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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.Volt

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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.The controls were set as follows:

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