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23/08/2015  Differences between Heatkit GR-1290, GD-1190 and GD-1290. I am new to this forum Hope someone can clear up my confusion about the three Heathkit metal detector models, i.e. the GR-1290 the GD-1190 and the GD-1290? Does anyone know the difference, like operating frequency, etc.? Also, are there modern kits available for a super VLF metal ...

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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. The coil transmits a pulse toward the ground, generating an answering pulse from the target object. A sampling circuit measures the pulse and sends it to an integrator, which generates an ...

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Heathkit Diagrams, Schematics and Service Manuals - download for free! Including: heathkit 309 c rf probe, heathkit 336 hv probe, heathkit 337 c demodulator probe, heathkit 342 low capacity probe, heathkit 2006 technician, heathkit 2007 general, heathkit 2008 extra, heathkit a 7e amp schematic diagram, heathkit a 9a amp schematic diagram, heathkita9c, heathkit a 9c integrated amp schem ...

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Heathkit Vlf Locator Gd-1290 Model Groundtrack Metal (45.6% similar) . 99 and 15 shipping. Here are some of the specs sensitivity dime at 4 to 6 typical operating freq khz method of detection induction balanced circuit detector output meter I used it a lot, filling several cups with all kinds...(posted on May 25th, 2015) Gd-18 Pair Of Vintage Heathkit Pa Electronic Sirens (46% similar) Does ...

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23/08/2015  Differences between Heatkit GR-1290, GD-1190 and GD-1290. I am new to this forum Hope someone can clear up my confusion about the three Heathkit metal detector models, i.e. the GR-1290 the GD-1190 and the GD-1290? Does anyone know the difference, like operating frequency, etc.? Also, are there modern kits available for a super VLF metal ...

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Heathkit Groundtrack GR-1290 metal detector . Heathkit Groundtrack GR-1290 VLF metal detector. Fig. 1: Heathkit GR-1290 VLF metal detector schematic diagram . Parts list ICs: U1: CA3130S (BiMOS Operational Amplifier) U2, U3: LM308 (Precision operational amplifiers) U4: LM2901 (Quad Single Supply Comparator IC) Transistors:

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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. The coil transmits a pulse toward the ground, generating an answering pulse from the target object. A sampling circuit measures the pulse and sends it to an integrator, which generates an ...

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Proton am-300 vintage stereo amplifier with rc and original owners manual Vintage - heathkit gd-1290 groundtrack metal detector - as is - untested today 145... FS Heathkit Manuals 5 each plus shipping. The following Heathkit manuals are for sale at 5 each plus 175 for GD-1290 Groundtrack VLF Metal Locator Heathkit 4 Element tribander manual 5 shipped 2... heathkit metal detector manual pdf ...

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Heathkit Diagrams, Schematics and Service Manuals - download for free! Including: heathkit 309 c rf probe, heathkit 336 hv probe, heathkit 337 c demodulator probe, heathkit 342 low capacity probe, heathkit 2006 technician, heathkit 2007 general, heathkit 2008 extra, heathkit a 7e amp schematic diagram, heathkit a 9a amp schematic diagram, heathkita9c, heathkit a 9c integrated amp schem ...

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Heathkit Vlf Locator Gd-1290 Model Groundtrack Metal (45.6% similar) . 99 and 15 shipping. Here are some of the specs sensitivity dime at 4 to 6 typical operating freq khz method of detection induction balanced circuit detector output meter I used it a lot, filling several cups with all kinds...(posted on May 25th, 2015) Gd-18 Pair Of Vintage Heathkit Pa Electronic Sirens (46% similar) Does ...

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