pi power

[jeep6789]

Ask everyone! In order to simplify the circuit, I would like to use the single power supply to supply options, production of PI detector, then how the coil is connected to the operation, so that the operation of the work, because my open is the microcontroller directly sampling, 省 去 to the DC amplifier circuit, please help everyone

[Qiaozhi]

Ask everyone! In order to simplify the circuit, I would like to use the single power supply to supply options, production of PI detector, then how the coil is connected to the operation, so that the operation of the work, because my open is the microcontroller directly sampling, 省 去 to the DC amplifier circuit, please help everyone

Before attempting to jump in at the deep end, it would be a good idea learn how metal detectors work. Then build a few circuits in order to understand the limitations.
I suggest reading ->Inside the METAL DETECTOR - Second Edition - Published 2015
and building some of the projects before moving on to -> Arduino Nano Pulse Induction Metal Detector Project - Published March 2021

[Carl-NC]

A simple way is to capacitively couple the preamp input. I've seen this in projects posted here but I can't recall which ones.