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Very low frequency (VLF), also known as induction balance, is probably the most popular detector technology in use today. In a VLF metal detector, there are two. Author: Jeff Tyson; Heathkit Groundtrack GR-1290 VLF metal detector. The schematic diagram of Heathkit Groundtrack GR-1290 VLF (Very Long Frequency) metal detector

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How metal detectors work - short theory and example circuits for VLF (Very Low Frequency), PI (Pulse Induction) and BFO detectors. Electronics Sitemap Home Metal detectors Theory and practice ... Example VLF design: Heathkit Groundtrack GR-1290 VLF metal detector. Pulse Induction (PI) metal detectors are sending repeated pulses of electrical ...

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Nov 10, 2009· Metal detector circuit diagrams and projects. Note that all these links are external and we cannot provide support on the circuits or offer any guarantees to their accuracy. Some circuits would be illegal to operate in most countries and others are dangerous to construct and should not be attempted by the inexperienced.

heathkit groundtrack gr 1290 vlf . Heathkit Groundtrack GR 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.The controls were set as follows: ... information about Best ...

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