Description

This DIY Electronic Metal Detector Kit is an affordable and simple way to detect metal objects using basic electronic principles. The circuit is based on a Colpitts oscillator, operating at a specific frequency, and a pocket AM radio tuned to the same frequency.

To use the metal detector, the circuit and radio are placed close together, and the radio is adjusted until no sound is heard. This happens because both devices are in sync, and their frequencies cancel each other out. However, when a metal object comes near the detector’s coil, the inductance changes, altering the oscillation frequency. As a result, the balance is disrupted, and the radio emits a hissing sound, indicating the presence of metal.

This kit is perfect for hobbyists, students, and experimenters looking to understand the basics of inductance, oscillation, and frequency tuning while creating a functional metal detector.