Surfmaster PI Metal Detector Schematic Diagram

  
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If TIP32C (Q2) gets excessively hot, use an IRF9640 MOSFET instead. Experiment with different values for R6 to find the optimal value (I use a 390 ohm resistor). Temporarily substitute R6 for a trim potentiometer (470 or 1k) to find the optimal dumping resistor for your coil.
Surfmaster PI Metal Detector Schematic Diagram - schematic



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