Gold Finger Metal Detector Circuit Board

The principle of high-frequency oscillator detecting metal:

As the professional manufacturer, Viafull would like to provide you Gold Finger Metal Detector Circuit Board. And Viafull will offer you the best after-sale service and timely delivery. Adjust the gain potentiometer of the high-frequency oscillator to make the oscillator just in the critical oscillation state, that is, the oscillator just starts to oscillate. When the detection coil L1 is close to the metal object, due to the electromagnetic induction phenomenon, eddy current will be generated in the metal conductor, increasing the energy loss in the oscillation circuit, weakening the positive feedback, and weakening the oscillator, or even unable to maintain oscillation. The minimum energy required has stopped. If this change can be detected and converted into a sound signal, it can be judged whether there is a metal object under the detection coil based on the size of the sound.

Data Sheet