Heathkit Groundtrack GR-1290 metal detector schematic diagram

  
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The original coil that came with the Heathkit project was preassembled at the factory. It had a diameter of around 15cm (6 inch). A larger (30cm, 12inch) coil can be made using the following data:
Heathkit Groundtrack GR-1290 metal detector schematic diagram - schematic




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