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Offline levettpTopic starter
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« on: September 18, 2010, 09:17:27 am »
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Hi everyone

I'm Levett from South Africa

I am busy with the development of a PI gold detector and would like to exchange knowledge with people that have the same interest

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Om te MEET is om te WEET
Offline Sue
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« Reply #1 on: September 18, 2010, 09:27:23 am »
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Hi Levett and good luck with your gold detector! Welcome aboard! Sue

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Offline Derick
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« Reply #2 on: September 18, 2010, 09:45:22 am »
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Good luck and keep us posted

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Offline seldom
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« Reply #3 on: September 18, 2010, 10:46:24 am »
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Welcome from Texas

Seldom

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If you believe everything you read you are reading to much.
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Offline BitburgAggie_7377
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« Reply #4 on: September 18, 2010, 10:49:24 am »
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Hi, levettp.   Welcome to THunting.com.   Sounds to me like you'll be spending a lot of time on our Technical boards.

BA in Arizona

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Offline Homefire
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« Reply #5 on: September 18, 2010, 04:44:00 pm »
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Welcome from New Mexico

You need to look at or for a PI circuit that is Stable, Quiet (From External RFI), and can pull a Sample Signal 7 to 10 us behind the TX shut off.  This is were the Gold Lives in the Time Domain.


There are a few good circuits for this in the Down Load section.

I my self have been playing with the old Garrett Sea Hunter XL500.  Original Sample time started at something like 40us and with the Replacement of one resister you can bring it down to 7us.

The XL200 version is the same circuit board and comes with a Sheilded Coil if you can find one.

Stability of this unit Sucks as it has a Unshielded Coil.

Some day when I am Rich and Famous, I'll build a new coil and run a ground line to the 0 Volts Ground.

Another good one to look at is the Whites Surf Master Schematic.

There is a PCB available for this one if you act fast.






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Offline levettpTopic starter
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« Reply #6 on: September 19, 2010, 01:15:32 am »
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Thank you everyone
Thanks for your advice. At this stage my main concern is over voltage protection (OVP) of the amplifier circuit. I am going to experiment with coil designs and will use high voltage & current for tests. I have seen some OVP concepts on the MAXIM website but not sure which is the most robust.

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« Reply #7 on: September 19, 2010, 08:33:11 pm »
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welcome from Tennessee Detecting   
TTH

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« Reply #8 on: September 20, 2010, 09:37:54 am »
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chicago saying hey!!!!!!!!!!!!!!! Hello

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« Reply #9 on: September 21, 2010, 04:49:43 am »
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Welcome from sunny Australia! Spring has sprung down under and we're loving it.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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