ELECTRONICS
Spirit Pi TX/RX & Preamp Interface
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CASE ANALYSIS
Scenario
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.
Key decisions
- IRF740 drives the TX/RX coil from a fused 12V supply
- 3V3 shunt zener rail biases the NPN emitter-follower preamp
- ADC input uses zener clamping and a 10n filter before ESP32-S3
When to reuse this
Use for metal detector interface boards connecting a Spirit Pi coil to ESP32-S3 analog inputs.
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