“While looking for further ideas for a simple Ardino Pulse Induction metal detector with only one supply voltage I came across the homepage of Teemo:
http://www.digiwood.ee/8-electronic-projects/2-metal-detector-circuit
He created a simple Pulse Induction detector using the LC-Trap principle. Similar circuits were posted here on Instructable by TechKiwiGadgets. Exept that the Teemo circuit uses the internal comparators of the a PIC microcontroller, thus needing less external components
So I was challenged to use the Arduino instead of a PIC-Controller for this schematic and look how far I can get.”