(if you can't see video, go to my channel and see version without banned music !!) Pulse induction metal detector, my DIY (hand made) project. You can find everything about metal detector on this three links ...
by Carl TBFM0
by Needlepointers
by Loves2Loom
by MsDisneyReviews
by 3F Studios
by Jake Folger
by craftyponies