ELECTRONICS
Spirit Pi Metal Detector
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CASE ANALYSIS
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.
Key decisions
- Use ESP32-S3 PWM output to directly control a MOSFET gate for pulse induction
- Place flyback diode and damping resistor across the search coil to protect the MOSFET and shape the decay
- Include decoupling capacitors on 12V and 3.3V rails for clean switching
When to reuse this
Useful as a verified power-stage reference when integrating an ESP32-S3 into a Spirit Pi style PI metal detector.
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