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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) >

a simple PI detector schematic

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ron_o

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	Re: a simple PI detector schematic « Reply #30 on: August 23, 2009, 02:47:36 pm »

Hi to everyone at THunting.

I built the P.W Sandbanks detector many years ago and found it to be quite good. Had a few problems with 709 ic "hanging up" but i recall adding a small value cap ( 47pF ) across inputs helped.

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ron_o

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	Re: a simple PI detector schematic « Reply #31 on: August 23, 2009, 03:03:13 pm »

Welcome to the forum.

I still have a SandBanks kit waiting for me to put it together! Shocked

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Eugene52

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Teknetics , Fisher , Discovery3300 and TIANXUN 19 kHz VLF Metal Detector

	Re: a simple PI detector schematic « Reply #32 on: August 23, 2009, 10:36:13 pm »

Hello Ron . Just wondering if you bought the kit or built it from scratch ? I always wondered what numbers were stamped on the adjustable inductor T-1 . It was the Toko 87bx135 . Or the correct inductance and DC resistance . I know there is a modification that eliminates the coil , but sometimes we never give up on finding information about rare original parts .
Thanks for posting about this "Old PI Project"
HH........Eugene

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	Re: a simple PI detector schematic « Reply #33 on: August 24, 2009, 06:21:43 am »

hello conrnelious, in dbp2010, did you used the 2n3773 transistor output? i'm now planning to study the schematic of dbp2010 for possible to build one.

ram,

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	Re: a simple PI detector schematic « Reply #34 on: August 24, 2009, 04:17:52 pm »

Hi Eugene

It was purchased as a kit from either Ambit International or Cirkit Electronics.
I no longer have this detector so unfortunatly i cannot help with the inductor details.
I did however see an updated version of this detector in an article on the net , i'll find
the article out for you.

Regards

Ron

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	Re: a simple PI detector schematic « Reply #35 on: August 25, 2009, 05:05:28 pm »

Hi Eugene

I found the modified Sandbanks article , it uses an ICL 7660 chip to generate the 12 volt line

Web address :-

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www.detektory.wz.cz/download/EP8-2000.pdf

I've a databook on Toko Coils ( somewhere ) i will have a look to see if the info you want
is in it.

Regards

Ron

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	Re: a simple PI detector schematic « Reply #36 on: August 25, 2009, 06:25:54 pm »

	Quote:	Posted by ron_o
Hi Eugene I found the modified Sandbanks article , it uses an ICL 7660 chip to generate the 12 volt line Web address :- You are not allowed to view links. Please Register or Login www.detektory.wz.cz/download/EP8-2000.pdf I've a databook on Toko Coils ( somewhere ) i will have a look to see if the info you want is in it. Regards Ron

Thank-You Ron , I will check the link and maybe later we will find out more about the mysterious inductor that was discontinued !! I know Cornelius was the first to post an alternate circuit a few years back , But I still want to know the original inductance value of T-1.
Regards.........Eugene

HH..........Eugene

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	Re: a simple PI detector schematic « Reply #37 on: August 25, 2009, 06:39:44 pm »

I have the original part but the number does not correlate to anything out there.

If some one can test it I will send it to them. Origanal to be returned. Wise

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	Re: a simple PI detector schematic « Reply #38 on: March 19, 2010, 07:42:48 am »

please.lorez5 shematics help me...

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	Re: a simple PI detector schematic « Reply #39 on: April 19, 2010, 04:25:30 pm »

Hello,

I built this as a project in 1980 . Great machine . I still have this detector and powered up this up this weekend to have go. I must say that it gives good depth 6-7 inch on 10p coin very sensitive to copper coins but picks up rusty nails and good with cutting out all the alumin foil . I need to see if the modifications have been done to my mancine . All the parts were purchase from Cirkit .

If this could descriminate the rust objects this would be an excellent base.

Cheers

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