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Listen inside of a building hundreds of yards away using a laser.Please rate, comment, and digg!!
i think theres one of them in every Furby right between the eyes
By Ross350 1187258608I saw this was mentioned on the tv show "Burn Notice" as a listening device used by fbi, etc... He took a picture from his window with a digital camera to see if there is a laser microphone, saw the dot it produced in the camera... and then they strapped a vibrator to the window to prevent them from listening. Good show... And Good DIY Video!! 5*'s
By cRiTiCiZeD 1187244663Telephone signals travel over fiber optic cables all the time. So do television signals. It's called modulation.
By FrankDK 1187218568it's called Multiplexing. and it's not 1, or 2, or 3, but thousands of phone calls
It's also in digital format. as in "light off" or "light on". sound, as you hear it, isn't a digital format. it can be approximated digitally (cause if it couldn't, how else would CDs and MP3s work?),but it's not possible to transmit raw analog data though a digital medium. there needs to be some conversion and de-conversion, on top of the Mutiplexing and demultiplexing...
... The light in an optical wire is turned on and off to create bits just like the computer does.
Doesn't this photocell measure the wavelenght of the light that hits it and translate it into diffirent voltages which then is translated to sound through a speaker?
The wavelenght of the laserlight will change everytime the window vibrates cause it has a longer or shorter distance to travel to hit the window.
I realize that FrankDK just illustrates that the transition from light to sound is not so farfetched, but it is done in two diffirent ways in this video and in a optical wires.
It's the amplitude of the beam that's being measured by the cell - the wavelength is a constant (in the case of a red laser pointer, 650nm) :)
By Funditor 1187264057PLEASE DONT READ THIS!!!!U WILL GET KISSED ON THE NEAREST POSSIBLE FRIDAY BY THE LOVE OF UR LIFE. 2MORROW WILL BE THE BEST DAY OF UR LIFE.HOWEVER IF U DONT POST THIS COMMENT TO ATLEAST 3 VIDEOS U WILL DIE IN 2 DAYS.NOW UV STARTED READIN THIS SO DONT STOP NOW!THIS IS SOOO SCARY.SEND THIS TO ATLEAST 5 VIDEOS IN 143 MINUTES WHEN UR DONE PRESS F6 AND UR CRUSSHES NAMEWILL APPEAR ON THE SCREEN IN BIG LETTERS THIS IS SOO SCARY CUZ IT ACTUALLY WORKS!!!!!
By orosol 1258006824i cant find any headphones that have 3 wires, i checked all kinds of 3.5 mm audio jacks, headphones with and without mic, and a couple dollar store models of headphones. no luck. any suggestions?
By nyupfront 1230963787First, this is a great video thank you. I'm trying to understand this, forgive the newbie over here.
The laser reflects off a window, and the vibrations are translated into sound then into the computer.
How does the reflection get sent to the diode however? I see some comments mentioning lazer pointers with led ends that are reflectors, however I'm unable to find anyone online.
Thanks for the help, assuming someone replies!
but your explanation is lacking. you need to go into more detail on the set up and such. the average person is not going to understand what you mean or are doing.
By lowellfranck72 1226941650Cool vid...maybe you should check out this video comp i found on youtube. The video ID is: BI7gn6eYgW8
By loutoon 1218447216I google'd "Laser Pointer with Reflector" and came up with nothing? Did you make the little thing coming out of the back of the laser that shoots it back at the photo cell?
By object_being 1196035478Nevermind, I found it! Thanks anyway, can't wait to get this thing up and running!
By object_being 1196035627Howdy friend, your comment was a year ago but do you remember where you found the laser pointer--or at least what I should be searching for?
Thank you!
Who need this ??? Even if someone give it to me I wouldn't use it
By TAMARIN 1192981930Hi,
I would like to have the refrences of the pointer you used in order to buy the same. is any laser pointer sold with a reflecter?
whts the little bit that is coming out of the laser pointer?!?!?
i cant find a laser pointer like that that has a relecting thing at the back... certainly not a 2 dollar item.
By FatPumPumLovah 1188421140its a cheap laser pointer i've seen in many films on metacafe. i happen to have gotten mine at cvs. they are like 3 bucks and the extra little arm thingy has an led in the end of it. thats why there are 2 buttons on the side!
By Twi7ch 1200360319Although you could use this with pretty good results for relatively small distances, even better with an AF amplifier after the photo cell, it gets pretty useless for larger distances because lasers avaiable to public still have a considerable beam angle, and the beam becomes larger and weaker as the distance gets bigger. Nevertheless, a good idea to use if you need it and you know how to solder a couple of wires :P
By sinekt 1188084336your laser mic is good if you can get the laser to reflect back onto the photocell . listening to a conversation in a building even 50 metres away would require you to be directly in line with the window . looks good in hollywood , but impractical in real life !! well done tho !!
By dragon_64 1188002092Very cool idea! I recommend taht you use a some kind of Infra Red laser pointer, otherwise people behind that window could see you. But there is another prob: how do you know when the light is hitting the photocell? Easy! Just turn on a digital camera and help yourself with it! Why? Because cameras ca actually see what a human eye cant: infrared :)
By David1994 1187968301Good insight, subscribe to my channel and you will see this concept put to a different use on monday!
By Funditor 1187974926But I'm curious as to the max. effective range? And if I used an IR laser, how would I be able to see if it was focuse on the photo-cell?
Props on the idea though, I've seen it before on a show about why the CIA and FBI now have dual paned seperated windows outside their buildings.
:)
The effective range I don't know. Fairly limited with a cheap laser, but quite good with an expensive one and a lens to focus the beam.
For using the IR laser, you can use nightvision equipment or an IR equipped camera.
they see the red dot shining on their inside wall (lasers go through glass as well as reflect). They will call the police on you and you will get busted.
By pennsteve676767 1187224239Use an infrared laser with, say, roughly 800nm light.
The light is invisible to the eye, but you can still see the reflected spot using a digital camera (which can see near-IR light.)
before and i was sure that federals would use that, but to see this could be done so easy and cheap by everyone scares me quite a bit!
By 4k33m 1187222903Nice video...But i'm happy to live very far from you... ;-D
5`````and digg.
how do you get the laser to reflect back to the photocell?
By lukewarm27 1187210037It is reflected off of the window which you are trying to listen in on....
By Funditor 1187211665Can you do this without preparing the room. ie for spying on next door?!
By pieisgood 1200128540You can't create an audio signal using a resistor. The photocell RESISTS current, it does not create it! This is possible, but requires a much more complex circuit.
By Ziggythewiz 1198277609I'm sorry if this wasn't clear, but the 1/8" jack is plugged into a recording port.... the recording device supplies the current.
By Funditor 1198302795And then what in the hell is a microphone? A resistor. Do a bit of elementary reading before opening your mouth.
By Funditor 1198285783Yes, a microphone uses a resistor, to resist a current. Nothing in your circuit is creating any current.
By Ziggythewiz 1198302552the computer is creating the current moron. i think he expects people to have a brain big enough to fill those blanks by themselves.
By johnathon007 1206081798GOOD LUCK trying to allign the laser reflection onto the LDR (Light Dependant Resiter - ''photocell'' my arse!)!!! also, i doubt this works on double glazed or even triple glazed windows ;)!!
By mttw 1188320279what is the black wire protruding from the back of the laser pointer and what is an easier way to see if the laser pointer is hitting the sulfide photocell
By kamakazi103 1188163350That's actually an LED neck lite that's part of the laser..... Easier way? You tell me :)
By Funditor 1188170685