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
Metal Detector DIY Tutorial - KIT by ICStation - YouTube
Minelab Equinox/Manticore ,hints, tricks and tutorials. | Facebook
Metal Detector Using 555 Timer with Proteus Simulation - DEV Community
Simple Metal Detector : 8 Steps (with Pictures) - Instructables