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Offline ramTopic starter
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« Reply #120 on: February 12, 2011, 08:27:01 am »
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delta pulse is deeper, if you use it for small targets and not so deep ex.coin hunting try small coil and higher frequency and adjst sampling delay. gold is detectable by metal detector.gold is metal it induces eddy current. pi md should be adjusted for their purposes.


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« Reply #121 on: February 12, 2011, 03:07:44 pm »
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hi ram thanks to your information
but how can i adjust the device to detect gold only
or to detect gold and any thing else
look i dont know if you listen about the turkish gold in midel east there are signs and no map so you should serch hard to detect it
and each box is about aproximetly 50kg of 21quirat gold coins
so is this quentity detectable on distance from 1m to 1.5m by a homemade md


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Offline ramTopic starter
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« Reply #122 on: February 13, 2011, 02:17:18 pm »
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Quote:Posted by danny475
but how can i adjust the device to detect gold only
or to detect gold and any thing else
look i dont know if you listen about the turkish gold in midel east there are signs and no map so you should serch hard to detect it
and each box is about aproximetly 50kg of 21quirat gold coins
so is this quentity detectable on distance from 1m to 1.5m by a homemade md


keep in mind, there were no metal detector that can detect only gold.  50 kilo gram box with gold coins is a big target enough for 1x1 mtr coil of delta pulse to detect at 1-2 meter deep on the ground. just try to airtest for maximum adjustment for that target simulate it for actual search.

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« Reply #123 on: February 24, 2011, 04:05:35 am »
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Hi ram Waveing
Thanks for your advise  Pray
My fault was in PIC programming. No no!
It work normally now But i cant find NE5534in my place .I replace it whit TL071 but it cant sense anything and r10(680 ohm) go overheating  .
You're right, TL071 not work. Round About
What is your suggest ?

Regards

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Offline ramTopic starter
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« Reply #124 on: February 24, 2011, 07:38:22 am »
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Quote:Posted by freedan3d
You're right, TL071 not work.
What is your suggest ?


it should ne5534, but just try to search the replacement of ne5534 on the net.

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Offline GoldDigger1950
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« Reply #125 on: February 24, 2011, 03:34:48 pm »
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Quote:Posted by ram
it should ne5534, but just try to search the replacement of ne5534 on the net.

The trouble with finding a sub for the NE5534 is that the device is a substitute manufactured to replace a multitude of devices, not just one. In other words, there is no substitute for that device. It is, itself, a substitute.

You can order one worldwide right here for under $1.00.

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http://www.futurlec.com/Linear/NE5534.shtml


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« Last Edit: February 27, 2011, 07:05:01 pm by GoldDigger1950 » 		Logged
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« Reply #126 on: February 27, 2011, 01:08:04 pm »
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Hi ram
I found Ne5534 and it work now. Clapp
It sense all metal such as iron , gold ,silver  Shocked
But it's r10 still overheating  No no!
Is it  1/4 watt resistance?

This MD have 2 bar B1 and B2 on LCD , is it a discriminator MD? Huh?

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Offline ramTopic starter
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« Reply #127 on: March 01, 2011, 08:12:20 pm »
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Quote:Posted by freedan3d
Hi ram
I found Ne5534 and it work now.
It sense all metal such as iron , gold ,silver  
But it's r10 still overheating 
Is it  1/4 watt resistance?

This MD have 2 bar B1 and B2 on LCD , is it a discriminator MD?



R10-680 ohm 1watt
try to eliminate the R4 and D1- i have good result on my PIM1 circuit but i'm not convinced to this circuit. i am planning to eliminate the pic and replaced it with other more stable circuit. i have to consult the wiz on this forum.

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« Reply #128 on: April 16, 2011, 11:21:19 am »
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hi i am a new meber in this forum and i fint it very intresting .thanks for all this informasions.

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Offline tasosptol
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« Reply #129 on: April 19, 2011, 11:23:01 am »
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thank you  from greece - great job

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