Laser Espionage Microphone (how-to)

[begood]

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.

Laser Espionage Microphone (how-to) [MetaCafe via DIY Life]

Build a Laser Spy Microphone On the Cheap

Video : Laser Espionage Microphone (how-to) - Video

[m32mark]

Interesant, si cam la ce distanta functioneaza, stie cineva? + ca un defect ar mai fi ca trebuie sa fii perpendicular cu geamul respectiv, ceva asemanator am vazut mai demult

[begood]

merge cu un laser decent dintr-un bloc in altul, sa spunem 50 m ?

depinde si de tipul geamului, daca e zi / noapte / ploua / etc

imi dau cu parerea la valoarea de mai sus, am testat, merge pana pe un bloc indepartat de mine (150 m) deci...75 dus 75 intors, daca geamul e perfect plan, dar cum asa ceva nu se intampla => mai greu.