How To Make A High-Tech Spy Stethoscope
Hear through walls with this high-tech spy stethoscope for under $25.
Step 1: Definition
A stethoscope is often seen as a symbol of a doctor's profession. it can also be used by safe-crackers and auto mechanics to hear sounds that otherwise could not be heard. Well, it's time to make a high-tech electronic spy stethoscope for under $25.
We'll be using a stethoscope, which I picked up at a local drugstore and a pair of multimedia microphones.
Step 2: Un-assemble
I carefully un-assembled the microphones and ended up with two mini condensor microphones and 3 1/2 millimeter mini stereo plugs. I was surprised that the specs on these microphones are actually quite good.
Then, I removed the earpieces from the stethoscope and drilled them out to match the microphone housings.
Step 3: Re-assemble
After some fine-tuning and a little hot glue, I reassembled the ear pieces and reassembled them on to the stethoscope.
I plugged these ear pieces into a mini stereo Y adapter, and then into my MP3 player and I got ready to record what I heard.
Step 4: Results
I was amazed at the clarity of this spy stethoscope and now, instead of a regular stethoscope, I could actually record what I heard.
I heard my wife on the telephone and decided to test it out on a wall.
"Sam, quit calling here. You're old enough to be my father."
There's my high-tech electronic spy stethoscope for under $25.