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 …

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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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Review (mpn:gd-1290 for sale) Gd-1290 Model Groundtrack Locator Heathkit Vlf Metal . List your items fast and easy and manage your active items. 99 and 15 shipping. Here are some of the specs sensitivity dime at 4 to 6 typical operating freq Phone khz method of detection induction balanced circuit detector output meter 3.

Re: Heathkit Groundtrack GR-1290 VLF metal detector « Reply #2 on: April 17, 2014, 11:53:27 am » سلام من اين مدار رو ساختم اما دا خلي شماتيك پي سي بي كه گذاشتيد مشكلي وجود داره داخل q3 & q5حتما برسي كنيد و خبرش را به من هم بدهيد

Heathkit Groundtrack GR-1290 VLF metal detector | Metaldetector-RJ The original coil that came with the Heathkit project was preassembled at the factory. It had a diameter of around 15cm (6 inch).

Heathkit Groundtrack GR-1290 metal detector , This circuit is under:, sens detectors, metal detector circuits, Heathkit Groundtrack GR 1290 metal detector schematic diagram l45233 The original coil that came with the Heathkit project was preassembled at ,...

Heathkit GD-1190 Cointrack Metal Locator Schematic Heathkit GD-1246 Recharging light ... Heathkit GR-110 VHF scanning monitor Heathkit GR-1290 Groundtrack VLF Metal Detector Schematic Heathkit GR-151A transistor radio schematic

Nov 18, 2012· Heathkit Cointrack GD-1190 metal detector schematic diagram. Schematic diagram of Heathkit Cointrack GD-1190 metal detector …Heathkit Groundtrack GR-1290 VLF metal detector White’s Classic I metal detector … »More detailed

Join the excitement of treasure hunting with a Heathkit Metal Locator Search for old coins, artifacts, treasure - any metal object you want to find. Our finest Locator features a Very Low Frequency (VLF) Ground Balance Mode. You can use it anywhere for finding almost anything in any kind of ... Kit GR-1008, Shpg. wt. 1 Kg 24.95 Precision ...

Jun 04, 2014· This is for a VLF Metal detector which from what i have read looks for small phase changes to determine if metal is found. i may have this all wrong as i am new to electronics but i think that Q8 L1 & L2 are acting as some type of oscillator transmitting a 7.3Khz signal.

Apr 07, 2013· hello this is a nice solid working vlf machine test is for showing max taget distance.

Heathkit Groundtrack GR-1290 VLF metal Detector - Schematic Only, no circuit description__ hobbyteam @ hobby-hour Home Made Metal Detector - This homemade metal detector circuit will help you find objects composed of materials with relatively high magnetic permeability.

The following units are in our BoneYard which is available as a source of used parts. These units qualified for 'BoneYard' status due to non-functionality as a complete unit.

Heathkit Cointrack GD-1190 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 , Heathkit Groundtrack GR-1290 VLF metal detector;..

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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. ... Heathkit GD-48: To show you how ... I bought a Heathkit "metal locator" in the early 70's and ... the new 1974 A.H. Pro discriminating metal detector, and a lifetime ...

I just received a complete Heathkit Manual for the Model GD-1290 Groundtrack VLF metal detector. If someone needs information from the manual, please let me know. Linkback:

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Heathkit Groundtrack GR-1290 VLF metal detector - … The schematic diagram of Heathkit Groundtrack GR-1290 VLF (Very Long Frequency) metal detector Metal Detector Working with Circuit and its Applications

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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.

Heathkit GD-48 Metal Locator. Introduction: Buried Treasure? Aye Matey, I was saving this ... tors, the deluxe GD-1290 “GroundTrack” was released. Table 1 gives the production dates as best I can ... Q1 is a VLF oscillator that uses L1 and C2 to produce a 100 KHz signal. The transistor’s bias

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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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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 …

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