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DIY Laser Spy Microphone - All
What is an op amp? Operational Amplifier tutorial & super spy microphone...
DIY FM Spy Microphone (Spybug)
I need to build a laser microphone like this! Not to be a creepy spy, but just for the challenge.
How To Make Spy Microphone! Super spy microphone made from plastic parabolic dish,old game fun for handle and earbuds with mic and all this work on your smartphone.
Make your own Parabolic Microphone: http://mods-n-hacks.wonderhowto.com/how-to/eavesdrop-from-distance-with-diy-parabolic-spy-microphone-0139405/
What is an op amp? Operational Amplifier tutorial & super spy microphone circuit - YouTube
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Squirrel-Baffle Spy Parabolic Microphone | Make: