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Offline yhlTopic starter
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« on: February 06, 2011, 04:15:13 am »
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Who is the most simple PI detector circuit?


Posted on: February 06, 2011, 03:47:06 AM
need to find a simple PI detector circuit.


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Offline RMILLER66
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Whies,Minelab
« Reply #1 on: February 06, 2011, 04:24:12 am »
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Whites and Minelab have Mastered the PI circuit.

I would start there and see where they have gone from there.

That should take you where you want to be.

JP



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Offline mikebg
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« Reply #2 on: June 15, 2011, 01:34:02 am »
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Dear Yhl (or Mr. Yue Hailin from China Jiangxi Nanchang).
You made the circuit diagram shown in left - project of Gary Chemelec. Please describe in the forum your results and what coil assembly you have tested.
However pass  the posting trough a spelling check program because for me is dificult to understand Chinese English. Smiley

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Offline japanese
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GARY PI
« Reply #3 on: June 15, 2011, 09:01:50 am »
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Hi mikebg
  The first project is gary, The second one is an clon from proscan project


For me,gary it was an ongoing project of educational projects completed that depend on 555 and adoption of the direct way is to get a lot of experiences doing this project at the same time  I feel that it gives very good results.

best time
j.

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Offline homefire
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« Reply #4 on: June 15, 2011, 09:59:39 am »
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I think the Bare Bones and best would be the Surf PI.

And you can obtain a Really Good Kit for Cheap!

Check out Silverdogs store.



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« Last Edit: June 15, 2011, 10:01:28 am by homefire »
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Offline dr.jare
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« Reply #5 on: June 15, 2011, 01:58:38 pm »
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Barracuda is better ...  But our friend yhl wants: a simple metal detector with good discrimination and with good sensitivity to coins (more than 25cm).

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Offline homefire
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« Reply #6 on: June 15, 2011, 02:16:05 pm »
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No Such thing as a PI with Discrimation.




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Offline Gold24K
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« Reply #7 on: June 15, 2011, 09:00:37 pm »
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This is good PI in general. Not tuned for small gold though. I can detect a 1 ounce gold coin in air at 3 feet with mine. It has a 15 inch coil.
Gold24k


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Offline GoldDigger1950
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« Reply #8 on: June 16, 2011, 02:32:59 am »
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Quote:Posted by homefire
No Such thing as a PI with Discrimation.

Fortunately, there are a couple with discrimination though.

It's difficult to do because the decay return of the pulse must be analyzed quite rigorously and it's just not that easy to pick out the differences. My Sea Hunter has it but I don't use it. Since I dig everything, using it would have me accidentally eliminating things I want to see come to me.

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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!

Offline dr.jare
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« Reply #9 on: June 16, 2011, 01:32:06 pm »
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Discrimination is not 100% sure (even in the VLF) in the whole of its depth. It is best to dig every signal, because who knows what can be missed ...

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