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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Metal Detecting > Metal Detecting in General (Moderators: Bugar, Ridge Runner) >

Pin point probes

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gray.nomad Topic starter

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	Pin point probes « on: March 11, 2009, 09:16:33 pm »

Hi guys,
From your experience(s), what pin point probes will positively indicate small nuggets of about 0.3 grams at about 2.5 cm or 1 inch distance?

What type would such a probe be, i.e. a PI, VLF or other type?

Are there any circuit diagrams to build such a unit yourself or perhaps are there any kits available?

I am after such a device which will hopefully make nugget recovery a bit easier. Kiss

Best regards

Frank

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Bud

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	Re: Pin point probes « Reply #1 on: March 11, 2009, 09:42:33 pm »

Hey,

In 'Lost Treasure' Dec. 2008, Cris Gholson (master prospector) has an article testing Garrett's Pro Pointer. He used it to pinpoint nuggets down to 0.2 grams; did not say distance from nugget. He said it was "incredibly useful for prospecting". He also said "other than not being able to turn off the LED and vibrate alarms, I have nothing but praise for the new Garrett product".

Bud

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gray.nomad Topic starter

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	Re: Pin point probes « Reply #2 on: March 12, 2009, 01:15:03 am »

Thanks Bud

Best regards
Frank

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Paul A

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	Re: Pin point probes « Reply #3 on: March 12, 2009, 03:56:15 am »

Hi,
I have one of the Whites "bullseye" probes.
I tried a test with it on a tiny piece of gold from an earring (i would guess about .5 of a gram)
The best it could do was about a quarter of an inch.
The big problem I could see is that all probes seem to detect for some way along the probe itself as well as at the end (About 2 inches).
So using it in a hole for something that small could be a bit of a nightmare.
I have heard that the Garrett probes are really good though!
Theres a thing called the "Uniprobe" that looks like it might suit your purposes.
A headphone based P.I. probe that can be converted to a full P.I. detector by just plugging in the appropriate coil........ bit expensive though!

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http://www.akmining.com/mine/detectorpro_uniprobe.htm

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Bud

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	Re: Pin point probes « Reply #4 on: March 12, 2009, 01:37:56 pm »

If you can stand the price ($350 @ Kellyco) the Uniprobe would be top contender. It is headphone based; flip a switch and go from detector to probe. The depth on this thing is phenominal, 5+ inches. If I didn't have Sunray probes on both my Explorers I would definitely be looking hard at a Uniprobe.

Bud

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Cornelius

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	Re: Pin point probes « Reply #5 on: March 12, 2009, 03:10:22 pm »

Paul that $350 unit is nothing more than a regular PI detector with a ferrite rod coil ( ferrite rod coil about $10 ) . The PI detector in the head phone is just a small PI detector which should work with a regular coil . Instead of the regular coil they now connected a ferrite rod coil . Somwhere on this forum I have posted a schematic of this ferrite rod coil . By changing the amount of windings you can make this coil work on your PI detector . Cornelius

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	Re: Pin point probes « Reply #6 on: March 12, 2009, 03:22:56 pm »

Awesome Cornelius. I always like to see and hear your knowledge. I am catching up on your posts.

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gray.nomad Topic starter

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	Re: Pin point probes « Reply #7 on: March 12, 2009, 09:16:19 pm »

Thanks Cornelius,
Good info. I'd like to download this info, but since I am a new member, I am not allowed until I have at least 15 postings. Undecided

I had been thinking of using "Gary's" of Chemelec PI system but it's a bit unstable, therefore I had in mind to use a ferrite core, rather than air core.
Your comments confirmed my toughts. Thank you for your valuable input.
Best regards from Down Under.
Frank

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Paul A

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	Re: Pin point probes « Reply #8 on: March 13, 2009, 09:44:11 am »

Hi Frank,
I built the "EE Pi" detector.
It's available as a kit in the u.k. from Magenta Electronics for about ?65.
Very good little detector.
I'm about to wind the ferrite probe for it (Thanks Cornelius!) - I'll let you know how I get on.

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Cornelius

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	Re: Pin point probes « Reply #9 on: March 13, 2009, 10:19:08 am »

Paul in case you are forgetting , you can use a solid ferrite rod ( the hollow rods are not easy to get ) . A rod out of an old radio ( antenna ) would work . Insulate the rod with tape and start winding one layer only . The winding have to be put on in a manner that you will have the best signal ( you have to do this by trial ) After you have the right result , insulate the windings with another layer of tape . Cornelius

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