상황
A pulse induction metal detector front-end where the ESP32-S3-N16R8 drives the TX MOSFET and samples the conditioned RX signal through an ADC pin.
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01
IRF740 drives the TX/RX coil from a fused 12V supply
02
3V3 shunt zener rail biases the NPN emitter-follower preamp
03
ADC input uses zener clamping and a 10n filter before ESP32-S3
Use for metal detector interface boards connecting a Spirit Pi coil to ESP32-S3 analog inputs.