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Heathkit Groundtrack GR-1290 VLF metal detector , Heathkit Groundtrack GR-1290 VLF metal detector All resistors are 1/4 watt, 5% tolerance and all capacitors are in microfarads (uF) unless marked otherwise Voltages were taken with a 9 Volt supply and a setting with no sound coming from the speaker
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Heathkit Groundtrack GR-1290 metal detector schematic , This circuit is under:, circuits, Heathkit Groundtrack GR 1290 metal detector schematic diagram l45233 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:
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