Simplest, cheapest, effective DIY ARDUINO ultrasonic Microphone Jammer / DIY ultrasound Audio Jammer
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- เผยแพร่เมื่อ 26 มิ.ย. 2024
- [ENABLE CAPTIONS!] In this video I am showing how to build ultra cheap ultrasound Dictaphone / Microphone jammer to protect your privacy against unauthorized recording or eavesdropping during business meetings etc... Whole device costs less than 30 USD and is very simple. Please notice that commercial solutions giving the same jamming results cost 10-50 times higher and I am giving you this solution for free. So plz reward me with a LIKE at least :-)
The ultrasound audio jammer / audio recording blocker - is composed of :
- Arduino DIGISPARK ATTINY85 based unit or Arduino Pro / Nano / Mini etc - both versions of solution available (6 USD),
- Audio power amplification module PAM8403 (1 USD),
- Signal Generator board AD9833 ( 3 USD )
- set of 10-20 ultrasound transducers for 25kHz ( 10 units cost 10 USD).
If constructed properly the jamming range is up to 10 meters (conference rooms) in closed areas for most low end chineese surveillance devices. PAM8403 module gives 6 Watt of audio output power on 25kHz but it can be replaced with any other like PAM8610 for 2x10Watt output. No additional programmers are needed ( ARDUINO DIGISPARK is programmed over USB from Arduino framework on Windows/Linux/Mac)
Whole project data can be found here : github.com/mcore1976/antispy-...
DIGISPARK version
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ARDUINO Nano/Mini/Pro version
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The ARDUINO with AD8933 generates pulse wave with 25kHZ center frequency which is randomly changed within +/- 2kHz area to achieve white noise. This white noise leaks to hearable frequencies 100-5000Hz and overloads hidden microphones. You may hear this noise in my video..
Please notice that there are some hi-fi microphones that may not be jammed with this device - especially these with several microphones and software echo cancellation. There is never 100% effectiveness but this device may suppress huge range of recording devices (voice assistants, dictaphones, wiretaps, audio recorders, cell phones, tablets, laptops, hidden cameras, gsm bugs, laser microphones, direction microphones etc.) In the video I am showing how the device works for two different phones in the video - cheap and expensive one - you may compare its efficiency.
If you are businessman or politician conducting some negotiations this kind of device is must have for you to protect your privacy by protecting your private conversation and secure your business.
If you like this project press the LIKE button and SUBSCRIBE my channel.
Thank you very much !
#ALCHNL #ARDUINO #ATTINY
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I very much respect your work. Well done. In looking through the comments I see a lot of ppl who’d like to purchase one. I know the delivery cost is an issue but there sure seems to be a market for it. Anyway, thanks and good luck from the US.
thank you very much, I am trying to build it for my work.
thank you for your effort and sharing the knowledge
Sounds cool
Nice work👍👊
Thanks for this. I was thinking a few weeks back about using an AD8933 for this, as I have used it before for other applications (see the signal gen on my YT page) I wonder if the transducer method would jam laser mics? Would be an interesting experiment. Good job and thanks!
The best
Excelent !!!!
Thank you very much, I have no idea about electronics, with the instructions it was also possible for a beginner. I have one more question, you explain that it would be possible to send music faster with another Arduino instead of rushing, could you explain it in more detail, maybe for replicating. An ultrasonic speaker is expensive. Thanks in advance
Thank u ★
It's very good.
I made a mic jammer referring to your previous video.
By the way, can't any kind of jammer lower the ultrasonic noise that is generated minutely?
this one can. you have to switch modulation to sinusoidal and use potentiometer between AD9833 generator output and PAM8403 input
I tested option 1, I found that there was an improvement in interference and sound changes in the result of recording audio on some cell phones, but it is still ineffective on the iphone.
i'm going to try option 2 today, i think iphone has very good noise filters
option 2 is almost the same as option one. The difference is that Arduino IDE has probably better random number generator which is a base for the white noise frequency
I rebuilt it, works fine with 20T but not on modern phones (especially iPhones) as you mentioned it. Would more power make it more effective? Or would it be more effective if I increase the amount of transducers? Any advice on what I could try, which Hardware I could buy, etc.? Thank you very much btw. I really love your content, I have learned lots of stuff from you!
yes, please use PAM8610 and 2x40 transducers for better effect. Remember that this PAM version needs to be powered from higher voltage than AD9833 & Arduino. You will need also voltage converter for these boards
You may also try to build two jammers and switch them on at the same moment for better efficiency
@@justanengineer5599 I will just go to aliexpress and order it. :) So basically I can use the same code but I should replace the PAM8403 with an PAM8610 (with potentiometer) and just play around with the waveform maybe? I will take care of the voltage btw I'll find a 12v source.. :)
@@justanengineer5599 Another thought, do you think PW3825 ultrsonic speaker could work? 2,5-50kHz is the range it supports ?
yes, you may play around with the waveform type. The type of amplifier is irrelevant for the source code as long as it has an analog potentiometer. You may try it with this speaker however piezzo transducers are more energy efficient devices
Could you please make a video setting up the pro/micro/nano configuration? I am unable to get it to work using your diagram. The code uploads fine (I’ve tried nano and micro), and everything is breadboarded as you have it. I have even lined up the polarity of the transducers. I have used many different PAMs, two different 9833s, and multiple microcontrollers with no success. I promise I’m not an idiot. Is there a major consideration I’m missing? All devices are going to the same ground and to the same voltage source at 5v. I have mostly tried building this with a nano. Thank you!
I will do but it will take some time. meanwhile you may try to solder boards together because using breadboard may causs some connection losses
Excuse my lack of knowledge, but at the output of any PAM840x the outputs are direct current, when connecting the transformer coil wouldn't I be closing a short on them since to move the transformer coil it would be necessary alternating current at the output?
the winding of transformer always has some inductance like ordinary speaker for example. If the winding has 4Ohm like the speaker it would fit the PAM840x output
there is some explanation here electronics.stackexchange.com/questions/95743/can-you-bridge-or-parallel-the-outputs-of-the-pam8403-amplifier
also here
www.diyaudio.com/community/threads/increasing-power-of-pam8403-3w-3w-amplifier-board.268899/
Hi, what app do you use to see the spectre? Is there a way to know it is working? Thanks
the app is Spectroid
Hi,
The transducer 25khz
Have 2 types: transmitter and receiver. I guess you have to buy only the type of transmitter, right?
actually there is no difference between transmitter and receiver. There are exactly same built except marking R or T
Hi, you said that to increase the range you can use a pam8610 amplifier, the problem is that it needs 12v and the generator and the microcontroller work on 5v, how do you solve the problem?
step down dc converter 12v-5v is needed. Then you would power whole device from 12V and 5V from the converter will be used to power Arduino + AD9833. You could have it installed inside your car to have possibilty to perform "secure talks" inside your car
Looks very nice ! But i have an issue . I cant compile the code on the arduino ide , it says : USICR was not declared in this scope
I tried the previous one without ad9833 ans it works . But the code attached in this description doesnt work . Can you help please ?
I pressume you are using Digispark, right? For this device you need to have all Digistump libraries attached to Arduino, you also need to use latest Arduino IDE. The other thing is the source code which has to be raw.githubusercontent.com/mcore1976/antispy-jammer/main/mic-jammer-ad9833-digispark.ino
Hello, what should I do to increase the distance? For 2 meters distance.
better PAM module should be used and definitely more transducers like 40 or more. You may use PAM8610
I'm trying to make some code changes but with no success yet, the iphone can easily ignore the noise and not be affected. if you have any progress or suggestions for testing with iphone that you can share and post here for us to test thanks
Hi try my main7.c code for the design with resistor DAC ladder (the one without AD9833). I am currently working to improve and the results are promissing
If I only use transducers on a single output of the amplifier, the interference in common devices is less and in the iphone there is no interference.
If I use transducers on the two outputs of the amplifier, the interference is total in common devices, it only interferes with the iphone if I get very close to the transducers, about 5CM of proximity, when it passes more than that, it stops interfering.
with speaker and transducers, it interferes well in common devices, at a short distance (1 meter), in the iphone it only interferes if you are also 5cm away from the iphone it only records the noise generated together with the voice having a result (it can if you listen to the being said with noise generated by the speaker in the background).
OBS: the oscillation is correct apparently all the circuit and recording of the atinny was correct, I watched videos of similar devices, with transducers and loudspeaker and in the videos they work correctly on the iphone however the sound emitted by the loudspeaker seems more like radio hiss outside the station, because this signal generated in your code, the noise seems very different from hiss and is audible to the point of being annoying if it is above half the potentiometer adjustment.
yes, it looks like it is not durable without randomly controlled audio gain with digital potentiometer on top of the noise generated by AD9833 signal generator. I need to redesign the circuit using digital potentiometer and AD9833 generator
How many emitters can be connected to this one? 16 pieces will work fine?
yes. up to 10 transducers per single channel can be connected to PAM8403. But pls wait for my new video that will be available tomorrow. I am using TPA3116 module there which allows to connect up to 40 per channel : th-cam.com/video/8RgoYlrgW4s/w-d-xo.html
Czy PAM8610 musi być z potencjometrem? Czy można kupić bez. Rozumiem jak wzmacniacz będzie mocniejszy to zasięg i efektywność zagłuszacza zostaną zwiększone? Jeżeli PAM8610 ustawie na max mocy to nie będzie przesterów na przetwornikach? W opisie PAM8610 jest iż działa w zakresach 20hz-15khz
to zalezy czy chcesz miec sinusoidalny sygnał (potrzebny potencjometr aby nie przesterowac wejscia wzmacniacza PAM) czy chcesz miec prostokatny sygnał na wejsciu przetworników ultradzwiekowych. Od razu mówię, że sygnał prostokątny ma więcej harmonicznych i może być lekko słyszalny
Hi
If you could with a simple yes or no, tell me if these transduces will fit, that would help me.
I can't send the links because youtube blocks them... so I copy and paste the title of the article and its characteristics written on aliexpress
Thanks
16MM probe, ultrasonic sensor, transceiver, 25KHz ( in french : Sonde de 16MM, capteur ultrasonique, émetteur-récepteur, émetteur-récepteur, 25KHz )
Product performance:
1 nominal frequency (KHz): 25KHz
2 transmit sound pressure at10V (0dB = 0.02mPa) 115dB at 25KHz
3 receiver sensitivity at40KHz (0dB = V / ubar): -68dB
4 capacity at1KHz,
yes these will work just fine. both R25 and T25 are ok. Transmitter is also receiver when talking about transducers
I turned on the transducers and the speaker, on common and older devices it worked at a distance, but on the iPhone (8 plus) it works if it is up to 5cm away, moving further than that it only records the noise emitted by the speaker (very loud and uncomfortable for the ears of those in the room), and I can hear the voice normally.
I recorded it with my iphone so you can hear and see everything link:
th-cam.com/video/JsexpcB5Pt8/w-d-xo.html
does it make any difference if you connect transducers to the new board and another set of transducers to the second board with AD9833 and then turn on both devices at the same time? what happens if you use only transducers?
Thank you for your hard working, I just diy 1 base on this video and tested it, It works amazing to Android's mic but Iphone still can records my voice, ignores the noise, I think maybe Apple reduces the mic receive frequency bandwidth so it doesn't record the high frequency. Do you have any Idea?
It is less effective for iphones, they are using some advanced noise canceling software. I would sugest to built two jamming units and switch them on at the same time. I have also found that some of the ultrasonic transducers may have different polarity than marked (causing canceling of the signal by opposite phase) and it may significantly degrade the performance of the jammer.
Unfortunatelly I do not have an iphone to play with it so I am unable to improve this design at the moment.
@@justanengineer5599 thanks for your reply, I've googled some recording jammer's images and relize they ussually have a bigger speaker (maybe) beside 25khz transducers, I guess it act like a supper low frequency (under 20Hz) generator or sth like that, to cover the low threshold of sound, I am trying to figgure it out. Once again, tks to your help Sir. Good luck 🤞🤞
@@justanengineer5599 I would like to give you an iPhone as a gift so that we can improve this project together and manage to block iOS recordings
@@hovinh2765 I'm also researching this I think they use a piezoelectric 2.5-50 khz with an Acoustic Noise Generator generator designed to mix your voice and prevent the recordings from being clean, anyway if you find a solution please post it here as most are wanting it that works with iphones. Thanks
@@kadinbrasil8160 oke I will
This is basically a line-of-sight technology ? (Directional)
for expensive phones it seems to work this way. But cheaper phones and audio bugs are more susceptible and do not have to be placed in line of sight
@@justanengineer5599
Makes sense as expensive phones have advanced noise canceling.
Thanks for the reply 👍
hello I tested the 40khz with the 25khz of the last version together they had a small result but it seems to be the way to interfere in the iphone, obs I bought a similar equipment in aliexpress that uses 32 transducers 25khz and in the iphone it had a good performance at 1 meter. Any idea what can be done to make your project work on ios devices?
I would need an oscilloscope view of the signal generated by this jammer from aliexpress. By looking at the signal I would deduct what should I do to improve jamming capability. The signal may be from the audio receiver / transducer connected to the oscilloscope
Also some pictures of this solution (inside) would help especially info if they are using 25kHz transducers only or maybe combination of 25 and 40khz.
@@justanengineer5599 An observation is that the equipment generates noise at 120db at a distance of 2m yours generates 95db up to 1m I don't know if that helps
this means that better audio amplifier and more transducers are needed. Try to use TPA3116 module + 30 transducers per channel.
how much for one of these custom made with shipping to canada?
sorry but you would have to make it on your own. I am afraid that delivery cost is too high in comparision to building cost.
I tested main.c with a model without the AD9833 but on the iphone there was no interference more than 5cm from the transducers
main7.c you mean? main.c was not changed at all
@@justanengineer5599 yes main7.c
in the main7.c you have several options to tune this device
a)you can change 100 to other values in this line :
for(sequence=0; sequence
how can the microphone used in the video still works when the jammer was on?
because my camera was far enough and I have used zoom option. Another thing is that the jamming is highly directional
@@justanengineer5599 cool
With pam8610, is it possible to power this module from a 12V source and from a second 5V source (powerbank) AD9833 together with DIGISPARK?
yes. you have to attach 12v to Vin of Digispark and attach 5V (vcc) from digispark to AD8933 signal generator. The PAM module will be powered friom 12V directly
@@justanengineer5599 Thanks 😉
Hi Adam, I connected the PAM8610 module directly to 12V. I supply the AD9833 module with the DIGISPARK module via a 12V/5V converter. The jammer worked for about 6 seconds, then stopped working completely. I have 20 ultrasonic sensors connected. Where did the error occur? A wiring diagram would help......
I am wondering if 5V stabilizer on Digispark board got fried or something. You have to check the vcc lines with voltage meter on all of the boards
Everything seems to be recording correctly on usbasp, the attiny is new, I bought several to test, all the components are new, the circuit was assembled as shown in the diagram, but the speaker emits that sound from the video and the transducers emit something soggy but do not interfere on the iphone other than generating a loud noise along with the voice.
the video of the oscilloscope and operation is here:
th-cam.com/video/1Y3-YYj3Cos/w-d-xo.html
check the circuit because something is wrong there. The Digital to analog Converter is incorrectly build. You have some missing connection or some shortage. It does not work the same way as my prototype. The program has been uploaded succesfully but the problem is with connectivity of resistors. Check it 3 times it should be built exactly like this : github.com/mcore1976/antispy-jammer/blob/main/antispy-jammer-enhanced-schematic.png pay attention to the points where resistors are connected. Currently either you are getting the signal from single bit of DAC or this DAC is not working well because the resistor ladder is connected wrong way
Here you have the explanation how DAC is built www.electronics-tutorials.ws/combination/r-2r-dac.html
look for the picture "4-bit R-2R Resistive Ladder Network"
I also do not see capacitors on your board that shouls be connected nearby the chip GND and VCC
I took the test and studied all the material about using the transformer, but none of the tests worked, I also discovered that the project with digispark is not capable of interfering with the spy pen or the majority of spy devices, it only works on android phones and some models of cameras. Were you able to make progress on anything in the project?
I am waiting for delivery of the transformer to see if it improves the power of transducers
there are some people using speakers for 25khz model XHXDZ-3840 instead of transducers - ibb.co/JFHny9T
By changing few parameters in the code like random length of the pulse and number of the pulses I have achieved much better effectivenes on high end phones (uploaded new version of main7.c file for ATTINY85). You may also experiment wirh ATTINY13 chip as I have feeling that this code jamms even better (main8.c + ATTINY13 chip)
Also corrected Digispark version (mic-jammer.ino no AD9833 required)
I have doubts if you have experimented with these settings at all.
@@justanengineer5599 I installed the mic-jammer.ino digispark version, it really got better but it still works on the iphone, for android and newer devices it was perfect!
@@justanengineer5599 I tested the version with mic-jammer.ino, it improved performance on newer devices, but at a shorter distance, and it still has no effect on iPhone
Any progress?
(they are using transducers to send FM modulated signal and the speaker for high tones AM modulated signal random noise on 25kHz bearer frequency. The combination of both techniques apparently gives the best results. I will see if I can get AM modulation on transducers instead of the speaker)
Yes, I did some changes in the source code to my initial PoC version ( the one without AD9833 but with resistor ladder based Digital to Analog Converter) by sending not only FM modulated square pulses but also with AM modulation (amplitude of the pulse is random as well) :
The source code : raw.githubusercontent.com/mcore1976/antispy-jammer/main/main7.c
The compilation batch file for Linux : raw.githubusercontent.com/mcore1976/antispy-jammer/main/compileattiny85v3
The diagram : github.com/mcore1976/antispy-jammer/blob/main/antispy-jammer-enhanced-schematic.png
The prototype : freeimage.host/i/HYOoeJ1
It looks like it has slightly better effectivenes on newest phones. However I think that using transducers instead of normal speaker for AM modulated signal is bad idea. that is why the combination of both should be used - 25kHz transducers for FM noise modulated and 25kHZ speaker for AM modulated 25kHz carrier
When using transducers they have to be oriented exactly the way the microphone is placed. That may not be the case for the speaker, maybe it covers wider area
would it be possible to change the source of the newest one that made using the AD9833 so that it did this AM function with a speaker working with the other transducer so I think the effectiveness would be greater?
unfortunately not, the AD9833 chip does not have audio power regulation. You can only set the wave type and frequency and phase. No possibility to adjust the power... That is why I have used my old design to validate the concept with amplitude modulation.
We need to put additional digital potentiometer to use it with AD9833. If you have high tone speaker you may also test it if this helps with iPhones.
@@justanengineer5599 Got it, I'm going to assemble the old one now with the AM modulation changed and use the speaker here, I'll post the result with the Iphone in a little while, do you think that using the combination of digital with AD9833 and 25khz transducers, and this one with AM modulation and speaker on separate circuits, but the two at the same time, the interference effectiveness will be higher?
yes. I think using both types at the same time may help. Remember to put potentiometer as in the diagram and fine tune it not to get signal distorted
Witam.
Czy jest mozliwosc nawiazania kontaktu mailowego w celu rozszerzenia tematu? Pozdrawiam
tak, mój adres jest dostępny po zalogowaniu się na YT w opisie kanału pod przyciskiem
Could you create a new video or explain better how we can assemble with changes in the source code of the initial PoC version with AM modulation?
It would help a lot.
would there be a way to do it only with digispark and a Pam8406 that already comes with the 10k potentiometer in it?
I really need to get these results I ask for your help.
Hi. the digispark board cannot be used because there are some resistors attached to port B of ATTINY85 chip and Digital to Analog Converter cannot be created. You have to use discrete components and make it from the scratch like on my first video here th-cam.com/video/YBQ7A4W0bTo/w-d-xo.html Also ATTINY85 chip programming is needed as I am showing here th-cam.com/video/7klgyNzZ2TI/w-d-xo.html
The only difference is that you put PAM audio amplifier board instead of transistors
@@justanengineer5599 can i use the arduino uno, or usb recorder card to record the attinny85? Will it have the same result?
I set up the whole circuit manually, but when recording with the main7.c code changed to AM modulation, it records normally when I put it in the circuit, I am not having oscillation in the test port.
I already redid the circuit 5x and it is correct with your diagram, however I do not get a result, I will try again today, but I would like to know if I can use the arduino or ATtinny85 usb recording device to record and then put it in the circuit.
you meant flashing? I am flashing attiny85 chips with USBASP flasher. My scripts are prepared for this. yes, you can flash directly .HEX files from github to attiny as long as you have any compatible flasher. There is very important to flash also fuses the same way as my script does so attiny could run on 16MHz clock
@@justanengineer5599 I managed to record on the arduino uno using a library that seems to have worked because I have the same variation and modulation on the oscilloscope as yours, but it generates noise on the speaker adjusted by the 10k potentiometer, it interferes with the iphone but it is still possible to listen to it, I filmed everything if I could please take a look
the link is this: th-cam.com/video/6a0xi43v9rI/w-d-xo.html
I have seen the video. You have attached oscilloscope to one of atmega pins. please connect it to input of the potentiometer because we can only see single bit of the 5 bits of digital signal. I would like to see if Digital to Analog converter works. These pulses should have different amplitude but on your oscilloscope they look as they would have the same amplitude
I tried several combinations until I reached one that varied from 24 to 26 kHz with a tone in the speaker that looked like the ones emitted by equipment that works on iphone, but still without success on iphone
if you have a transformer there you could put it between an output of the PAM8406 and your Transducer Matrix. The point is that piezzoelectric transducers are mostly driven by the voltage not the current. You need some small transformer from the old power adaptor. The low voltage circuit should be connected to the PAM module and the 220V/110V circuit should be connected to the transducers. This way you amplify the voltage on the transducers. Measure the voltage before connecting transducers. They have some voltage limit and it may be around 100-150volts. It will give you enough power to jam the iphones
@@justanengineer5599 could put together a diagram with which transformer you can use so I would mount here to test
instead of transducers you connect 2 pins of low voltage winding of the transformer. 2 High voltage winding pins of the same transformer you connect to the transducers. As simple as that. Remember that PAM840x output is around 10V so the output of the transformer will give you 100-200 Volts. 60-80 volts on transducers will give you outstanding power of jamming
EDIT: JUST CHECKED THAT THESE CHINESE TRANSDUCERS HAVE MAX INPUT VOLTAGE 60V !!!! BE CAREFUL AND FIND PROPER TRANSFORMER WITH 1 TO 6 RATIO !
Transformer 220v to 48v would be just fine because it has 1:5 ratio
Remember not to exceed 60-80 Volts on transducers
see this specification
ibb.co/N2QqcSp
Can you post the link to the new file here please?
keep the same circuit? write the code in attiny the same as it was done with main7?
you have 2 options :
option 1 - use this schematic github.com/mcore1976/antispy-jammer/blob/main/arduino-mic-supresor-ultrasonic-v2.png and ARDUINO IDE for this code raw.githubusercontent.com/mcore1976/antispy-jammer/main/mic-jammer-ad9833-digispark.ino
option 2 : use this schematic github.com/mcore1976/antispy-jammer/blob/main/arduino-mic-supresor-ultrasonic-v2-ATTINY85.png
and avrgcc for this code
raw.githubusercontent.com/mcore1976/antispy-jammer/main/main6.c
and the compilation script
raw.githubusercontent.com/mcore1976/antispy-jammer/main/compileattiny6
both options are working the same and have better effectivenes on high end phones
I see you have removed all of the previous videos so I presume the device is working as expected 😀
@@justanengineer5599 I managed to stop this morning to test option 1, I really saw a significant improvement but it is still incapable of interfering with the iphone, but this is the way to go because before I needed to touch the iphone to the transducers to have an effect, now it works even at 10cm of height distance from the transducers with the iphone, and on the other devices it has improved a lot.
hi can this jamm phone microphone like jamm calls or something like that ?
yes it can jam phone microphone when someone is making a voice call
What about the range ? Thank you you’re the best ❤️
depends on microphone in the phone. Up to 5-10 is possible for cheaper phones
Can it for example play a sound like transmit a soud to jamm instead of noise ?
it is possible but not with this device
Well I build it and it works, but when the listening device is covered with clothes like hidden in pocket it will not work at all even in close range.
umfortunately ultrasonic waves have problems with clothing
@@justanengineer5599 Thank you for your reply and hard working, do you suggest anything to jam microphones covered with clothes? I tried everything but still coming out with empty hands.
I think only low frequency tones would be succesful like infra-sound
@@justanengineer5599 well I tried 19hz but it was not detected by iphone I think it has lowpass filter. May I have your email if possible?
my email is on the channels page
I am sending you the example video with an android and an iphone at this link:
th-cam.com/video/V1HdVRfnG1s/w-d-xo.html
In this link below is the interference distance test on the iphone:
th-cam.com/video/FabhvPDJA2A/w-d-xo.html
As you can see, the new code has improved the interference distance on the iPhone, but it has to be in the direction of the transducers and at a maximum distance of 2 palms, beyond that, it does not interfere with the iPhone, unlike androids that can be in any direction and at distances of 5m
Obs during the beginning of the recording there will be interference because it was recorded from an android
it looks like the iphone needs to be exactly in the line of sight of the transducer. Single transducer has around 30 degrees of beaming angle and when you are movin the iphone it looks like it is no longer in the center of the beam. I'm just wandering what would happen if these transducers would be packed more dense and if it could improve the jamming characteristics. Meanwhile i will try to work on the code in free time, maybe improving pseudo random base for the frequency generation and phase would make it more effective. Anyway it looks like the jammer is presenting an outstanding performance for most of the Android phones. In my tests I see it jamms almost everything in the range of 5 meters does not matter if it is an android phone or android based tablet. Also these phones do not have to be placed in the line of sight of the transducer matrix.
@@justanengineer5599 Yes, as for android, it is showing a perfect result, leaving only one solution on the iphone to make it work in general, when you see other modifications for us to test let us know thank you very much for everything
if you can do that and send me the exact list of component materials... I'll arrange and assemble it here by sending you the video.
use as many and as many components as necessary, the important thing is for the project to be successful so that you can put it on your channel and I can have the expected result. again thanks for the help.
Awaiting return!
i need first to purchase some board with MCP41010 chip or equivalent and try to connect it together with AD9833 to the same Digispark. It may be difficult because Attiny85 has only few usable pins
@@justanengineer5599 In that case, wouldn't an arduino nano or another microcontroller be more viable?
i will try to do it with digispark and if I fail then I go with other arduino. But first I need to select and purchase appropriate digital potentiometer board
@@justanengineer5599 ok wait, thanks
Hi, I was able to achieve better effectiveness on newest phones by modifying the code for AD9833 with random PHASE modulation. Please update the chip with new main6.c or Arduino INO code
now the installation seems to be correct see in the video:
th-cam.com/video/-IsvWLwJlLQ/w-d-xo.html
however, when placing the ATtinny in the circuit, the speaker generates loud noise, the transducers generate a different noise but are still not able to interfere with any device, the test was carried out 20cm away from the circuit, what could it be now?
it should give at least similar effect like the circuit with ad9833 signal generator. It looks like it was programmed correctly this time. Do you see the same type of pulses when oscilloscope connected betwen the test pin and GND like I am getting on my photos? pulses should have different amplitudes and the length should be around 20usec.
I just built a new circuit based on the 4-bit R-2R example, I still haven't connected the transducers and the speaker to test it, but I saw that the waveform changed, I'm sending you the video to see if it's correct. video link:
th-cam.com/video/V1zd8I55alM/w-d-xo.html
yes, it looks correct now. try to connect the speaker and transducers
In order for this project to be as effective as possible, you need to add an Acoustic Noise Generator designed to blend the voices and prevent the recordings from being clean. This would have an effect on apple devices and cell phones that have a noise reduction system, the most important question is how to create this acoustic generator as they are used in the most modern products as an example: th-cam.com/video/dy9U9BbFXYs/w-d-xo.html
which uses in addition to the 25khz transducers, they use a speaker with an acoustic generator causing iphones to record only distortions and echoes instead of voices.
Do you have any ideas to add acoustic noise generator to your project and make it more effective?
you would probably have to use modulator on 25kHz sourced by AD9833 generator.
I think the SIMPLEST solution would be to put the Digital potentiometer between AD9833 module and PAM8403 module and then steer this potentiometer with RANDOM values of amplification setting (via SPI BUS from Attiny). that would easily do the job of random modulation
@@justanengineer5599 Could you create some example image of how it would look in the circuit?
it would have to be something like this www.instructables.com/Digital-Potentiometer-MCP41100-and-Arduino/?amp_page=true with MCP41100 or equivalent . pins PB, PW placed between AOUT of AD9833 and input of PAM8403 module. I will see if I can reach the same scenario with predefined random sequence and ADC on resistors connected directly to ATTINY85 pins (my first hardware design of the jammer)
@@justanengineer5599 I see that you have high knowledge, I ask for your help so that I and your followers can run a complete interference project on iphones and android. if you can create something to help and make a video I will try to study and do it here too based on what you have just informed me, but in this case now a speaker would be used instead of transducers in this one so joining the two projects would you have this correct result?
th-cam.com/video/xB854dlKS4s/w-d-xo.html
they are using transducers to send FM modulated signal and the speaker for high tones AM modulated signal random noise on 25kHz bearer frequency. The combination of both techniques apparently gives the best results. I will see if I can get AM modulation on transducers instead of the speaker
I bought the Avr Usbasp Atmel recorder, it arrives tomorrow, I'm installing linux ubuntu to follow your video th-cam.com/video/7klgyNzZ2TI/w-d-xo.html
What version of ubuntu does it indicate?
use latest or 20.04. The software is available for all ubuntu versions.
@@justanengineer5599 are the main7.elf main7.hex files generated when main7.c code is compiled or do you need these files?
these ELF and HEX are generated from C file every time you run "compileattinyXX" batch script
That's right, thanks again for helping, tomorrow the record company that indicated arrives, so I'll be trying here, if I have any doubts I'll contact you again to see if you can help, it's very important for me to succeed in this, sorry for my lack of knowledge and the amount of posting in your publication.
no problem. Remember to do "chmod +rx compileattiny*" in linux to set execution rights to batch script
hello, this 40khz version I'm going to buy transducers to test it mic-jammer-40KHZ.ino My doubt is the 40khz transducers that I found are for measuring distance, would they be the same ones?
for most of the recording devices only 25kHz version works. You may test 40kHz version but it is only for some microphones. Ordinary 40kHz sensors used for distance measurements may be good for the testing. Sensors are also transmitters
did it worked with 40khz?!
@@TeraHertze in my test on the iphone 8s plus and 13 it didn't work but the use of the 25khz with the 40khz had an effect on the iphene at 60 cm of distance