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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > VLF Designs (Moderator: Eugene52) >

Bayindir Turkey VLF detector part 4

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pamungkasdigdaya

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Pulse Induction

	Re: Bayindir Turkey VLF detector part 4 « Reply #10 on: June 02, 2011, 02:46:32 am »

Yes correct RF shielding is considered for the design, but it is not easy for rebuild it, or even troubleshooting, whenever the system get problem.

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errol

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	Re: Bayindir Turkey VLF detector part 4 « Reply #11 on: June 02, 2011, 03:20:14 pm »

only copy protection.. :)no RF shield..

makes it lives in a town in my country. custom producer..

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Eugene52

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Teknetics , Fisher , Discovery3300 and TIANXUN 19 kHz VLF Metal Detector

	Re: Bayindir Turkey VLF detector part 4 « Reply #12 on: June 02, 2011, 04:48:48 pm »

From Great Painter [also technician] Pablo Picasso !!

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galaksi Topic starter

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	Re: Bayindir Turkey VLF detector part 4 « Reply #13 on: June 03, 2011, 12:35:05 am »

Best wishes from Pablo Picasso

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galaksi Topic starter

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	Re: Bayindir Turkey VLF detector part 4 « Reply #14 on: June 03, 2011, 05:00:54 am »

coil dimensions. .
could not measure inductance.

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	Re: Bayindir Turkey VLF detector part 4 « Reply #15 on: June 03, 2011, 08:14:19 am »

	Quote:	Posted by galaksi
coil dimensions. . could not measure inductance.

Also important is frequency , then measure each DC resistance of the [tx]transmit and [rx]receive coils .
Then check the capacitance values on the circuit board , oscillator , input etc. Then do your resonance formulas on paper . A lot you can do on paper if you do not have LC meter .
Best Regards to you Galaksi

HH.............Eugene

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galaksi Topic starter

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	Re: Bayindir Turkey VLF detector part 4 « Reply #16 on: June 04, 2011, 05:12:18 am »

circuit diagram of a section
home-made measuring instruments:

on the search coil
Rx C=6nF
L=12,2 mH
f=18599 Hz

Tx C=100nF+47nF+5n6=153 nF
L=1,024 mH
f=12717 Hz

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Eugene52

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	Re: Bayindir Turkey VLF detector part 4 « Reply #17 on: June 04, 2011, 09:37:56 am »

Excellent Work Galaksi !! That circuit looks like it was from old Elektor Magazine Project . Also similar done at Russian site .
I am researching old articles now . Best Regards

HH......... Great

.......Eugene

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galaksi Topic starter

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	Re: Bayindir Turkey VLF detector part 4 « Reply #18 on: June 04, 2011, 06:12:24 pm »

Elektor Magazine Project 1980's

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	Re: Bayindir Turkey VLF detector part 4 « Reply #19 on: June 05, 2011, 02:21:47 am »

That cct board and soldering is absolutely amazing.Would love to see photos of the whole competed unit.

Regards

DJP

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