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#276
08-21-2014, 06:59 PM
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in my field where i buried 30 coper coins in past months i try my pd then i take a further signal, then after i of new try my pd the signal dissapared i can understand those pd need a atmosferic conditions specifis for operation
en mi campo donde yo pruebo enterre 30 monedas de coobre, en pasados meses yo probe mi pd lrl entonces yo obtuve una fuerte señal, entonces despues de nuevo meses despues yo pruebo mi pd y la señal desaparecio, yo puedo entender que estas pd necesitan especificas condiciones atmosfericas para funcionar, tal vez aun las etapas de la luna les afecten, las alineaciones planetarias, el sol y la temporada del año 
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#277
08-26-2014, 03:00 PM
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Quote:
i have a question 
__________________
Knowledge is the greatest wealth
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#278
08-26-2014, 04:04 PM
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Hi Mustefa,
Now I'm in Italy, before I don't see your post. Yes the coil is 10mm diameter, long 10mm and 3 turns. The capacitor is 22pF but today I have used a variable capacitor 4-20pF and in the next day I go in my test field. perhaps I can discriminate gold... Best Regards
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#279
08-26-2014, 06:21 PM
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Quote:
__________________
Knowledge is the greatest wealth
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#281
08-30-2014, 10:39 AM
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#282
09-04-2014, 08:16 PM
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Some improvements
The coil L1 is better if it consists of 2 turns and for greater sensitivity you must shield the entire box with aluminum adhesive except the cover of the input stage, as seen from the photos. The shielding must be connected to the ground of the input circuit. The handle must be at least 20 cm long with a diameter of 4 cm or 5cm, also to have maximum sensitivity you must hold the handle with both hands. The best antenna is a stylus 80cm-100cm. With 30cm it has the minimum sensitivity, the greater the length the greater the sensitivity. With these changes, it is possible to detect targets that were previously ignored, such as, for example, short time metals buried (1 month or more) in your test field.
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#283
09-11-2014, 06:04 PM
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Congratulations Excellent.Why did you shield box? What was the material of the box?wood or plastic? If the box be made of wood, does need a shield? What is your opinion on fiber Pulygan?
__________________
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#284
09-12-2014, 11:13 AM
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Hi Mustefa,
The material is plastic and I think that any type is fine. By shielding the LRL is more sensitive with no false signals caused by the human body and, as I said, the higher sensitivity can make the difference in whether or not to reveal the buried metal used as a test. I do not know how does the wood, but you can try. Best Regards
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#285
09-12-2014, 11:55 AM
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Wood is hygroscopic and can easily change its properties.
Wood is not really suitable for such sensitive design, even impregnated and lacquered not.
__________________
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#286
09-12-2014, 12:30 PM
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Hi WM6,
I agree with you, wood is poor insulator and poor electrical conductor, but with the aluminum shield I think that you can use. I prefer to use plastic panels that I find with ease. Best regards
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#288
09-12-2014, 12:52 PM
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#289
09-12-2014, 03:44 PM
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HI brs,
This is my lrl? What is the coil in the upper side of the box? Best Regards
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#290
09-12-2014, 05:53 PM
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franco in your lrl with 8mhz frq and cap 22p The inductance L1 is about 180 Nanohenries ?true?
http://chemelec.com/Calculators/LC-Calculator.htm
__________________
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#294
09-13-2014, 12:28 PM
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Hi Mustefa,
these data are ok. Best Regards
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#295
09-13-2014, 12:34 PM
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Hi brs,
I will try the coil with 8 turns but with 3 turns and up to 100pF for the capacitor I had no results. Probably every country requires a particular frequency. Best Regards
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#296
09-13-2014, 04:52 PM
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Franco 4046
Hi Franco, this is my version of your LRL ,the one with the 4046.
First of all, I want to say a big thanks to you, for sharing these schematics. I don't know if these LRL actually working, but I strongly believe that you believe in these. And this matters, sharing with everyone in this forum, something personally precious. This ,at my opinion ,is the true spirit of collaboration in this forum. Thanks again. Bill
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#297
09-13-2014, 05:13 PM
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Hi Bill512,
Good work, I want to add that in this LRL can be added also the measure of the signal amplitude as in the LRL with quartz at 8MHz, in fact the amplifier is the same in the two cases. I have done this in a particular LRL to see if there were differences between the various metals by comparing measurements of phase and amplitude, but it seems that there is no difference. Regards
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#299
09-17-2014, 12:15 AM
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Quote:
while playing around with the FrancoPPL, I noticed that close to power sources or close to "potencial anomalies from buried metals", the Led goes off. The same happens in the voltage at pin 1 of the LM358. Is this normal? or maybe there is some mistake in my PCB? regards
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#300
09-17-2014, 07:26 AM
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Quote:
Hey Bill artist.... 
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Geo
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Linear Mode
