This is just a simple short range metal detector that uses an LC oscillator with the sense coil acting as the detector coil. When a metal object is placed near the detection coil the inductance of the inductor is altered (due to eddy currents produced in the external metal object). This increased or decreased oscillation frequency causes a decreased or increased DC analog voltage. When this analog voltage reaches a certain threshold, the green LED will turn on, turning off the red LED in the process – indicating that metal has been detected!
This is just a simple short range metal detector that uses an LC oscillator with the sense coil acting as the detector coil. When a metal object is placed near the detection coil the inductance of the inductor is altered (due to eddy currents produced in the external metal object). This increased or decreased oscillation frequency causes a decreased or increased DC analog voltage. When this analog voltage reaches a certain threshold, the green LED will turn on, turning off the red LED in the process – indicating that metal has been detected!
What program are you using to sim?