Nice! In my childhood I took apart a broken WalkMan and discovered if I connected a random ~8" loudspeaker driver in the tape head's place, I could eavesdrop o

Nice! In my childhood I took apart a broken WalkMan and discovered if I connected a random ~8" loudspeaker driver in the tape head's place, I could eavesdrop on my siblings and parents from across the house by placing the speaker against the walls or floor, complete with volume control and everything. It was incredibly sensitive, and infuriating to learn how much everyone was constantly lying and talking behind eachother's backs at that age.