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Offline carmelosucchiTopic starter
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« on: November 29, 2010, 07:19:29 am »
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Hello every body.
Is there new pinponter project ? Of course with pcb.
I want start with home made building of pinpointer, if it will work good, after i want build a metal detector.
Thanks.
Carmelo

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Offline xavier
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« Reply #1 on: November 29, 2010, 11:22:26 am »
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A pin-pointer is a metal detector you can build the one from Silverdog just do a search for Surf PI if you don't find it let us know

Regards Xavier

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Xavier

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So many questions so little time
Offline GoldDigger1950
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« Reply #2 on: November 30, 2010, 01:45:48 am »
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Try this one. I haven't built it but the author claims it's a humdinger.

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http://www3.telus.net/chemelec/Projects/Metal-Pin/M-Pin.htm


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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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Offline jamjars
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« Reply #3 on: November 30, 2010, 02:46:36 am »
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That is a great link, thanks GD


 Smiley

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Offline GoldDigger1950
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« Reply #4 on: November 30, 2010, 02:52:13 am »
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You're welcome JJ. I can't go there often. I get SOOOOOO distracted on his site. I can wander around there for hours.

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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 jamjars
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« Reply #5 on: November 30, 2010, 02:56:19 am »
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i can see that, i bookmarked it for tonight and moved on  Grin

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Offline Paul A
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« Reply #6 on: November 30, 2010, 02:57:20 am »
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Hi Gd,
I built this one (on breadbord).
It's o.k. but like all these designs using 2 coils its more sensitive "side on" rather than at the tip....... which isn't really what you want.
Much prefer the "P.I." approach using a single coil which seems to "focus" better.
If you go with Silverdogs surf p.i. you've got the best of both worlds.
Hell, you dont even need to wind a pinpointer coil.
If you get a ferrite with an A.M. coil already on there the inductance of the coil is as close as makes no difference.
When I get a chance I'll do a step by step with photo's for everyone and post it.



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Offline GoldDigger1950
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« Reply #7 on: November 30, 2010, 03:14:20 am »
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Quote:Posted by jamjars
i can see that, i bookmarked it for tonight and moved on  Grin

Smart man. Smart, indeed.

Posted on: November 30, 2010, 11:11:19 AM
Quote:Posted by Paul A
If you get a ferrite with an A.M. coil already on there the inductance of the coil is as close as makes no difference.
When I get a chance I'll do a step by step with photo's for everyone and post it.

Ferrite antennas generally have two coils which are different. Do you use both?

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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 Paul A
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« Reply #8 on: November 30, 2010, 03:44:13 am »
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Hi GD,
No, for the P.I. just use the A.M. section, the inductance is pretty damn close to use on the surf p.i.
It's 370uh (you could take some windings off I guess.... but I didn't bother).
The ferrite I used did, indeed come with 2 coils A.M. and longwave... just discard the longwave coil (it's 4mh).
Here's a link that'll likely make things clearer...

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http://www.maplin.co.uk/Module.aspx?ModuleNo=859


If you want one (although it's showing out of stock our local store have a couple) I can get one and post it for you..... let me know.




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Offline GoldDigger1950
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« Reply #9 on: November 30, 2010, 06:13:00 am »
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I'll give that a miss because I already have a 350uh ferrite core coil that will do the job. Thanks anyway.

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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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