

@RimstarOrg 11 лет назад

Interesting. But there must be a tradeoff for the greater amplitude at the other end of the needle. I guess as long as the force at the piezo end is great enough then there'll be enough left. I'll have to try this. Thanks.

@RimstarOrg 12 лет назад

I just used what I had already on hand. I took it out of a microwave oven years ago and I think this is the first time I found a use for it. Let us know how it goes!

@RimstarOrg 12 лет назад

Thanks! I made the crystal. It's rochelle salt. See my video "How to make Rochelle salt piezoelectric crystal". There's a link to it in the description below this video and one at the end of the video (if you have annotations available.) Actually, that process results in smaller, but still working crystals (see my "Piezo Speaker (continued)" video). To make the big one I took one of the small ones and used it as a seed crystal to grow the bigger one. Unfortunately I never documented that step.

@kyinchi 3 года назад

Wow. That’s the coolest thing I’ve ever seen IML

@RennieAsh 11 лет назад

Once I made a speaker using a piezo from an old watch - it was already attached to the metal backing plate so I just stuck (screwed) that to a piece of wood and there I had a piezo speaker! I didn't need hundreds of volts but I guess they aren't the same as those crystals. You can also just get these things out of 90's boombox stereos since they loved using piezo tweeters back then ;-) In fact maybe we could make a line array or planar type speaker out of them lol

@Slider2732 12 лет назад

Enjoyed that, good tip with the MOT too. Am growing some crystals at the mo, intending to make a homemade earpiece for a homemade crystal set. Got the container under the fridge door, otherwise it's been 105F here in OK. Only seeing evaporation after a week though. Your rock looks made by De Beers !

@7EsoTeriC7 11 лет назад

Ill look up the electrophoresis you mentioned. Just at a spectrum of my preps that involves not having access to batteries or electricity and needing an electrical spark. Mechanical energy is fine, just something on the smaller side. I'm sure if I find a small electric motor and crank backwards its like the same thing.... thanks for the reply to.

@RimstarOrg 11 лет назад

Glad you like it!

@RimstarOrg 11 лет назад

If yours is quiet and you're talking about the rochelle salt crystal then my feeling is it won't work. But it might with the piezo crystals from the igniter and lighter or the disk crystal from a gift card and definitely with the piezo buzzer.

@RimstarOrg 11 лет назад

What do you mean? The whole idea is to have the vibrating piezoelectric crystal generate sound. How would transistors be used?

@RimstarOrg 11 лет назад

Sketchy in what way? You heard the difference between the two transformers. Or did you just not like that the larger transformer made the improvement?

@RimstarOrg 11 лет назад

Oh, the speaker on the clock radio works fine. The only thing wrong with it is that the alarm goes off at random times, hence my willingness to open it up. This whole thing was done just for an interesting experiment. Lots of people, including me, are interested in what you can do with a homemade Rochelle salt piezo crystal. It's limited, but lots of fun to do. And that's all it is, for fun.

@RimstarOrg 12 лет назад

Because I didn't think of it. I just did it now and didn't see much difference. I think I'd have to open up the buzzer's plastic case and extract the piezo crystal/disk itself and put that on the can. I don't want though because it looks like I'd have to cut the case and I want to keep it intact. Too bad the piezo disk I got from the gift card is no longer usable. I'll have to find another one.

@RimstarOrg 11 лет назад

No, unfortunately not. Even if you give it a sudden hard press but maintain the pressure, you still only get the voltage at the initial press and it quickly dampens out in the form of a dampened wave, alternating polarities until there's no more.

@RimstarOrg 11 лет назад

I've never been able to. I have from the BBQ igniter of course, but the Rochelle salt crystal's output is a lot weaker.

@RimstarOrg 11 лет назад

We all get deafer as we age. :) I can hear it fine. I understand your frustration while I'm talking though. Had the same experience sometimes with other videos.

@omsingharjit 6 лет назад

you should use can as electrode and other up side , with large surface of Crystal for loud sound

@RimstarOrg 12 лет назад

Hmmm... fun, school science projects, learning experience (I definitely learned from this, some from the comments below, and will learn more as I work on further versions.)

@RimstarOrg 11 лет назад

Possibly, if you pick up radio stations quite loud. Mine is too quiet - probably too short of an antenna.

@RimstarOrg 12 лет назад

For fun, and to learn, and to show how it can be done.

@deltaxcd 10 лет назад

There is no need to use specific crystal, any dielectric will do the job. putting 2 aluminium foils close to each other and leaving 1mm ring gap should make quite decent loudspeaker. replacing one foil with wire mesh would work even better

@RimstarOrg 11 лет назад

I thought you were going to say you wanted to use the quartz for the speaker. I've never tried that but quartz is piezoelectric so it might work. But putting quartz inside a lighter in place of the existing crystal? I don't know if it would produce sufficient voltage to create the arc at the spark gap to ignite the gas. Test first to see which sides to impact & which sides will have the voltage across them. A voltmeter will work there. See my Rochelle salt testing video, though I use a scope.

@RimstarOrg 11 лет назад

I'm guessing you mean for transformer that has a primary coil and a secondary coil... The coil with more turns has the higher voltage. You need more voltage to the piezo.

@omsingharjit 4 года назад

You should place the crystal , facing its electrode touching the can surface to get higher vibration.

@RimstarOrg 11 лет назад

I don't know why your comment was marked as spam. I only just saw it now. Unfortunately I don't know if you can do what you want to do.

@MrMaverickstar 12 лет назад

transdusers can be put on windows to make the window a speeker

@RimstarOrg 11 лет назад

I tried looking for it but I can't find it now. I remember something like the end of a toothbrush with a piezo crystal. When the piezo crystal vibrated it moved the toothbrush across the table.

@RimstarOrg 12 лет назад

I couldn't find anything on "branch compression chambers" so if you have a link, please send it to me in a private message (links don't work in comments) or give me some search terms. I did learn about phase plugs though. Thanks! I got the idea for the cone from the crystal earpiece - but I can't seem to find the reference anymore. I opened up one of my earpieces and it has a much shorter cone like this inside.

@RimstarOrg 11 лет назад

Well, there's always an external power source but if it's okay if it's mechanical energy provided by you then make something like "flint spark torch igniter" (do a google search.) Or building up charge using an electrophorus is a more science experiment type of way to do it. Or rub your feet against carpet and then touch a doorknob (though the spark is pretty faint.)

@power-max 12 лет назад

Now make a singing arc speaker for your alarm you'll get a nasty surprise trying to snooze ;-)

@RimstarOrg 11 лет назад

Yes. Or another way of putting it is that I'm using the piezos to turn electrical energy into mechanical energy.

@RimstarOrg 11 лет назад

Good question. Sadly, I don't know.

@TechsScience 6 лет назад

i am making scientific videos here can you please support me?

@chronobot2001 4 года назад

It would be cool if you could make a practical crystal oscillator or crystal filters using homemade crystals

@omsingharjit Год назад

That's what I wanna do

@chronobot2001 4 года назад

Goodwill is a good source for cheap alarm clock/radios

@IronPearlCHI 11 лет назад

Very intersting! will this work with a normal crystal instead of salt?.instead of putting all the gadgets to make sound higher could this be used for therapy would it emmit some healing viberations if maybe plugged to the right sounds and how far you got to be away from it?? much appreciated im a therapyst it would be helpful to get your views thank you

@Naomi_Boyd 11 лет назад

The limiting factor here is not necessarily the amount of energy you put into the crystal but rather the distance the crystal will move when it vibrates. Piezoelectric crystals vibrate with a lot of force but over a very small distance. The trick would be to convert that force into motion. Try attaching a lever (maybe a sewing needle) to the crystal. Put the pivot point close to the crystal and attach the other end of the needle to the diaphragm of one of your cones, and rock out dude. lml

@MrMaverickstar 12 лет назад

hi rip how come you never put the buzzer transduser strat on the back of the can, surly this would have been a better and louder specker

@coondogtheman 3 года назад

What if you hooked the radio to the doorbell transformer like you had it in the first part and then the output (the 120V side of the doorbell transformer) to the 120V side of the microwave transformer and then try the crystal on the secondary. Watch out, you might have arcs. Back in 1997 my art teacher in school had that same alarm clock radio. I asked her one day if she still had it because I wanted to clean and fix it up but it got thrown away. It was falling apart when I was attending class.

@debeshbhattarai 10 лет назад

Its quite amazing to note the kind of time you get to do these little things. It is almost the same for me too... I was inspired by your crystal radio and built one for me too, which is sitting in my drawing... kind of worried about the sound intensity, may be the time has changed as we get to have 100 fold more SOUND from the time.... I did one some 30 years back. Shall post a video of my crystal soon and any advice for me if I have to increase the sound intensity without an amplifier..... Cheers...!

@RimstarOrg 10 лет назад

One way to increase the sound intensity is to use a longer antenna and/or to make the antenna point in the direction of the radio station. If you're using an antenna coil and a tuning coil like I am, moving them closer together will also increase the sound intensity but at a risk of more interference from other radio stations. I'm glad you're having fun too! Cheers!

@2coryman 8 лет назад

way above my head to understand as I never learned much about electricity, though I enjoy best quality speakers that I can afford, which is not much anyway

@joshuasoanes1938 11 лет назад

Nasa launched a video demonstrating different types of ways robots can travel through planets and one of them is a bladder that expands when electricity is applied I'm guessing that it works by a specific gas being stimulated by a certain wavelength of electricity and the atoms in the gas magneticly repel eachother

@vowlesmc 5 лет назад

Great video! Does anyone know the optimum shape for the crystal to vibrate and produce sound?

@bruce_daddy 2 года назад

Tuning fork Y shape possibly.. I remember a video stating that quartz in that shape was used to keep time in watches and they've always seemed reliable. Even though the time keeping part is due to a specific frequency quartz produces by cutting it small and precise so that it's accurate. But tunings forks in general seem like they do the job considering it's basically a single piece of solid metal. I'm not sure how precise of a shape you're able to make but consider everyday acoustic items that are meant to be loud like a hollow cylinder used for chimes, bells, cones etc. Then again I'm not sure if its resonance relates to producing a piezoelectric reaction. If that's what you're using it for I'm pretty sure symmetrical shapes play a part in how effective that is.

@evilpotato112 11 лет назад

So if I understand correctly, you are using the piezos to turn electricity into kinetic energy in this video?

@RimstarOrg 11 лет назад

Of course. Could you be more specific about what you mean.

@MrMaverickstar 12 лет назад

rip put a LED on the transducer then slitly bend it, you will find it lights the LED what would happon if you had lots of these on sticks blowing back and forth in the wind bending the trasducer???? lots of LEDS lighting up.-)

@jeanious2009 10 лет назад

I had sound (barely audible around 75dB) coming out of my 300watt resistors when I was testing vehicle amplifiers for their output power.....with music you could actually hear around 200hz-2khz, just guessing. This was before I had them mounted (they where laying on my bench table with no brackets) now that have them properly mounted they are not audible at all.

@adriangiles5086 7 месяцев назад

It's possible that the magnetic fields associated with the high currents passing thru your wires was pushing against the Earths weak magnetic field and creating a version of the traditional magnetic "coil" speaker. It's a guess based on the info given and I haven't any experiential knowledge of this effect. If you can add any more details about the high power resistors or other observations of this effect I'd certainly want to work out what is going on as presently its an observation requiring an explanation. There are YT vids of people finding Rodin coils (a particularly fancy coil arrangement) behave a bit like quiet speakers, well it's really no surprise as one expects this at some level which of course is also quantifiable given enough info. Another thought its possible that the resistors you mentioned are of a wirewound construction thus having more inductance than any other circuit element such as the connecting wires and again behaving like speaker coils in the Earths field. This hypothesis would receive support if the observed sound increased in volume as you moved a strong magnet near and about one of the resistors. It might be that the mounting technique and orientation reduced the volume to inaudible levels but you might find that a paper cone with a needle or thin nail near its apex (point) touching an unmounted power resistor will make it appear louder. In any case I doubt it is a piezoelectric effect as displayed by quartz and Rochelle salt and certain other crystals. Just FYI I recall also that MIT reported a year or so ago some polymer they'd made which was effectively a piezo plastic sheet which could turn any surface into a speaker of sorts. It might be something you come across down the track.

@TheSalto66 11 лет назад

Hi RimstarOrg I have coils, variable capacitor, diode, but I don't have earpieces of correct type. I can put the signal directly in the microphone input of computer card? Thanks

@tehcno007 11 лет назад

does the coil that have more turns give out more voltage or more current...do we have to provide more current or more voltage to the peizo?i always get confused about these...

@johanengqvist544 10 лет назад

I just opened about 20 old smoke detectors to get the americium 241 out of them, and they all had those small discs inside them!

@RimstarOrg 10 лет назад

Nice! You can do a lot of interesting projects with that many! Sadly, back when I collected my 5 americium pellets I didn't know to keep the piezo disks. Have fun!

@EntropicCheese 12 лет назад

Could i use a smaller crystal and use a much smaller can, like something an inch in diameter?

@Mruiz0085 4 года назад

Thank you for teaching Macgyver everything he knows

@elielalvarado5546 3 года назад

Is there a way i can spand inductance over so frecuencies can heal my body

@itizme8072 2 года назад

@4:30, I'm gonna pretend that's a ground. lol. Let's all pretend this is a RU-vid video.

@robertopaula9515 9 лет назад

excuse me I dont speak english, but I understand what you do. It is wonderfull, You made a buzzer with a a piece quartz cristal. Congratulation, You are genius. Thank for help me. I need ten buzzers.

@RimstarOrg 9 лет назад

Roberto Paula It was a Rochelle salt crystal, not a quartz crystal. But a quartz crystal should work too.

@gamerpaddy 10 лет назад

i would use small transformer from powersupply.. not such big ass MOT with 1kW... next time try it with a flyback from old TV

@felixokeefe 11 лет назад

Not surprising that the radio alarm clock doesn't work any more. Putting the output of its amplifier through such a low impedance transformer is almost as bad a shorting it out completely.

@IronPearlCHI 11 лет назад

Omg you just gave me an idea for an invetion.first you need to look at a video on orgonite then look at video on orgonite with a mobius coil once you have done that go to google images then type orgonite kirlian picture pyramid mobious coil,what you should see is a prymaid pumping out pizoelectric into the sky now it looks like a dna strand.my question is if i was to plug a mobius coil to the speakers and a crystal in the middle then what would i need to add to stop it from shortening out.thanks

@jozefbania 4 года назад

My wrongly isolated logitech speakers plays louder ( when not conected to anything ) but well random stations in the random moment ;)

@7EsoTeriC7 11 лет назад

Thanks for the reply. Is there any way to make something that could produce a spark with an external power source? Or could using the rochelle salts with a capacitor ramp it up enough? Just curious for a potential prep item. Anything home made that could create a spark that's reasonably small and easy to make.

@InTheMirrorr 12 лет назад

Great job! From where did you get the white crystal? is it salt or what? please elaborate

@sanchithira1668 11 лет назад

Can anybody tell me how to store that electricity to continuously light a LED?

@DigGil3 11 лет назад

Wouldn't it work with transistors?

@RimstarOrg 11 лет назад

The piezoelectric materials used are crystals, i.e. their molecules are arranged in an ordered 3D pattern. That includes the chunk of Rochelle salt piezoelectric crystal I used for most of the video but also all the other commercially make piezoelectric crystals I showed.

@tostadamagica 11 лет назад

Hi my name is Paul, I wanted to ask you something about what shows in this video. The question would QUARTZ vibrations can be altered in ways that are different to affect the physical properties of another object. just imagine what the oscillation may be about to push like the other body. If the number of pulses to rock quartz 64 nano would pulses and frequency regulated at random would be could have that kind of result.

@RimstarOrg 12 лет назад

You can use a smaller crystal. See my other video "Piezoelectric speaker - small crystals/window as speaker" where I do just that. There's a link to in in the description below this video or you can find it on my channel page. Regarding the smaller can, yes you can use something much smaller. The paper cones I showed in this video were smaller for example. The sounds quality with cans doesn't seem too good so the quality with a small can will probably be as bad as with the big one I showed.

@kennedy67951 2 года назад

Was your Crystal made using (ALUM) = (POTASSIUM ALUMINUM SULFATE) or (EPSOM SALT) = (MAGNESIUM SULFATE) ? Thanks for sharing your knowledge with me. I do appreciate this very much.

@RimstarOrg 2 года назад

Neither. My crystal is a Rochelle salt crystal. I show the details of making it here on my website rimstar.org/materials/piezo/how_to_make_rochelle_salt_piezoelectric_crystal.htm

@wickedprotos1937 10 лет назад

Very cool!

@sbcinema 2 года назад

interesting video, but you should mention that microwave transformers can be quite dangerous

@7EsoTeriC7 11 лет назад

Can you make sparks from the rochell salts by them self?

@Vyclops 8 лет назад

1:07 i have that used for my fire alarm system i have

@Sebastian-eo7xh 5 лет назад

The transformer won´t work on a usual loudspeaker, because it transforms the voltage only, but not the power!

@ElectricUniverseEyes 5 лет назад

Awesome!

@cheazee27 Год назад

I FORGOT ALL ABOUT THIS GUY WOAH

@davidprock904 7 лет назад

can you please try this. take a good volume of your crystals and melt them into a cylinder shape and once cooled down see if it keeps its piezoelectric effect?

@RimstarOrg 7 лет назад

I don't have enough of the crystals that have the piezoelectric effect to melt into a cylinder shape. That cream or tartar is very expensive to be making a lot of them with.

@coondogtheman 2 года назад

What would happen if you took the output that is going into the piezo can speaker and hook it to a regular speaker through the microwave transformer.

@RimstarOrg 2 года назад

You wouldn't even need the transformer. The wires from the radio were originally going to a regular speaker inside the radio. So you'd just connect it the wires to a speaker.

@coondogtheman 2 года назад

@@RimstarOrg Yeah but does the microwave transformer make the signal more powerful like in a commercial 70v audio setup where the audio goes through two transformers before it reaches the speaker? One after the amplifier and one before the speaker. What would happen if you connected a high power speaker to the 70v line? I know that you can connect any speaker to the radio and it will work because I've tried it and you can feed the audio into a more powerful amplifier to make it louder. This setup seems like you are making the audio signal from the radio more powerful in order to drive the piezo speaker.

@RimstarOrg 2 года назад

The purpose of the transformer was to step up the voltage because the piezo crystal works off higher voltage than a speaker. But the current is lowered at the same time for the power stays the same (ignoring losses through the transformer). The only amplification may have been the use of cones to more direct the sound waves to a smaller location.

@Shanjaq 10 лет назад

are there any electrical contact angles that would improve amplitude seen at the mechanical contact angle of the crystal? what if you were to cut the crystal with a moistened thread and try the various angles?

@RimstarOrg 10 лет назад

There are definitely different orientations that work and others that don't. I find that with these Rochelle salt crystals the voltage is always at right angles to the pressure, but you still have to find which sides of the crystal to apply the pressure to.

@visiontechniques8702 Год назад

Could someone please make one out of a 55 gallon drum and a large crystal make the video for us all thanks

@RimstarOrg 11 лет назад

LOL Ah, thanks for clarifying! I agree. When a microwave oven transformer is hooked up directly to household power it's a high voltage AND high current scary thing. People make spot welders with it. See my good friend's Grant Thompson's awesome video doing just that ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vrlvqib94xQ.html