Listen to conversations over long distances with a homemade laser listening device. All you'll need is a laser pointer, tripod, old pair of headphones, photocell and a recording device. Your completed laser spy microphone won't be the most practical recording setup you've ever used, but it's an interesting bit of science and a great DIY project. The process involves a simple bit of soldering, but in all it's very simple.
Build a Laser Spy Microphone On the Cheap
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