what is most deeper for big abject, two box or good pi detector?

goverton

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #10 on: September 21, 2011, 04:09:08 pm »

	Quote:	Posted by mehdi
thank you, but but i am looking for home build one.

WoW, I wish I could build one cheaper than buying one! Shocked

I know prices of used ones in good condition are available.....guess it depends on what you want to spend Lips Sealed

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GoldDigger1950

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #11 on: September 21, 2011, 04:54:05 pm »

Very true, Goverton. Buying is most often much cheaper than building. One has to consider how much is available for him in his native Azerbaijan though. Some countries don't allow detectors to be imported.

One thing he is doing wrong is asking a generic question about which can go deeper. If he first defined the object in general terms he'd get the best answer. For example, "I'm searching for a metal strongbox about 2' by 3' in size buried around 4' in the ground."

Once you know his true needs, the best advice can be given. There are other variables, of course, and further clarification might be required.

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #12 on: September 24, 2011, 12:44:47 pm »

goverton and GoldDigger1950, thanks a lot for your reply. yes, i can't buy any metal detector in my country so i want to build one that can go deep in the ground for a 50*50cm iron sheet, better than delta pulse!
thanks in advance

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GoldDigger1950

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #13 on: September 24, 2011, 04:07:21 pm »

	Quote:	Posted by mehdi
goverton and GoldDigger1950, thanks a lot for your reply. yes, i can't buy any metal detector in my country so i want to build one that can go deep in the ground for a 50*50cm iron sheet, better than delta pulse! thanks in advance

You still haven't told us how deep you expect it to be. Also, if you know the soil type and conditions of the soil, it will help give you the best answer.

One other thing. If you have no skills at using a detector before now, you won't get any serious depth to your search. You need to be able to determine what is a good signal and what is not. There is no magic wand that beeps for what you are seeking and not for other things. You are going to find that anywhere you look on earth is going to be loaded with other things that may confuse your results. More so if you are a novice at this.

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #14 on: September 25, 2011, 12:39:02 pm »

	Quote:	Posted by GoldDigger1950
You still haven't told us how deep you expect it to be. Also, if you know the soil type and conditions of the soil, it will help give you the best answer. One other thing. If you have no skills at using a detector before now, you won't get any serious depth to your search. You need to be able to determine what is a good signal and what is not. There is no magic wand that beeps for what you are seeking and not for other things. You are going to find that anywhere you look on earth is going to be loaded with other things that may confuse your results. More so if you are a novice at this.

ok, it must detect 50*50cm iron sheet with 1*1m coil at more than 2/5 meter or max detection depth with 1*1 meter coil for biggest object must be more than 4 meter in air. the soil is mineralize but not matter, i want it can detect in air!!
i was work with some detector and i can say that i can use them to find!! but may be i am not skillful in using the metal detector.
i was built some detector such as surf pi, BRN-1 pi, delta pulse and some others, but they can't detect 50*50cm iron sheet more than 2 meter. i want build one detector that can detect it more than 2/5 meter.
thanks in advance

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GoldDigger1950

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #15 on: September 25, 2011, 07:56:49 pm »

I don't know what you mean by "in air" if the target is in the ground.

Just about any PI can detect a sheet if iron that big in the ground at 2 meters if you know your machine. If not, you will miss it. Making a bigger coil won't help at all. Everyone who tries to add a bigger coil to an existing machine fails because they forget one important factor. A machine and coil are designed together. The coil is driven by a fixed output amplified signal that cannot supply enough energy to make a larger coil work. It just can't be done. You must redesign the output stage to feed the larger coil. Then, of course, if you put the original coil back on, you destroy your detector.

I advise you to stay away from a PI machine in which you build a bigger coil. Oh, you can do it and even get an output but you will not have any increase in depth. Size alone doesn't make a difference.

Get a two box detector or build one. They will go to depths of 10 meters on such a target.

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #16 on: September 27, 2011, 09:33:40 am »

	Quote:	Posted by GoldDigger1950
I don't know what you mean by "in air" if the target is in the ground. Just about any PI can detect a sheet if iron that big in the ground at 2 meters if you know your machine. If not, you will miss it. Making a bigger coil won't help at all. Everyone who tries to add a bigger coil to an existing machine fails because they forget one important factor. A machine and coil are designed together. The coil is driven by a fixed output amplified signal that cannot supply enough energy to make a larger coil work. It just can't be done. You must redesign the output stage to feed the larger coil. Then, of course, if you put the original coil back on, you destroy your detector. I advise you to stay away from a PI machine in which you build a bigger coil. Oh, you can do it and even get an output but you will not have any increase in depth. Size alone doesn't make a difference. Get a two box detector or build one. They will go to depths of 10 meters on such a target.

Hi, thank you, this is very supreme answer.
two box, wow 10 meters!!! this is what i want!!! which two box is your mean? any schematic?! or any address that i can find the schematic and pcb to build that.
with many thanks

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goverton

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #17 on: September 28, 2011, 05:44:17 am »

Will this help?

you can see schematic of TM 808

Posted on: September 28, 2011, 05:34:40 AM

ck this link for more schematics Great

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Posted on: September 28, 2011, 05:38:47 AM

go here and download zipped file for alot more info on how to build the Whites TM808
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There are 7 attachment(s) in this post which you can not view or download Please register for viewing them. TM808BO.jpg TM808S.jpg board.jpg tm808 depth.jpg tm808.jpg tm808_board.jpg tm808a.jpg
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mehdi

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #18 on: September 29, 2011, 01:36:59 am »

Hi goverton
thanks a lot for your help, i know TM808 is very good MD and it is a few simple to build the circuit but making and calibration of two coil is very hard, i have not any information about the coils, do you have?!
my friend was built this device but he can't make good coils and can't calibrate so it don't work good Undecided

i wonder to know if here is any info about the coils of TM808 or any other good schematic of two box that i can build it.
many thanks in advance

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goverton

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	Re: what is most deeper for big abject, two box or good pi detector? « Reply #19 on: September 29, 2011, 04:32:24 am »

	Quote:	Posted by mehdi
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go to this link and download file. Choose "Free" downloading option. Wait 60 seconds and download file. I think it has what you want!

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