상황
A hobbyist designs an ESP32-S3-based pulse induction metal detector with a double-D search coil and needs a clean netlist schematic for PCB layout.
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01
Model the double-D coil as a transformer with transmit and receive windings
02
Switch the TX coil with a BC547 NPN transistor driven by the MCU pulse pin
03
Amplify the RX coil signal with a discrete BC547 preamp before the ESP32 ADC
Use for Schematex circuit diagrams of ESP32-S3 PI metal detectors with double-D coils, 12V supply, and ADC front ends.