Underwater detector - build suggestion

[CDI]

Can somebody point me about underwater machine. I wanna make one for river and lake hunting, with small 16 cm coil.
Prefer to be vlf machine. I dont need extreme deep machine, 15 cm in air for euro coin will be enough.
The question is: How to make some things waterproof, i mean switch, coil, maybe pot's? For case i will use pvc pipe, similiar on Minelab Exalibur.
Machine should be TGSL with long board. Does anyone tried TGSL underwater?

[blobber]

Hi CDI, if you are still interested I could give you some informations, how I have made in 2004 a waterproof homemade detector. It was an motion/dynamic PI with discrimination, but unfortunately only the good things will be rejected. The circuit diagram I found in a german book for metall detectors, without any further information. Interesting for me would be, if somebody is knowing more about it (name, factory or developer) I have made it water proof in a way, which was easy for me, all pots and headphone too, also pre preasured with max. 0,5 bar. If you want, I can make and post some pictures here and my crazy hand drawing layout file too.
The detector is running very stable, you not need to adjust while searching. A good friend is a hobby diver, he used my machine with success. I was using it some times while snorkeling in salt water in spain and found a lot of coins and rings. Detection in air is 24 cm 1€. 20 cm coil, 20 windings.

[6666]

Hi CDI, if you are still interested I could give you some informations, how I have made in 2004 a waterproof homemade detector. It was an motion/dynamic PI with discrimination, but unfortunately only the good things will be rejected. The circuit diagram I found in a german book for metall detectors, without any further information. Interesting for me would be, if somebody is knowing more about it (name, factory or developer) I have made it water proof in a way, which was easy for me, all pots and headphone too, also pre preasured with max. 0,5 bar. If you want, I can make and post some pictures here and my crazy hand drawing layout file too.
The detector is running very stable, you not need to adjust while searching. A good friend is a hobby diver, he used my machine with success. I was using it some times while snorkeling in salt water in spain and found a lot of coins and rings. Detection in air is 24 cm 1€. 20 cm coil, 20 windings.

Could you post your project information thanks, sounds interesting.

[blobber]

[blobber]

Well, I have made today a short video and also some pictures of my unit and scans from the book. In the book are some informations,
about layout, but I have made the pcb a bit smaller. All was working well, but as I put it today in the water...
Sorry..
Now I have to dry and seal the unit, to hope to show you a video, when it is working.


Here a link for my stupid mistake today....

https://youtu.be/Is36BtlC-zI

[blobber]

I am realy glad, because after my stupid mistake today, to put the detector in a bucket with water, without leak test.
Now all is dried in the sun, while I was at work and the unit is working now as before.
Now I will make a new sealant and replace all seal washers. Next time, I do also with pre compressed air, so that any leak will easy to located.

https://youtu.be/9z1rWMOpB28

[blobber]

Does anybody know the real name of this detector? Who has developed him?

[kt315]

garrett XL-500 pulse... that is like a base of your clone...

[CDI]

Thank you blobber for those information's. Do u have pcb files?

[blobber]

garrett XL-500 pulse... that is like a base of your clone...

Thank you kt315, now I get a name for my mashine. I had no idea, that it is in real too, a under water metal detector. Interesting...

[6666]

Hi CDI, if you are still interested I could give you some informations, how I have made in 2004 a waterproof homemade detector. It was an motion/dynamic PI with discrimination, but unfortunately only the good things will be rejected. The circuit diagram I found in a german book for metall detectors, without any further information. Interesting for me would be, if somebody is knowing more about it (name, factory or developer) I have made it water proof in a way, which was easy for me, all pots and headphone too, also pre preasured with max. 0,5 bar. If you want, I can make and post some pictures here and my crazy hand drawing layout file too.
The detector is running very stable, you not need to adjust while searching. A good friend is a hobby diver, he used my machine with success. I was using it some times while snorkeling in salt water in spain and found a lot of coins and rings. Detection in air is 24 cm 1€. 20 cm coil, 20 windings.

Thanks for posting your project details, its good to know that exact schematic works, good work.

[blobber]

Thank you blobber for those information's. Do u have pcb files?

Yes CDI, right now, because I know the name now.
Google gave me this

http://www.treasurequestxlt.com/comm...pso-jpg.56183/

I have made my own in 2004, I can post here. But as I said before, it is crazy.
I want to make a new file in sprint layout 5, but I need little time to do.

[blobber]

Thanks for posting your project details, its good to know that exact schematic works, good work.

Yes, and now that I know how the machine is, I am proud that I have a real garrett detector...sweet

[6666]

Would you mind giving a description on how you made the coil housing, looks to be covered with silicon ? thanks.

[blobber]

The coil I have made from epoxy resin, fiberglass and cotton flakes.
First I laminated 2-3 layers fiberglass 165 g/qm on a flat surface, which is protected with PP-foil. The 20 turns of wire comes directly on the layers. With thickened resin with cotton flakes, in a consistence like butter, I filled all gaps, transitions and reinforcements. A piece of rubber ist placed for the rod holder. Than again comes two layers of fibre glass 165g/qm drapable twill fabric (Google translation, I don't know if this is correct). All layers are laminated wet on wet.
When all is dry and hard, you can cut the shape of your coil you want.

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