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Offline steaua581
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« Reply #240 on: March 03, 2010, 06:24:57 am »
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Guys i have a question regarding the pcb layout posted originally by Eugene....and i have atached the to files wich i cant match.Can someone give me the right schematic and .lay file please.
Meaby i have mixed them up a little....
can someone give me the right succesfull no bugs project...part list if possible...and so on send it to my  email please ...
Greatfully appreciated
Marius
atlanta24marius@yahoo.com


"Well i tryied to upload the RAR file but it does not upload"

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« Last Edit: December 31, 1969, 06:00:00 pm by steaua581 »
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« Reply #241 on: March 03, 2010, 06:38:33 am »
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Quote:Posted by steaua581
Guys i have a question regarding the pcb layout posted originally by Eugene....and i have atached the to files wich i cant match.Can someone give me the right schematic and .lay file please.
Meaby i have mixed them up a little....
can someone give me the right succesfull no bugs project...part list if possible...and so on send it to my  email please ...
Greatfully appreciated
Marius
atlanta24marius@yahoo.com


"Well i tryied to upload the RAR file but it does not upload"
8 more posts..and you can download it at download secion here

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Offline steaua581
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« Reply #242 on: March 03, 2010, 06:45:49 am »
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well i have allready downloaded some files you mean they wherre not the right ones?

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Offline NIKOS
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« Reply #243 on: March 03, 2010, 12:26:25 pm »
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Quote:Posted by mafarid
Yes, LF357 was warm a little! But why?  Shocked Shocked Shocked
I think warming of LF357 is not normal. Huh?
 I do not have another LF357 to replace, so is it passable for anyone who has ready DP test this problem?

i find samthing hu maby help you
diametr of coil wire  voltaz   resistansOm          100cm long
0.40                       314mA     0.1422om
0.42                       346mA     0.129  om
0.45                       400mA     0.11236 om
0.48                       450mA     0.0986 om
0.50                       490mA     0.091  om
0.55                       594mA     0.0752 om

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« Reply #244 on: March 05, 2010, 02:28:40 am »
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Hello ram

Wich one is better frequency for find gold , 100 HZ  , 120 Hz , 250 Hz , 300 Hz  ?

Thanks ....

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« Last Edit: December 31, 1969, 06:00:00 pm by belief »
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« Reply #245 on: March 06, 2010, 01:26:47 pm »
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My circuit is also didn't work in single layer board at all. after this, I'll not spend money on such circuits. I think, I've spent more money than one available and constructed metal detector in market.  Angry

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« Last Edit: December 31, 1969, 06:00:00 pm by hesamavr »
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Offline NIKOS
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« Reply #246 on: March 08, 2010, 03:03:30 am »
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is the pcb same with the schematic ?
is ole resistors +_1%  ?
is ole capacitors poliester film?
is ole solder rite ?
is the coil resistans 3.5-4.5 Om
is evrything in rite place?
have you test the stadium [5volt stabiliser-orcillator-amplifier-]?


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Offline hesamavr
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« Reply #247 on: March 08, 2010, 05:47:24 am »
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The resistance of coil is about 2.5 to 2.6 Ohm, and everything is in its right place.

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« Reply #248 on: March 08, 2010, 08:09:14 am »
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Hi
Dear NIKOS:
Is the PCB same with the schematic?
Not completely, but parts that deleted from PCB is not so important because more and more people was build this circuit and some of them succeed.
Is ole resistors +_1%?
No, except of four resistors that pointed on schematic for other resistors 1% tolerance is not needful.
Is ole capacitors poliester film?
Yes
Is ole solder rite?
Yes
Is the coil resistance 3.5-4.5 Om?
No, It is passable that problem is in here!
Thank you. I refer to American wire gauge page (

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) and find that standard resistance of coil should be 3.5 ohm.
Is everything in rite place?
Yes
Have you test the stadium [5volt stabiliser-orcillator-amplifier-]?
Yes, if you purpose is right voltage on supply pin my answer is yes but if your purpose is true signal on output pin of OP amp my answer is no
 At end I have a question from you, Are you complete this DP and it worked?


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Offline NIKOS
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« Reply #249 on: March 08, 2010, 09:32:00 am »
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NO i am not even started  Rider sory for too many qestions   Violent
i working my GOLD-SCAN 
Quote:Posted by NIKOS
i find samthing hu maby help you
diametr of coil wire  voltaz   resistansOm          100cm long
0.40                       314mA     0.1422om
0.42                       346mA     0.129  om
0.45                       400mA     0.11236 om
0.48                       450mA     0.0986 om
0.50                       490mA     0.091  om
0.55                       594mA     0.0752 om
for the lf357 the coil have end sam capasistans end if this capasistans is low
parts like the lf357 get warm ,,thanks

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