The scenario
A pulse induction metal detector front-end where an ESP32-S3-N16R8 generates the coil pulse via PWM, driving an IRF740 MOSFET to pulse the search coil and clamp flyback with a Schottky diode.
What is in this drawing
Read the decisions behind it.
01
Use ESP32-S3 PWM output to directly control a MOSFET gate for pulse induction
02
Place flyback diode and damping resistor across the search coil to protect the MOSFET and shape the decay
03
Include decoupling capacitors on 12V and 3.3V rails for clean switching
Useful as a verified power-stage reference when integrating an ESP32-S3 into a Spirit Pi style PI metal detector.
More like this