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Offline houseinTopic starter
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« on: July 05, 2009, 08:10:20 am »
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 Welcome
hi to all brothers
well  Smiley  i build snifeer xr71 Detecting
but i need to know hi i can use this circuit  Undecided
Possible to help me determine the value of a variable resistance in schema?? Pray
resistors varie (200kohm) and (trim 1 k ohm)??


and other varie resistors (220k ,10k.25k.25k,47k)??(and what is value puissance?)
 For example, what the result will be the value off  (47k ohm resistor)a min or max?
and what mode Battery
 and For the connections How can I do!!Between the varie   resistors?!
Please I need the information to be able to succeed in my work
 i would be grateful if you   help my Great
sory for my bad inglich  Wink
best regards

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Offline Eugene52
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« Reply #1 on: July 05, 2009, 08:36:21 am »
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Quote:Posted by housein
Welcome
hi to all brothers
well  Smiley  i build snifeer xr71 Detecting
but i need to know hi i can use this circuit  Undecided
Possible to help me determine the value of a variable resistance in schema?? Pray
resistors varie (200kohm) and (trim 1 k ohm)??


and other varie resistors (220k ,10k.25k.25k,47k)??(and what is value puissance?)
 For example, what the result will be the value off  (47k ohm resistor)a min or max?
and what mode Battery
 and For the connections How can I do!!Between the varie   resistors?!
Please I need the information to be able to succeed in my work
 i would be grateful if you   help my Great
sory for my bad inglich  Wink
best regards


Hello housein , which schematic are you using ? I think the resistor values on your picture have been changed . Are you using this schematic ? Let me find the correct xr-71 zip folder  that has everything needed for the project . Regards.........Eugene

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Offline Eugene52
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« Reply #2 on: July 05, 2009, 09:02:32 am »
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Hello again . This goes with the schematic.................Regards............Eugene

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« Last Edit: July 05, 2009, 09:12:10 am by Eugene52 »
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Offline houseinTopic starter
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« Reply #3 on: July 05, 2009, 12:37:07 pm »
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hi Eugene Welcome
thx  for your replay
well.this is projet i build
but is diffrent with  circuit!!  Shocked
my circuit is not correct? Sad
i get it from here     

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http://www.geotech1.com/forums/showthread.php?s=6224d884c3de082a27ad450a3444bf61&t=10999&page=2

my  last  schema it Modified
 so i can build it?

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Offline Eugene52
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« Reply #4 on: July 05, 2009, 10:52:32 pm »
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Quote:Posted by housein
hi Eugene Welcome
thx  for your replay
well.this is projet i build
but is diffrent with  circuit!!  Shocked
my circuit is not correct? Sad
i get it from here    

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http://www.geotech1.com/forums/showthread.php?s=6224d884c3de082a27ad450a3444bf61&t=10999&page=2

my  last  schema it Modified
 so i can build it?


Hello . The xr71 schematic I posted here a few months ago should be the same as yours and the latest final version . Build it and let us know your progress .
Best Regards....................Eugene

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« Last Edit: July 05, 2009, 10:59:22 pm by Eugene52 »
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Offline Eugene52
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« Reply #5 on: July 05, 2009, 11:06:58 pm »
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Hello .The 46.3 kb  pdf file-schematic done by Isis should be correct . But I will double check . Go ahead and start building it.......Regards......Eugene

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« Reply #6 on: July 06, 2009, 01:15:00 am »
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housein;

Can you post a circuit diagram, perhaps I can tell you.... Im supposed to be an electronic (gee)whiz.... ha!

Ive been dabbling and making a living in electronics since about  1952, I am a Ham and my call is VE7EQP..... I do find locator electronics interesting, too.

Brian AKA goldigger (finger snappen mit spitzen sparken, you know!)

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« Reply #7 on: July 06, 2009, 01:22:52 am »
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Housein;
Must apologize semi-profoundly.... I didnt see all this thread an pictures, at first, because my browser often goes to the bottom of the page.... Now, I have collected stuff, and will go digest it like a snake after eating a big rat! (ik)

Brian AKA gooldigger (shorted out!)

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Offline Eugene52
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« Reply #8 on: July 06, 2009, 07:40:14 am »
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Hello Housein . These 3 files I posted here go together and is everything you need !!! The search coil is easy to make ... Also , If you need a copy of the pcb software let me know and I will e-mail to you .
Regards..........Eugene

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« Reply #9 on: July 06, 2009, 08:13:22 am »
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eugene, this is ram a new member yet, im building the xr71 using your pcb attached in your post. can i used the mylar capacitors? w/c is only the available type in my town. im in the very remote town even the double sided pcb have no available, im using single sided board i make two boards then glue together my place is very poor. . .

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