laser diy schematics

Posted on Feb 5, 2014

No DIY espionage kit is complete without a long-distance listening device, and no DIY long distance listening device is complete unless it uses a sweet laser in some form or fashion. If you agree with that statement, then you`re in luck, because the following project will show how you can use a laser pointer to hear noises from hundreds of feet away.

laser diy schematics
Click here to download the full size of the above Circuit.

material : Laser pointer, Old pair of headphones, Cadmium Sulfide Photocell (available at most Radio Shacks or electronics store), Tripod, Binder clips or duct tape, Laptop or other recording device. Plug the headphone jack into your laptop or other recording device. Using binder clips or duct tape, secure the photocell to something sturdy so that it can be easily moved and aligned. Find a room with a window you`d like to spy on, and aim the laser at the window at an angle. Determine where the laser reflects, and situate your photocell so the reflected beam hits the front of the cell. Any noise from inside the room will cause the window to vibrate, which will get picked up by the laser and photocell. You might have to process the raw input to remove unwanted noise and isolate the voices. Check out the cool video to see it in action.

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