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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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Topic: Beginner would like to build Sandbanks PI Metal Detector (Read 9918 times)

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Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #270 on: February 08, 2010, 09:52:11 AM »

Ali , Xavier is right . Do not use any wire around the coil . It would be the same as moving the coil over wire . If it is mentioned in the instructions there is something wrong . Shielding the coil is a different matter but you are not up to that yet . For the time being you can wind insulating tape around the coil bundle .Cornelius

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aliman Topic starter

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #271 on: February 08, 2010, 10:50:08 AM »

Cornelius, I wired the switch to the 0V, but when I turn the switch OFF, and the audio goes to a very high pitch and dosen't seem to turn OFF. I have to unplug the power for it to stop??

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Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #272 on: February 08, 2010, 11:13:04 AM »

Ali , you connect the black and red wire ( the plus and the minus ) to one side of the switch . The other side of the switch will be connected to the OV on the board . This must switch both batteries off . Maybe it is better when you use a double switch and use the two positive wires to be disconnected . Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #273 on: February 08, 2010, 12:58:50 PM »

Cornelius, I have enclosed a pic of the connection to the switch. It is inbetween 0V and power connection. Is this right, because it still won't turn OFF until I unplug the power?

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Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #274 on: February 08, 2010, 01:14:31 PM »

Ali . I can't quite see what you did . As I remarked above maybe better for you to use a double switch ( two on - neutral -two off ). Hook this switch up between the positive wires . The plug you are using , with the hot wires soldered to it , are these five contacts seperate . Some of these plugs have one contact going to ground . If you were not carefull with soldering one of the other contacts may be connected to ground also . I don't know what to suggest other than using the double switch . Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #275 on: February 08, 2010, 02:36:25 PM »

Thanks Cornelius. I used a DPST switch, connected it the way you specified, works perfectly.

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xavier

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #276 on: February 08, 2010, 04:27:59 PM »

He he Aliman

Angry

Don't you dare blow it up again Grin

and stop fooling around and go out there and find stuff so that we can see all of our effort in gold and silver Kiss

By the way may I suggest that now you start to try and understand how it works it will help you a lot in the future.
Happy hunting my friend

Xavier

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #277 on: February 08, 2010, 05:03:08 PM »

Ali , do as Xavier told you . Make a second coil . A smaller diameter coil will detect very small objects sooner than a larger coil . A larger coil will go deeper but will not detect the smaller objects . Measure the circumferense of the coil ( in your case 2 x PI x R ) and multiply that by the amount of windings ( in your case 20 ) . That will give you the total length of the Cu wire you used . Use this same length to wind a coil with a smaller or larger coil . Try it , you will like to work with the new material you built yourself . Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #278 on: February 08, 2010, 07:00:29 PM »

You guys are right, that was the last modification I was planning. Belieave me, I can't wait to get out there, unfortunately the ground outside is covered in about 0.5 meter of snow.
So I have to wait about another month to find some Goodies. AGHHH....... Thumbs Down

Aliman

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #279 on: February 09, 2010, 12:37:58 AM »

Hey that's ok, it gives you the time to study the functionality of the whole thing like what is IC1 555 and what is it used for, how come is there a pulse and why is there a TIP 31A and not a BC 184 you can go very deep in to the study of the design and you will have a totally new perception of the whole thing.

Xavier

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