Our pulse metal detector circuit has several main components in it. Arduino generates pulses, they are amplified by a field-effect transistor (power switch), which in turn induces pulses of a magnetic field in the coil. The magnetic pulse travels to the desired metal and induces a current in it, and then a return signal of the magnetic field. This reverse magnetic flux, after a short delay, returns back to the coil of the metal detector and generates a pulse. The signal passes by a pair of diodes (diodes are needed to limit the voltage to 1 volt) and goes to the input of the operational amplifier. The amplified signal enters the arduino in which the “falling tail” is calculated after the coil is disconnected with the power switch. Those. just the answer from the desired metal object. Depending on the decay time, we can judge the size or distance of the object. The indicator shows this value in 8 levels of indicators.
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