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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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homefire

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #10 on: January 01, 2010, 06:45:14 PM »

What E-176?

There is a E-1761

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aliman Topic starter

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Trying to build one

	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #11 on: January 01, 2010, 07:23:01 PM »

I think the 1 at the end of E-176 1 is refering to the quantity of that transistor, correct me if I'm wrong.

Aliman

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #12 on: January 01, 2010, 08:01:25 PM »

One the Schematic its listed as E176....

On the Parts list its listed as E1761

I'm looking for the complement of the 2n3918 that would work.

Jim

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carlosdaniel

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #13 on: January 02, 2010, 08:00:23 AM »

E176 is a fet channel P.You can replace with these fet channel P : 2N5460,62,63,64,65, 2N3820

Carlosdaniel
this FET P works as a variable resistor in the integrated 555 and acts as a variable frequency oscillator according to the voltage

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #14 on: January 02, 2010, 08:48:57 AM »

Thankz Carlos! Looks like I went Dyslexic on my last post.

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #15 on: January 02, 2010, 12:30:24 PM »

Thanks for the part subs, Carlos, you to Homefire.

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #16 on: January 03, 2010, 05:08:40 PM »

Al . Tomorrow I will post a complete Sandbanks PI detector to you . No use building the thing since I had one laying around . You should receive it in about one week ( it is up to the postal service ! ) . Read the letters I enclosed and be careful with your power hook-up .It is better to use some heavier batteries ( instead of the regular 9v batteries ) . The only thing you have to do is make the coil . That coil is one with a diameter of 200 mm , the cu enamelled wire to use is 0.4 mm (26 s.w.g. ) , the amount of windings are 20 . you can start making this coil so you are ready when you receive my package . Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #17 on: January 03, 2010, 05:55:31 PM »

Build the coil as Cornelius states.

Once you get it up and runing I will show you how to make it Hot on gold and speed things up.

This is all in the write Up but between lines.

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #18 on: January 03, 2010, 06:14:33 PM »

Thanks Homefire for helping Al out . I am sometimes too bussy . Explain to him that he can make a coil of lesser diameter but that he has to increase the amount of windings ( to get the right resistance as with the regular coin ) . Of course he can reach deeper targets by using this smaller diameter coil. Thanks again Cornelius

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	Re: Beginner would like to build Sandbanks PI Metal Detector « Reply #19 on: January 03, 2010, 06:47:31 PM »

The original write up was lacking on the coil.

I think I used 20 swg 2oo MM and 2o windings. It worked quite well. That is what was supplied in the kit I used and the one I just sold.

Let him get it working first.

Es No Problem. Es Nada!

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