26 February 2016 User ReviewCheck your delivery options:
This electronics project circuit will detect medium sized metallic objects. A copper coil is used to sense the metal. Sensing coil is a part of tuned weak colpitts oscillator in the circuit. So coil will produce some magnetic field. When the coil is placed near to the metallic object, it will cancel magnetic energy and oscillator will stop working. This will make the final transistor near to the buzzer conducting and activates the buzzer. Assemble given electronics components on to the PCB provided. After fixing all the components solder it firmly to the board and give 9V supply from the battery.