To process the signal from the search coil, I use the analog-to-digital converter built into the ATmega microcontroller. ![]() Such a weak signal for reliable detection needs to be amplified, for which I used the operational amplifier U1 LM358N, included in the traditional non-inverting amplifier circuit. ![]() The signal from the search coil connected to the J2 connector, through the current-limiting resistor R2, is supplied to the diodes D1 and D2 connected in parallel, limiting the signal to ~ 1 V. The resulting eddy currents counteract the reduction of the magnetic flux, which is manifested in a change in the voltage curve on the coil and is noticed by the device. This phenomenon causes the occurrence of eddy currents in the target, penetrated by this magnetic flux. With a sharp decrease in the current in the search coil, its magnetic flux also decreases sharply.
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