Homemade metal detector

  
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This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability. It is not suitable for buried coins discovery that is not sensitive enough but you can detect pirates treasures! The metal detector is powered by 2 x 9V batteries, each of it charges with 15 mA. L1 detector coil is part of the si..
Homemade metal detector - schematic




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