metal detector circuit

Posted on Feb 4, 2014

This is a project of a simple metal detector circuit. The circuit is easy to build using only one transistor and few other components. The circuit is a colpitts oscillator which boradcast on AM band. Take a good quality am receiver and place it near this circuit and search the signal in your radio, when the radio found the signal you will hear no

metal detector circuit
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sound. Now when you place this metal detector circuit near any metal object you will hear hissing sound from your AM radio. L1 is equal to 60 turns of #36 enameled copper wire wound on 1cm PVC tube. A 6V or 9V battery should be used to power the circuit. Do not use power supply to power the circuit it will create noise.

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