Laser mic makes eavesdropping remarkably simple
posted Sep 25th 2010 12:00pm by Mike Szczysfiled under: laser hacks
Here’s a surprisly simple way to build yourself a laser-based listening device. It consists of two modules, a transmitter and a receiver. The transmitter is a set of lasers, one is visible red for aiming, and the other is infrared for measuring the vibration of a surface. Point the transmitter at the window of the room you want to listen in on and the laser can be reflected back to the receiver. The receiver module has a phototransistor to pick up the infrared laser light, and an LM386 audio amplifier to generate the audio signal sent to a pair of headphone. The need to be well-aligned which is easy enough using a pair of tripods. Check out the demo after the break.
Looking for something to do with the leftover laser diodes from this project? Try making yourself a laser microscope.
tagged: infrared, laser, microphone, diode, mic, spy, lm386, listening
Go there...
http://hackaday.com/2010/09/25/laser-mic-makes-eavesdropping-remarkably-simple/
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