DIY Ultrasonic Audio Laser (Directional Speaker)

[@jtjames79]

I'm making one of these for my Curse of Strahd D&D game, so I can literally make players hear voices in their heads.

[@AlexanderTheMiddle]

Wow! Did you succeed? Can I please see the result?

[@chupacabraattack]

That’s an awesome idea

[@melissamosby9237]

It’s harassment

[@AndroidFerret]

Did it work?

[@jtjames79]

@@AndroidFerret yes and no. Yes it works, but the coof canceled the game.

[@Tony-nb6vt]

They really need to implement this on phones, this would be a practical use, so only the user can hear the audio and not disturbing those around them

[@manuelmozzali-ie2xe]

The quality will be worst than mono speakers from Chinese FM radio you get for free inside packets of chips as surprise. I don't want that in my phone in 2024, it has Bluetooth xD get earphones

[@PinkeySuavo]

earphones have entered the chat

[@Adam0Null]

But earphones can cause ear infections, and nobody wants that exceptionally someone who uses them 24/7 !!

[@PinkeySuavo]

@@Adam0Null everything can cause ear infections,just clean them. I used them for many months and years and I didnt have any infection. My first infection was after diving few meters deep in the water.

[@Dr.Tinkerpaw]

There is a vast swath of population that has absolutely no consideration or awareness for the people around them that don't or won't use headphones.

[@johnioannou3518]

As a Electronics Engineer I have built many circuits in the past but this is the first time I have a built a ultrasonic Audio laser. I had a bit of trouble to get it to work using the Mic4427 driver chip so I used the L293DNE driver chip instead which has a much higher working voltage of 36v compared to 18v of the MIC4427 and the circuit works fine now I also replaced the preamplifier chip with the TL082 which is capable of operating of a split rail voltage supply. In the future I might use the raspberry pi pico which run at 100Mhz to upgrade the power and sound quality of the Ultrasonic audio laser further.

[@MeanGeneHacks]

Nice to hear you made some upgrades and its working!

[@CaptainKandi]

Hi John, I'm making one of these for a university project and I decided to take your advice here and use a raspberry pi pico microcontroller! I'm very new to electronics and coding so I'm having a bit of a problem. With the .cpp file you get from github do I need to change the #include directories from 'arduino' and 'stm35 etc' to a header for the pi pico instead? Any help would be appreciated greatly! Thanks, Luke

[@kawrx2002]

@@CaptainKandi You might have resolved the issue by now or moved on if it’s a project. But you would need to use pico-specific DMA and ADC libraries, as I doubt the functions / arguments are portable.

[@ted_van_loon]

@@nander1988 hi, ik heb zelf geen raspberry pi zero momenteel, mogelijk in de toekomst wel maar momenteel niet. de suggestie die ik daar maakte was voornamelijk om een goedkope en makkelijk reproduceerbare versie hiervoor te maken met makkelijk verkrijgbare onderdelen. maar heb er zelf geen raspberry pi zero. echter had ik voor mijn eigen versie gekozen voor dedicated hardware. op die manier hoef ik niet allemaal dingen te programeren en dat scheelt werk. ik gebruik een simpele oscillator 555 met een versterker en wat andere dingen. echter terwijl het geluid wel duidelijker hoorbaar was in een rechte lijn kon je het daarbuiten ook nog horen in deze versie dus die was niet goed genoeg, anderen hebben het ook met vergelijkbare chips gemaakt dus er zijn tekeningen van vergelijkbaare systemen. echter voor testen omdat die versie niet goed genoeg was had ik besloten on direct de audio kaart van een computer te gebruiken voor het audio signaal en dat je dan weer alleen een versterker nodig hebt. is niet de beste oplossing maar wou het testen zonder te programeren omdat ik niet zeker weet welke vorm van modulatie er bedoeld wordt en wil niet een hoop code schrijven voor de verkeerde modulatie. deze manier werkt trouwens ook direct op een raspberry pi zero zonder programeren zolang je linux er op hebt staan. om dit te doen heb ik gewoon audacity gebruikt, dt audiobewerkingsprogramma heeft namelijk een functie ingebouw om audio te moduleren. zet de bitrate omhoog, moduleer het en je kan de bitrate dan weer iets omlaag zetten om ruimte te besparen of omhoog houden. er zijn bepaalde bitrates waarop het beter werkt, helaas heeft audacty geen standaard bitrate die een directe meervoudiging van 40khz is of 40khz dus kun je bereken welke je gebruikt of probeer een aantal settings tot je er een vindt die niet te veel distortie heeft en gebruik die. om het te convertion in audacity heb je audiotrack(als een mono track of omzetten naar mono), ga dan naar tool nyquist prompt en gebruik het volgende commando: ;version 4 (if (and (soundp *track*)(= *sound-srate* 384000)) (osc-pulse 40000 *track*) "Error.\ Input must be a mono track\ with 3,840,000 Hz sample rate.") zorg dat de track met track->resample omgezet is naar belke bitrate je gebruikt. deze pat 3840000hz maar er zijn betere en er zijn ook manieren om custom sample rates te gebruiken als het goed is, met een custom sample rate kun je ruimte besparen en veel betere qualiteit hebben. voor deze heb ik echter gewoon een standaar samplerate gebruikt je hoort dat wel maar voor testen kan het goed/handig zijn. met een pi zero zou t wel effectiever zijn om gewoon de audio af te spelen direct of de modulatie zonder software maar ben er nog niet echt verder in gegaan omdat ik onderdelen voor een ander project binnen kreeg en daar mee verder ging.

[@mbproducoes]

Hello John, I had some success building the original project from @meangenehacks, but I would like to see how your project improves compared with the original. Would mind share your schematics? Thanks a lot.

[@spunbearing65]

I need one. I got a neighbor who is obsessed with leaf collection to the point he runs his leaf collection trailer on his rider mower (wannabe parking lot sweeper) at full throttle with no muffler all day. I’m certain that he will hate a recording of it directed at his bedroom at 3AM. Gimme.

[@mrstephenpariah]

My neighbour pumps heavy LF electromechanical vibrations throughout my home night and day.

[@gigglehurtz3167]

@@mrstephenpariah im specifically here because i got redneck neighbors who think they live on 100acres with no neighbors as they off road with loud trucks at 12 am and WOO HOO all night...

[@notthesamagain]

I thought this could be done by people without previous electric/mechanics knowledge and that would have a hands on step by step after the explanation. Still congratulations, I'll keep searching for a "DIY audio laser for dummies".

[@MisterKaen]

I have some crackheads across the street that keep me up more times than not. I am absolutely going to use this. Didn't coca cola pay to have this developed because they wanted people to hear a glass of coke being poured when they walked past a vending machine

[@MisterKaen]

@@Mo-uk7pv i never did but now i just decided to file an abatement. I had one of the crack dealers show me his gun just 2 days ago. Im over it. Abatement clear that nuisance out.

[@elnillu9056]

Everything good now?

[@allenhuffman]

Thanks for this. I’ve been checking in on directional sound every few years and this looks like something I’ll try to build.

[@nate2894]

now convince your family there is a ghost in the house

[@thewhitefalcon8539]

I did that by putting a rpi and a speaker underneath a family member's bed

[@wizardOfRobots]

Dude...this is very cool.... I got this idea and tried implementing it. Didn't get very far. I thought it could be made like a personal "wireless" earphones device. Like you could be sitting in class pretending to listen to your prof, but actually be listening to songs or whatever. Great job anyway.

[@guru332]

Since the audio is highly directionality, you could have two way communications between two people at opposite ends of a class with nobody else would hear or know. Or you could use it to just troll the teacher and make them think they are hearing voices 😀

[@MeanGeneHacks]

I was at 33C3 in Hamburg, Germany, where I first saw this type of device in use. As people went up an escalator to the 2nd level, they would hear appear music out of nowhere. The music was being beamed to the people on the escalator from about 40 ft away.

[@wizardOfRobots]

@@guru332 Way to troll them

[@keithfulkerson]

If you played a mosquito buzzing sound through it, you could make people flail at your command.

[@mijnsmt8198]

You can also generate a PWM-modulated signal by feeding the audio and a 40-kHz sawtooth to a comparator like the LM358

[@Tkillaahh]

That's freaking cool. I bet i could prank people so funny with that. Great work!

[@bsrcat1]

These work excellent if you have a really messed up neighbor.

[@bschwand]

Really great project. Some comments: this MCU is plenty fast for high quality sounds, it just needs to be programmed right. Arduino is crap for performance. STM32 uC have tons of timer modes, it could be used much more efficiently. Also the ADC, your code uses DMA but for one sample... so the interrupt rate is high. Would be much better to use DMA ADC to fetch a few KB samples at a time, then compute the expected response PWM required in a buffer and use another timer to schedule appropriate output frequency changes at the correct rate. All I am saying is that the code is way sub-optimal and could show much more improvement before anything hardware needs tweaking.

[@erkamboyacioglu3515]

did u manage to change the code to fit your needs?

[@GGCannon]

I asked this question on a re-upload of your video on an account that stole your content but only got to find that it wasn't your real account today, so I wanted to leave this here. A question, if you use it to play 30 to 60Hz frequencies, can it be used to extinguish fires at long range? Frequencies between 30 to 60Hz are know to extinguish fire, but only at short range from the speaker. If long range direction acoustic speaker can be used to play that frequencies, could that not be used as a long range acoustic fire extinguisher? Someone commented that as long as it has enough amplitude, it should work. So, in theory, doesn't it mean you could make a long range fire extinguishing sound cannon as both a product or equipable extention to fire-fighting drones as long as the amplitude on that is enough? Sounds like a good thing to check if it's possible and if it is, what's the maximum distance it could work.

[@harrisonschwartz565]

Gene, you should try to make a standing wave levitation device using this. You’ll get many views 😂

[@kibi6563]

What does a standing wave levitation device do

[@dhebert111]

Really great video. Thanks for sharing. I'm just trying to increase my knowledge base in electronics. I'd like to be able to build various electronic devices to use around the house and garage. I can't get over how inexpensive electronics parts are. The electricity part of it was easier for me because, believe it or not, there's alot of parallels to pipe-fitting and hydronics, which was my trade. I'm subbing for sure bud. Thanks again.

[@themod169]

Thanks for the fun project. It was quite painful to find the proper stm32adc lib, but eventually it worked. Maybe I messed something up in the soldering, but the sound is quiet, directionality is somewhat present but it's more of a bad speaker with noisy audio than an audio laser. At 18volts tc4427 overheats really quickly, so I had to wind down it a bit to have at least several minutes of working time. Probably I'll look for different components and try building v2 when I have some spare time.

[@BeatMyth]

I had exactly the same problems. First to program the STM32 and once I managed to do that, it works but as you wrote "more of a bad speaker with noisy audio than an audio laser. At 18volts tc4427 overheats really quickly". I have managed to burn a few of tc4427. The weird thing is that he managed to make it work quite ok. Did you figured out any improvements or mistakes we made?

[@caseyfaller8394]

Where did you find the stm32adc lib? Thats what im stuck on

[@LuciusLu]

I am also looking for a stm32adc library that works for the stm32duino platform on the Arduino IDE. I found one by Roger from Australia, but something is missing. I am using blue pill stm32f103c. I'm stuck.

[@supermariosupermayhem]

How did you find STM32ADC.h ? Tried with one on arduino IDE but "compilation failed" with no additional reason.

[@lasseledet1899]

Cool project! Which STM32ADC library did you use (I am new to STM/Arduino - Sorry)

[@rodgerrodger6298]

Just spent a little over $20 to start this project. I got 20 transducers and some higher quality amplifiers, and ive already got a raspberry pi 3 which has a faster clock than the stm32f103. Im excited to get started on this project!

[@jonathannielsen8524]

Please tell how it went. Im waiting for my parts to arrive. Ill try to work with the new Raspberry pi Pico 2

[@byronedwards]

Please tell me how you got it to work with the raspberry pi 3

[@imagination704]

I have no experience making this stuff, anyway to make a how to tutorial?

[@MemesnShet]

Ultimate trolling potential,hook up a mic to it and you can make people hear voices on the street lol

[@RavenLuni]

Interesting. I imagine using a pure class D amplifier would eliminate any quantisation errors and improve the quality greatly. All you need is a sawtooth generator and a comparator to drive your output stage.

[@masyrafmasyraf8086]

Thanks. Now im gonna make a 50khz version and blast it at my neighbor's dog for barking non stop at 3am

[@mycosys]

You seem like a terrible person. Why torture something that is already clearly tortured. Why not show some humanity

[@mrchickenfugget2035]

Your such a loser nothing more to say

[@MoizCOUK]

I need to build something like this to scare a big colony of tree hanging bats

[@SpaceyInfinity]

Cool video, one question, what do you recommend for high disable or amps?

[@MaaveMaave]

Awesome. I'm going to make a laser+sound cat toy with this

[@MeanGeneHacks]

Have fun!

[@IBoughtItMyself]

This channel is one of KZbin‘s hidden gems. Your work is incredible. Although I hate you because you are good looking but also very smart in multiple areas.

[@vicandtjfriedmann7136]

How would you modify this design to turn it into a high frequency sicnal (20-30 khz) to be used as an anti-barking device for dogs and what distance range does it have? Thanks.

[@chrissullivan6030]

Thanks so much for this! Is this how they talk in our heads?? Must be more to it than this..

[@Kazperian]

Super interesting, but how do yo have all those spare parts laying around in your house? Did you dismantle the millenium falcon or something? Sounds like something Rey would salvage

[@realYYsky]

wow, this is really cool!!!!!! could u please give us a detialed tutorial on how to implement this? I'm just really not good at these.

[@jafinch78]

Any thoughts using a pulse train method as a third method? Like a digital method such as performed with LPCM wireless? Really awesome project and video. Thanks for sharing!

[@Totalrandomness2011]

Please do a demo for implementation option 2! 😊

[@fdc4productions54]

Wait, will this work to shut down the loud TV or Radio music speaker from my neighbors?

[@cyruss3813]

I have a question. Say you put your hand in front of the speaker. Will it sound like the sound is coming from your hand? I saw a video of a professor aiming the speaker at a wall and the students could hear the sound as it bounced off the walls. Just wondering how the speaker works.

[@prasadelumalai946]

Thats awesome man.. and you made it so cheap..! I am going to build one now 😁

[@dark_raven4491]

Sorry, old video, but can you block something like this? A friend of mine is being terrorised by a neighbour with one of these things, probably. The guy sends noise to her bedroom at night. Will simply blocking the window work? Thanks for the help.

[@jamledger5238]

How would you deflect this if you weren't aware of where it was coming from? or more sophisticated types that can go through walls?

[@siriperera6974]

Hi great introduction to electronics for everyone. Are there ultrasonic speakers on mobile phones? Do you know of any miniature ultrasound speakers for mobile phones?.

[@lichtundliebe999]

Thanks for sharing! How loud is the bass coming from these speakers?

[@clif_plays]

I’m thinking of running 2 9V batteries in series to supply the 18V to the driver circuit. Would you have any reasons to advise against this? & what would you recommend to supply power if I were to use a driver with a higher capacity?

[@WhatAWondWorld]

thanks

[@chasperette17]

Hey! I have little to no experience with electronics and i'm trying to build a parametric speaker like this one. I only know a bit of C and no C++ at all. Therefore, i'm considering using an Arduino controller instead of the STM32F103. Do y'all think it would be alright? Apart from this, would you say this is an easy project or a rather hard one?

[@jeremyuzan1169]

Bro you are a king. Keep on doing some awesome videos !!! Jeremy IRCAM Research Institute Paris

[@seanosorio3138]

An amazing peoject. I don't have any background in electronics. Could you post a video with a step by step puting toguether? Would really appreciate it

[@SnekPuppet4758]

I need one to play the fnaf golden freddy sound in my classmate's ear so they freak out and everyone thinks they're scitzophrenic.

[@selfhelp441]

what’s the difference between the preamplifier stage and amplifier phase which drives the transducers? (sorry if you already explained somewhere in the video, i’m mid watching it as i comment!)

[@sorryfornoname2157]

Hello. I was thinking on replicating this project with some modifications. What are your thoughts on the use of a Raspberry pico w instead of a STM32F103C8T6? Would that be an improvement or a downgrade? also what opamp would you recomend since you say there are better options? I have some IRLZ34N lying arround if those are any good. I would be thankfull for any help you can give since im still starting to learn about this kind of eletronics.

[@linn_da8924]

great video!! I would love to build it by myself. I already startet. I wonder which kind adapter do I need for the STM32ADC? I am new to this. Would be very thankfull about an answer:)

[@cxshoppermag3239]

Hi there thanks for this innovative idea 🥰 I have no way to use arduino 1.8 now can you please update th code or comment usage of timer1 and 3 I mean regarding configuration are you using channel 4 on TIM1 output compare(obsolete as per newer version) or just counting. thank you in advance.

[@rtravisboyd]

Now what would you charge to make an ultrasonic dog deterrent that was bark activated following this same design?

[@josephsoucy9543]

How far will this setup project the audible sound,,! or the range of it?

[@ramazanteke5819]

Dear Mean Gene,We are writing to you regarding the ultrasonic directional sound speaker design you developed. We are two students studying electrical and electronic engineering in Turkey. We reviewed your design and decided to do this project for our graduation project. We have performed the STM-32 boot process and set up the circuit as shown below. However, we are struggling to understand how to power the TC-4427 integrated circuit and have not been able to obtain any sound output from the circuit. Could you please provide us with detailed information on this matter? Additionally, could you share more information with us about the design of the circuit on the breadboard?

[@ehresmanr]

The apparent bass response is miserable, but I suspect this may be caused by the microphone used to listen to it. Is bass response better to the human ear? What can be done to improve it? I have heard professionally made "Sound Lasers" that have impeccable bass but I suspect these are implemented as the dual beam interference type.

[@kawrx2002]

I’m wondering that also. I built this project (perf board prototype and PCB), but used a TLC 272 for the pre amp. Just with experimentation, bass sounded a little better by using a higher value cap for C3. I know other parametric speakers use different modulation, and possibly different filtering. I can also say the bass response is better on my PCB board, where I have them placed closer together (and many more) than on the perf board.

[@willworknow]

Using a 555 timer with the control voltage pin, pin 5, for the modulation, an LDO (or something) and amp, will do this in 3 main components.

[@plasmar1]

I noticed that imminating sound effect with a ultrasonic measure I bought at thrift, made me think that there is potential that ultrasonic mouse deterrents might be a real thing just majority of the time probably implemented wrong as I've never heard one that sounds anything compared to it, and would imagine it would freak out any small critter

[@myyoutube6978]

My neighbors are imitating this with multiple sensor's around the Streets, you Walk into the path it activates causing headaches and sound bubbles around the ear like described off the technology that released technology that sends music to ones ears by one output. How do you block Immitating ones like this.

[@mentalunicorn9567]

I want one of these so bad

[@kailyngrave]

thank you Gene. This is so cool

[@tomm9176]

There are other sound focusing videos using noise cancelation by generating signals that are inaudible to the human ear. The 2 signals are not the the same and when the signals reach the focal point only the difference in the signals are amplified. The focal point could have unthinkable amplitude of power and no one would even be aware of it. Your design could be the delivery device.

[@ted_van_loon]

I just simulated it with the transducers at multiple different distances from each other and noticed that while it does kind of work with almost all distances it does seem to work much better and more directional when all speakers are at exactly half a wavelength from each other. since the transducers are to big for this(wavelength below 1cm) some other distances have to be used. did you use a calculation or simulation to determine your distances and if so what are the distances between them in 2 axis. or did you just place them however you felt like, if so adjusting the distance might increase the distance and directivity.

[@kawrx2002]

I think placing them as close as possible together is most effective. The transducers lose 6 dB of pressure at 30 degrees off center; and maximizing the pressure over distance takes advantage of all of the transducers feeding into a combined wave. For a perfect transmission you would need to individually control the timing of each transducer phase to “aim” at a specified distance.

[@strandedoncat]

@ted_van_loon What about using speakers w smaller diameters? The transducers in the video are 16 mm but also come in 12 and 10 mm.

[@ted_van_loon]

@@strandedoncat I actually used 16mm ones in my build since they are cheaper, this comment however was based on simulating it and was done before building, so that means essentially not measuring the diameter but instead using the exact center of the speaker as the point from which the soundwaves come, technically seen based on the transmitter it's optimal behaviour should be like that, which is why I used it in the simulation. however luckliy for us the imperfect behaviour of the transmitters automatically increases directivity.

[@AjinkyaMahajan]

it is similar to LRAD Well done ✌✨✨✨

[@diegojimenez2939]

Hi, could this be used as a ultra high frecuency gun? Could it play 20Khz sound to use as ultrasonic gun? I have a sleeping problem with a nearby nightclub and would like to use this for the drunks that come to pee and binchdrink to my door. Thank you

[@donadams7469]

so here is the big question what would I need and how would I do it say if I wanted something a little better audio quality

[@mbproducoes]

Hi. This project is great. Thanks for that. I had great fun trying to make it work. So I think I got there, but I have a coupe of questions for those to manage to make it work. Fist, how is the sound quality? I can here the sound coming from the transducers or from were I point them but its a pretty bad sound (remembers a broken speaker) it should be like this? The TC4427A is getting extremely hot, to the point I almost burnt my self. Is this normal? if so, should I use a heat dissipator? Also, in the schematics there is a LED the are not showed on the prototype of the video. The LED never turns on. Why is it there? Also about the schematics, the resistor R5 says only 10... it is 10 ohms right? I can hear sounds coming from the transducers array even if I'm pointing them to nothing, so I was thinking that I put them too close together, so, what would be a good distance between the transducer? And the last thing would be, if I want to make this sound better where should I focus on? STM32 or LM358 or TC4427? Thanks a lot and cheers on :)

[@erkamboyacioglu3515]

Hey would you mind taking some pictures of the circuit as I am having difficulty assembling it? It is for a school project.

[@mbproducoes]

Sure. I'll send you a link with the pictures. I had to redo the schematics on EasyEAD, because I want to do PCB for this project, so on the link you'll find pictures from my circuit and also the layout of the PCB and the new schematics. I hope this will help you. if you need any further assistance fell free to contact me again. Happy Project:) cheers on.

[@mbproducoes]

drive.google.com/drive/folders/1kJe_e6ppu0KtzUXkb3yIyJFNcY5Vv5xr?usp=share_link

[@erkamboyacioglu3515]

@@mbproducoes thank you so much

[@mbproducoes]

@@erkamboyacioglu3515 you are welcome. Let me know if you have success with it. ;)

[@lucascho2702]

Amazing, I wonder if it's possible to recreate this with PSOC

[@ax386]

Thanks for sharing. Is there a decible limit on the audible sound that the ultrasonic sound would be able to limit?

[@xxdogxx3637]

No

[@isaaclikins5383]

Would I be able to use an Arduino nano (ATmega168) micro controller for this project? I have some of those lying around. This tutorial is awesome. I am wanting to make this as an alarm clock for my dorm.

[@MeanGeneHacks]

Unfortunately, thats very unlikely. The Nano is an 8-bit MCU that runs at 16Mhz. For comparison, the MCU I used in the video is 32-bit running at 72Mhz. I don't think you would be able to process the incoming audio fast enough to output a modulated 40Khz wave on an Arudino Nano using the method & code from the video.

[@nowthenad3286]

I'd give it a go but the sound seems really poor quality. Does it sound in real life like it does in the video?

[@lleuwistatos9638]

hi, we are a group of 3 students using your video as a reference for a school project , is there any way for us to reach you other than the yt comments? otherwise great video!

[@MeanGeneHacks]

Yes, of course

[@brayanortega5518]

How will it work underwater? will underwater lives communicate like this?

[@anthonysmith1246]

not much consumer info is out there on these, I bought on on Ebay and I'm having some problems tuning it in a way only I can hear it. when the audio is clear I can hear it like a normal crappy speaker or with some tweeking it sounds good but never directional. any tips?

[@thetruthexperiment]

O! And! Would a pure sine wave have a narrow beam?

[@josiahpait5286]

Would it be possible to use this idea to create, instead of a beam of sound, a singular point of sound? That way something like a phone could use face tracking to project sound right to your ears? I’m thinking about maybe trying something like this for my senior engineering project

[@ceticx]

I have literally no experience in this, but I'd imagine you could get something like that working just with a directional beam pointed at the ears as long as its quiet enough. If its too loud the demodulated audio would bounce off your head and maybe allow other people to hear it, but quiet enough and maybe it'd only be audible in a small area around your ears, although it's not something I'd trust for privacy like headphones with this approach. Something work testing out lmk if you try anything

[@adhuot01]

I'm currently working on this project but using an ESP32. I'm hung up on the complementary output. Can I not just output a second PWM to another pin? But for this pin, I would swap the last two arguments in the map() function for duty cycle which would invert the PWM output. First pin duty cycle: map(soundInput, 0, 4095, 0, overflow);. Second pin duty cycle: map(soundInput, 0, 4095, overflow, 0);. Or something like that.

[@RobR386]

Thinking about this idea so I can play music at a decent volume without annoying my neighbours, needs to be CD quality audio

[@luv2learnify]

Hi, my son would like to make this for a school project, but some of the links no longer have the item. I have no idea on this stuff could you point me in the right direction to find al these parts, please.

[@leonroscoe2864]

Hi, how did you build the array? What are they plugged into and how are they welded? thank you

[@Debora-m8r]

Can you create a circuit that converts the ultrasound into regular audio? I have five to seven directional speakers aimed at my house that are used as part of an online broadcast in extortion racket. In addition they use surveillance equipment illegally installed in my house to sim the directional speakers. An antenna system with an ultrasound and frequency analyzer costs in the $100,000’ so a simple detector system with audio speaker out would be helpful to record.

[@silverlightsabr]

similar situation - have you found a solution to get rid of them?

[@Anthony-vb7sj]

Fantastic work 👌🏼👌🏼👌🏼

[@GarrettBShaw]

Dragonborn: Zulmeygut Us: directional ultrasonic speaker

[@salmantechnologies282]

very talented nice work

[@bilbobaggins4076]

do you make them for people privately ?

[@vincentc6788]

Can you show how to make a circuit for a transducer transmitter and a transducer receiver as two different pices

[@gastonmazzei8087]

Hello guys. I'm confused. Of course we can make it ourselves, but my question is that I have bought one from a chinese supplier at 150 USD with a very good termination and features (e.g. remote control, audio plug input). They have failed to make it drastically directional, i.e. on the front the sound is loud but on the sides it's still audible at a similar (but clearly lower) volume. From it it can be clearly seen that it's composed of several small speakers, we can guess they are ultrasonic. The question is how can they have failed to make it 100% directional, why is it spreading (i.e. a cone instead of a "laser" propagation patter). so much at pathetic distances such as e.g. 50cm. I guess this is not fixable, I will do one myself. In any case, I am genuinely curious about how can their implementation fail so drastically. If the manufacturer answers me I will update this comment. My only idea is that their "audio input" is not intended to receive normal audible sound (i.e. 20Hz-20KHz) as one would expect from such a high-level system but it's 40Khz modulated version. Thank you all.

[@MeanGeneHacks]

The cone shape is most likely due to lower quality (or frequency) transducers being used that have a wider beam pattern.

[@FuzzBreez]

is it possible to use only 1 ultrasonic transmitter and would it be possible to make it smaller so you can easy carry it in the pocket?

[@MeanGeneHacks]

In theory, yes. I'm not sure what type of sound output you can expect from a single transducer. More than likely, at the current voltage that the driver in my circuit is set at, you may not hear much with a single transducer. You can explore replacing the driver with one that can handle higher voltages and see if you can get it working with a single transducer.

[@gardenoir6176]

What Microcontroller would you recommend for better sound quality? How close to 16 bits do you believe you can get before it gets prohibitively expensive. Thank you so much for this!

[@MeanGeneHacks]

Try any one of the STM32 high performance series. They would give you a significant boost in sample rate (audio quality): www.st.com/en/microcontrollers-microprocessors/stm32-high-performance-mcus.html Or if you are on a budget, a good replacement would be the STM32F411CeU6. They are under $5 and are faster than the MCU I used.

[@rajeshnaik2391]

I take my dog for walking in the morning... Can i use this to keep stray dogs away from my dog...? Does it work?

[@matthewlapos3541]

Do you sell these? I would love to purchase one because I do not have the know-how to make one myself.

[@bluepriushere]

It's possible to make an analog version.

[@gdgd5194]

what happens when you put this directly to a concrete wall? Can you hear it behind it or it reflects back?

[@skydyverjym]

It gets blocked. Even a piece of paper can easily block it

[@VacuousCat]

I want to try using this as a human echolocation tool.

[@riseout]

Can you disable neighbor's speakers with this one?

[@CaptainKandi]

Attempting to make one of these now! could you explain how the transmitters are connected?

[@matthewboga]

Im trying to figure this out right now as well, did you ever find out how they are connected?

[@azinfidel6461]

I was curious, when you're pointing the device at yourself, do you perceive the sound coming from the device itself or from elsewhere?

[@MeanGeneHacks]

It reflects very much like a laser beam. If I point it directly at myself, it sounds like its coming from the device. If I bounce it off an object (ie. wall), it sounds like its coming from the wall.

[@azinfidel6461]

@@MeanGeneHacks Ty

[@imagination704]

What would the best part list be for this project be?

[@MeanGeneHacks]

You can just use the parts I listed in the video if you want something that works. I haven't tried making a better version yet; however, I do give some clues/ideas as to what components you can swap out for better versions.

[@niranjanjagdale1456]

@@MeanGeneHacks How can I contact you?

[@objectionoverruled4697]

How far can these transmit sound for 20metres? 100 metres?

[@realcygnus]

Nifty AF !

[@dagodlygames9228]

Is there a way to make the audio better?