At this very moment, electromagnetic waves are flying around our residences, coursing through our bodies, and interacting with us in countless ways. It’s a marvellous unseen world, strange and amazing enough to make one at least sympathize with those that express fears over such phenomena.
While not always intentional, all electronic devices emit electromagnetic radiation/waves to one extent or another. If you’d like to explore the electromagnetic output of everyday objects, then check out the Circuit Surfer from Fusco. This device uses a copper coil inductor as a sort of electromagnetic microphone/short range antenna, which when held up to an electronic device emits interesting, and generally high-pitched, noises.
As shown in the video below, the face of a cell phone makes different noises depending on the sniffer’s position. A fan makes a low drone sound, while a traffic light buzzes when illuminated. A flashing bicycle symbol is especially entertaining as it blinks/beeps in a predictable pattern.
The device is powered by a 9V battery, and features a 3.5mm jack for audio output. While interesting, you’ll want to keep the volume at a relatively low level when using it per its unpredictable crackling and high-pitched squealing.
source https://blog.tindie.com/2022/01/circuit-surfer-electromagnetic-sniffer/
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