It has now been over 100 years since Heinrich Barkhausen published his description of a crackling sound heard when a piece of iron is magnetized inside of a coil wired to a set of headphones, and this phenomenon provided evidence for the theory of magnetic domains. Traditionally, this effect is performed as a demonstration by connecting the coil to an audio amplifier, such as one used for electric guitars.
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James Lincoln; The Barkhausen effect revisited using LEDs. Phys. Teach. 1 February 2020; 58 (2): 140–141. https://doi.org/10.1119/1.5144805
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