this project involves the use and modification of laser devices. While the lasers I suggest using (store-bought red pointers) are relatively safe to handle, NEVER LOOK DIRECTLY INTO A LASER BEAM, BEWARE OF REFLECTIONS, and be EXTREMELY CAREFUL when MODIFYING a laser product. Also, I am not liable for anything stupid you do.
Using a basic laser pointer and a sensitive amplifier it is possible to listen in on conversations through exterior windows! The price of $20 is simply an estimate, in my case I did not need to buy anything.
The system described in this instructable works on the same principle as commercial projects like this:http://www.electromax.com/laser.htmlhttp://www.electromax.com/laser.html
NOTE: For a similar projects that may be of interest, check out my blog
check out my blog. You may find of particular interest the Polarizing Laser Music Mixer!
Polarizing Laser Music Mixer!
(Photo of me in the lab, with my own bad-ass glasses, replacing the random military dude who was there before.)