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I don't understand the working principle of this metal detector circuit? - Electrical Engineering Stack Exchange
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Electronic Project 40: A Metal Detector for Security Device using the principle of a tank circuit for inductive sensing and with the aid of op-amp, speaker and arduino uno — Steemit
![Molecular Expressions: Electricity and Magnetism - Interactive Tutorials: How A Metal Detector Works Molecular Expressions: Electricity and Magnetism - Interactive Tutorials: How A Metal Detector Works](https://micro.magnet.fsu.edu/htmltutorials/source/electromag/detector/images/bluelines.gif)