Sign up for Keysight World: Innovate at https://keysig.ht/enJywf and learn about the visions of tomorrow, before fiction becomes reality! With few incidents, I think I made what is called a BFO metal detector, which actually works very well over a large distance. Get your ElectroBOOM Bundle at https://www.circuitspecialists.com/electroboom-101-kit.html My new MERCH: null Thanks for your support @ http://patreon.com/electroboom Post your submissions to: http://reddit.com/r/electroboom My Facebook: http://www.facebook.com/ElectroBOOM My Twitter: http://twitter.com/electroboomguy My other articles: https://www.electroboom.com/ Thanks to Circuit Specialists for proving my essential lab tools, my referral link: https://www.circuitspecialists.com/?ref=l2p0t4z1 Also thanks to Keysight for their awesome scopes and meters: http://keysight.com/ And thanks to Lulzbot for 3D printer and filaments: https://lulzbot.com/ Checkout my Amazon picks (my affiliate link): https://www.amazon.com/shop/Electroboom Below are my Super Patrons with support to the extreme! Nicholas Moller at https://www.usbmemorydirect.com/ Sam Lutfi Zoddy Ambiance Domotique My sponsors and top patrons: http://www.electroboom.com/?page_id=727 Enter your school for tools: https://goo.gl/forms/VAgRre8rLVvA1cEi2 By: Mehdi Sadaghdar 0:00 Wrong Way of Detecting Metal 1:48 Theory Behind How Metals Effect Inductance 6:10 More Fake and Real Metal Detector Video Tutorials 7:32 Designing a “Simple” Metal Detector Circuit 15:48 Testing the DIY Metal Detector Circuit