A metal detector has multiple practical applications in reality For example, it is used in inspections by security personnel when entering places that require safety and security, such as airports, tourist places, and important government buildings, In addition to its use in exploration and search for the presence of metal under the earth's surface at different depths and dimensions.

And to build the electrical circuit for the control box for this device, we used an integrated circuit that amplifies the sound with low voltage (LM358). And an amplifier and also an integrated circuit that works as a control in many electronic circuits which is the timer (NE555).