Probably like most of you, I have a lot of old headphones that are broken in some way or another. I have been looking for something creative to do with them for a while and today I made the dive.
So yea. I just ripped the end off of some headphones, soldered a connection to a copper penny, then super-glued the penny onto some old headphones.
Next, I plugged my headphone jack into my computer, and for fun, pressed both pennies against my arm. Sadly, they didn't pick up anything but noise (or if they picked up more than noise, I didn't notice).
Next I decided to add two passive low-pass filters to the circuit. I have no idea why these would make any difference but here they are. There are two resistors in series (2x220 ohms) followed by a 10 uF capacitor for each input channel. Here's what I heard this time: Sound
To my surprise, it appeared I was picking up some kind of radio station? What's happening here?? Can anyone explain why this is?
Edit2: I also want to add that this only happened in an upstairs room of my home. It didn't work when I carried my laptop downstairs. It's possible this could've been related to the way I was sitting (and how the electrodes' wires ran away from my body), the fact that my laptop was plugged in when I was upstairs and not when I moved (60Hz noise added power to the signal through some sort of wavelet addition?), or when I went downstairs the signal was less intense because of some unpredictable location attribute (e.g. an upstairs neighbor playing the radio next door). My favorite theory though is that this is somehow due to the EMF running along the outside of our skin. Can anyone disagree?