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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

Who is the most simple PI detector circuit?

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Pendeen

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	Re: Who is the most simple PI detector circuit? « Reply #20 on: January 23, 2013, 04:52:38 pm »

A PI detector can discriminate if designed well. The magnetic field decay rate depends on the internal resistance of the metal/alloy concerned. The decay rate is different for each metal or alloy.

Detecting this decay depends on a fast enough sampling rate (higher rates consume the battery charge faster) to detect it accurately enough to discriminate.

Follow this thread to get the idea:

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http://www.geotech1.com/forums/showthread.php?12523-Universal-PI-Micro

I mention this because technology is improving all the time and sweeping generalisations can confuse people.

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Homefire

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	Re: Who is the most simple PI detector circuit? « Reply #21 on: January 23, 2013, 05:39:00 pm »

Make one! I've Never seen a PI with Discrimination.

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GoldDigger1950

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	Re: Who is the most simple PI detector circuit? « Reply #22 on: January 23, 2013, 06:03:57 pm »

	Quote:	Posted by homefire
Make one! I've Never seen a PI with Discrimination.

You own one. The Sea Hunter PI has discrimination.

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	Re: Who is the most simple PI detector circuit? « Reply #23 on: January 23, 2013, 06:38:13 pm »

That is Elimination Not Discrimination. LOL

First thing it does is Eliminate Gold.

It just shifts the Delay.

Everything below that setting is not detected.

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mikebg

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	Re: Who is the most simple PI detector circuit? « Reply #24 on: January 24, 2013, 05:04:56 am »

Pendeen,
There is more complicated project by Bugwhiskers:

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http://australianelectronicgoldprospectingforum.com/qed-micro-controlled-pi-detector-by-bugwhiskers/

Yhl,
There is the simplest PI project:

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http://www.geotech1.com/forums/showthread.php?19953-Simplest-PI-detector-possible&p=164785#post164785

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GoldDigger1950

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	Re: Who is the most simple PI detector circuit? « Reply #25 on: January 24, 2013, 08:15:05 am »

	Quote:	Posted by mikebg
There is more complicated project by Bugwhiskers: You are not allowed to view links. Please Register or Login http://australianelectronicgoldprospectingforum.com/qed-micro-controlled-pi-detector-by-bugwhiskers/

Mike, I tried to register there and the anti-spam test isn't working. If you would be so kind as to let them know, it would be appreciated.

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dr.jare

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	Re: Who is the most simple PI detector circuit? « Reply #26 on: January 24, 2013, 08:45:05 am »

I was registered there, but I get the following message:
"An Error Has Occurred!
The topic or board you are looking for appears to be either missing or off limits to you."

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	Re: Who is the most simple PI detector circuit? « Reply #27 on: January 27, 2013, 08:16:01 am »

There is many topics and links keep being posted about that mysterious qed detector. Never actual schematic or other info. Could someone post a real schematic about that, instead of just spam?

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	Re: Who is the most simple PI detector circuit? « Reply #28 on: January 27, 2013, 03:10:26 pm »

	Quote:	Posted by GoldDigger1950
Quote:Posted by mikebg There is more complicated project by Bugwhiskers: You are not allowed to view links. Please Register or Login http://australianelectronicgoldprospectingforum.com/qed-micro-controlled-pi-detector-by-bugwhiskers/ Mike, I tried to register there and the anti-spam test isn't working. If you would be so kind as to let them know, it would be appreciated.

I was able to do the Puzzal and get in after about three tries.

They take a while to conferm you active.

Site seems like little activity but I know a Pile of names on there and there all good folks on other sites.

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GoldDigger1950

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	Re: Who is the most simple PI detector circuit? « Reply #29 on: January 27, 2013, 05:34:22 pm »

What puzzle, Homefire? I don't even see that. All I get is a form to fill in and nothing more. Oh, two check boxes. Where is the puzzle?

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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.

Let's Talk Treasure!

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