El escenario
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.
Qué hay en este dibujo
Lee las decisiones que hay detrás.
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.