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  #1601  
Old 06-03-2017, 04:20 PM
fear009 fear009 is offline
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Quote:
Originally Posted by FrancoItaly View Post
the schematic for power stage is in "Power display stage (1 led)" and the display stage is in
"displayStage(3 led)".

Regards
ok.thanks mr franco
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  #1602  
Old 06-29-2017, 09:25 PM
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stergeol stergeol is offline
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How we regulate it if it goes north ;
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  #1603  
Old 06-30-2017, 10:42 AM
FrancoItaly FrancoItaly is offline
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I don't understand what you mean, if vou mean the compass effect, you must reduce the DC gain.
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  #1604  
Old 06-30-2017, 08:15 PM
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stergeol stergeol is offline
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Yes the compass effect .. DC gain in TR5 transistor ;
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  #1605  
Old 06-30-2017, 08:22 PM
abdou2014 abdou2014 is offline
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the DC Gain in display stage , P2 and R2 .
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  #1606  
Old 07-16-2017, 12:40 PM
liudengyuand liudengyuand is offline
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Has anyone succeeded?
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  #1607  
Old 07-31-2017, 06:04 PM
havoc88 havoc88 is offline
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Default Hello there

Excuse me friends. Is this CD4046 PCB "working" or not ? I've tried this part overlay with no luck.
Are the parts in the right order or not ? If it's working which is the pin or part that I can take an output for LM3917 VU meter ?

Thanks in advance !
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  #1608  
Old 08-01-2017, 11:22 AM
FrancoItaly FrancoItaly is offline
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I have not tried this PCB so I can not give any judgments. My advice is to make the sensor stage on a separate PCB and fine-tune it. Then you can add the other stages. I attach here the original PCB I used in all models and I suggest to make it double-faced, with the bottom face attached to the ground. This prevents oscillations.

Best Regards
Attached Images
File Type: pdf 8mhz -quartz lrl.pdf (287.9 KB, 297 views)
File Type: pdf pcb.PDF (78.4 KB, 264 views)
File Type: pdf CompPcb.pdf (254.6 KB, 291 views)
Attached Files
File Type: txt Helps.txt (3.3 KB, 118 views)
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  #1609  
Old 08-04-2017, 10:53 AM
havoc88 havoc88 is offline
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Thank you Franco for your time plus your work!!
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  #1610  
Old 08-05-2017, 07:38 PM
Milad.salsa Milad.salsa is offline
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hi franco very tnx for publish your project .
i have a queistion,can your circuit sense a metal in 2meter or more under ground???(depth)
because i sense metel in 60cm or less
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  #1611  
Old 08-06-2017, 10:59 AM
FrancoItaly FrancoItaly is offline
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The operating principle of lrls is that a metal (non-ferrous) buried for some time emits a kind of signal (which we call "phenomenon") that can be revealed to dozens of meters away and (I suppose) to several meters of depth . The greater the burial time the greater the distance and depth to which it can be revealed. I think a 200 or 300-year-old buried metal can be revealed by a lrl to a few meters in depth, but I think the depth also depends on other causes, such as terrain and maybe even atmospheric conditions. The phenomenon can also be revealed to about 2 meters above the ground.
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  #1612  
Old 08-06-2017, 06:26 PM
Milad.salsa Milad.salsa is offline
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thank you franco you are a great man.i test your circuit in a place that mw wave was very low and your circuit dont worked then i test it in a place with mw wave and your circuit worked very good.now this circuit work by radio wave?
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  #1613  
Old 08-06-2017, 09:25 PM
Hadi Hadi is offline
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Quote:
Originally Posted by FrancoItaly View Post
The operating principle of lrls is that a metal (non-ferrous) buried for some time emits a kind of signal (which we call "phenomenon") that can be revealed to dozens of meters away and (I suppose) to several meters of depth . The greater the burial time the greater the distance and depth to which it can be revealed. I think a 200 or 300-year-old buried metal can be revealed by a lrl to a few meters in depth, but I think the depth also depends on other causes, such as terrain and maybe even atmospheric conditions. The phenomenon can also be revealed to about 2 meters above the ground.
Hi dear Franco
For long time buried your system can be revealed metal about 20 meters.
Thanks
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  #1614  
Old 08-07-2017, 10:58 AM
FrancoItaly FrancoItaly is offline
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Quote:
Originally Posted by Milad.salsa View Post
thank you franco you are a great man.i test your circuit in a place that mw wave was very low and your circuit dont worked then i test it in a place with mw wave and your circuit worked very good.now this circuit work by radio wave?
Hi Milad.salsa,

What do you mean by mw wave? Surely the input circuit is tuned around 100Mhz, fm range. It's interesting to know the frequency you've noticed.

Best Regards
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  #1615  
Old 08-07-2017, 11:02 AM
FrancoItaly FrancoItaly is offline
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Quote:
Originally Posted by Hadi View Post
Hi dear Franco
For long time buried your system can be revealed metal about 20 meters.
Thanks
Hi Hadi,

You mean you found a metal 20 meters away?

Best Regards
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  #1616  
Old 08-07-2017, 08:33 PM
Hadi Hadi is offline
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Quote:
Originally Posted by FrancoItaly View Post
Hi Hadi,

You mean you found a metal 20 meters away?

Best Regards
The system is available to doing this performance.

B.R
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  #1617  
Old 08-11-2017, 09:18 PM
kaligula kaligula is offline
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Quote:
Originally Posted by payam20 View Post
here my pcb files
its 2bl side ( one side as franco said ground )
i put each component where to have the least effect to other one . becuase of its ground it have to much low noise .
what do you think dear franco . need any changes ??
sry for my english Untitled.jpg
This pcb has error at first sight, 7812 is shorted
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  #1618  
Old 08-11-2017, 09:29 PM
kaligula kaligula is offline
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Quote:
Originally Posted by pigeon View Post
NICE JOB
Where I can found this display pcb layout
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  #1619  
Old 08-11-2017, 11:27 PM
kaligula kaligula is offline
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Quote:
Originally Posted by kaligula View Post
This pcb has error at first sight, 7812 is shorted
Its OK, I found corected pcb
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  #1620  
Old 08-12-2017, 03:14 AM
ford ford is offline
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Default p1&p2

Can I use p1=20k and p2=500k in 3led display stage ?
I haven't 22k&470k potentiometer.
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  #1621  
Old 08-12-2017, 07:00 AM
kaligula kaligula is offline
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Quote:
Originally Posted by ford View Post
Can I use p1=20k and p2=500k in 3led display stage ?
I haven't 22k&470k potentiometer.
I think it's ok, it's not a big difference
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  #1622  
Old 08-12-2017, 07:02 AM
kaligula kaligula is offline
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Does anyone have made it with this pcb?
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File Type: pdf pcb (2).pdf (244.9 KB, 280 views)
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  #1623  
Old 08-12-2017, 01:04 PM
ford ford is offline
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When I touch antenna, led turn on and voltage increase!
What is problem?
Output voltage is between 5 V and 6 V.
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  #1624  
Old 08-12-2017, 04:09 PM
FrancoItaly FrancoItaly is offline
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Sometimes it has also happened to me, the test simply serves to determine if, by touching the input, there is some change in output. This way we are sure that no stage is in saturation or inhibition. The only reliable test is with a metal that has been buried for some time.

Best Regards
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  #1625  
Old 08-12-2017, 08:24 PM
ford ford is offline
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Thanks Franco

Can it detect buried metal pipes?

I tested it but I can't detect any thing!

I'm sure that there is very buried metal in our places

Best Regards
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