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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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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. ... Heathkit Groundtrack GR-1290 VLF metal detector circuit diagram and detector coil construction notes: Metal: Jun 27, 2010: 0:

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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. Voltages were taken with a 9 Volt supply and a setting with no sound coming from the speaker.

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Re: Heathkit GD-1290 Groundtrack « Reply #8 on: August 19, 2011, 12:57:52 pm » how good is this at detecting tiny nuggets a foot or so below the surface? would be nice to find lots of large nuggets but in practicality the smaller ones are probably the way to search. maybe this thinking is flawed..

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groundtrack@ vlf metal locator 4.av c13 17-8m r29 417-bØi r33 øøz 1 scrrminrt search coil r39 øøø a47 model g r24 470 08 417-ess c14 22k 4.5v r37 r38 1 øøx r51 47k rs2 47k 04 s6-56 viol søøøn r26 220 clø i øøpf r27 33k 2.3v r28 1 øøø . ØØsb cle 82øpf 5. sv wire meter cal 2. s. gry r53 s. 417-bØi

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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 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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Heathkit Groundtrack GR-1290 VLF metal detector Notes 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.

Sep 14, 2011· Example VLF design: Heathkit Groundtrack GR-1290 VLF metal detector Pulse Induction (PI) metal detectors are sending repeated pulses of electrical current to the search coil, producing a magnetic field.

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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:.. This circuit is under:, sens detectors, metal detector circuits, Heathkit Groundtrack GR 1290 metal detector schematic diagram l45233

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tors, the deluxe GD-1290 “GroundTrack” was released. ... Q1 is a VLF oscillator that uses L1 and C2 to produce a 100 KHz signal. The transistor’s bias is provided through R1. This oscillator has an ... Heathkit_053_GD48 Metal Locator ...