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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) >

Beginner would like to build Sandbanks PI Metal Detector

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ramchip

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #310 on: May 05, 2010, 06:13:23 AM »

Hello forum readers,
Coincidentally, I would like to build the Sandbanks metal detector too! It appears that the design was very good for its time and it has certainly generated a lot of interest in this forum.
I have the original magazine from Jan. 1979 but not the revisions that were published in the April and August issues.
According to the rules of thunting.com I need to make another four posts before I am allowed to download the
corrected schematics.
Does anyone have the April and August 1979 issues of Practical Wireless that could be scanned and supplied as a PDF?
I like to have access to original documentation whenever possible. Was the Toko part (T1) removed in either of these later issues?

Regards, ramchip

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homefire

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #311 on: May 05, 2010, 06:55:15 AM »

Welcome to the Forum.

You can down load any links within the post. Great

Like this one!

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There are 1 attachment(s) in this post which you can not view or download Please register for viewing them. sandbanks150[1].pdf
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ramchip

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #312 on: May 05, 2010, 07:56:59 AM »

Thank you Homefire, that was great! I see there are missing tabs before the quantity in the parts list but that's okay. Follow-ups #1 and 2 are there, which is the main thing.

Did you make the original when it was current? If not, how did you deal with the T1 problem?
I think that part might be obsolete, but I've not checked yet. I saw the document about winding your own T1 coil and may have to try that if I can't source T1. Thanks again for your generous help.

Regards, ramchip

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Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #313 on: May 05, 2010, 07:59:41 AM »

If you cannot get T1 , replace it with a second 9v battery . Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #314 on: May 05, 2010, 08:08:48 AM »

I purchased two of the original kits way back when.

As Cornelious stated bypass T1 with another battery. Wise

This thread has everything you need to know in it.

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #315 on: September 12, 2011, 01:47:54 PM »

This theme is a bit old but ... Topics of the 32 pages due to erroneously associated power supply and coil in short circuit... Now there are new versions of the sandbanks without a T1 and with only a single battery 12V... I have a question for all those who have tried to work with Sandbanks: which is the smallest nugget of gold (1 g - 3 g ...) sandbanks which can detect (with coil 200mm) and at what distance?

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carlosdaniel

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #316 on: March 04, 2012, 12:32:56 PM »

For the person who is not an oscilloscope to measure time for delay and sample in the integrated interesting serious CD4011 that built this period to meter the pus onsite geotech, that performs a correct reading of the above-mentioned times
http://www.geotech1.com/forums/showthread.php?t=14451&page=2

Carlos Daniel

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