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#2
10-24-2011, 01:34 PM
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Hi mesy
If you need better directivity, then use ferrite coil. Coil have to be tuned (L+C) to your local VLF transmitter frequency. If you tune coil to non-existend frequency in your local, you cannot detect nothing. 62 kHz maybe work in Paraguay but not everywhere else. Of course better to build with changeable antenna circiuts (L1+C1) or switch between different C as in AL718. And it is a mistake in schematic: [preamp] is not only "preamp" but "OSC" (oscillator stage) too. Most important parts for proper functionality. As preamplifier is here used audio head preamplifier in cassete recorder. Here proper housing for this LRL device: and here posible solution for such "preamp" (you chose between CP1 and CP2 to connect to you cass. recorder - according lower noise and other disturbances):
__________________
Global capital is ruining your life? You have right to self-defence! 
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#3
10-24-2011, 05:10 PM
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tank you wm6
I want an amplifier and pre amplifier and a Tesla coil to detect metals such as coins, which are below the soil It is possible that instead of ferrite in the circuit design of the coil Esteban easy to use? Do you like Esteban Th Tesla coil, but I submit that the schematic that I can detect metals in the soil?(gold) please help me tank you
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#4
10-24-2011, 05:31 PM
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Quote:
Why are you afraid of ferrite coil?
__________________
Global capital is ruining your life? You have right to self-defence!
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#5
10-24-2011, 06:40 PM
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Quote:
if receiver is running at 60Khz (LF) range you can get time signals from e.g. NIST see here http://en.wikipedia.org/wiki/WWVB BUT you have to be at max 2000Km from Fort Collins, CO, USA otherwise you must rely on other transmitter... but Esteban NEVER confirmed he's looking for time signals, though I asked him a number of times during testing of that PD gizmo 
__________________
"Kill for gain or shoot to maim... But we dont need a reason " someone said...
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#6
10-24-2011, 07:27 PM
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Quote:
This frequency might get a few feet penetration into the ground to be used like geologists use VLF for finding ground anomalies. But you will find deeper penetration with lower frequencies like 10-30 KHz. Best wishes, J_P
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#7
10-25-2011, 08:13 PM
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tank you wm6 and other freinds
I'm interested in building a project similar lrl Esteban Or with Tesla coils or ferrite. No matter dear wm6 You like to help me and a schematic design is practical, and Esteban with the ferrite to give? I'm interested in such projects.  please help me
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#8
10-25-2011, 08:30 PM
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Quote:
None of the electronic engineers here have found a VLF circuit that is practical for finding small buried treasures at long distance. The VLF circuits I see published here are practical only for making VLF surveys as a geologist does. I have never seen convincing evidence that any of the VLF circuits published in this forum are recovering anything for a treasure hunter. The exception is the PD which Morgan shows beeping 2 meters distance from a gold medal. But I do not see the circuit for this PD posted here. So I can not tell you any practical circuit for treasure hunting. The VLF circuits I see here are good for spending many hours in the field and surveying large areas of ground to look for hot spots and cold spots. This is how geologists use VLF receiver circuits. The best circuits I have seen for locating treasure at long distance is when people make modifications to make these VLF machines more sensitive to smaller metal things. But I do not see any detailed instructions how to make these modifications. I see only some hints. So I tell you there is no practical circuit that I have found in this forum for long range treasure hunting. Only talk and theories and some VLF designs that are modified to work better for small objects without details that show how to make them work. Best wishes, J_P
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