End of the Mineoro link on youtube

[hung]

No, but yes some person(s) in Mineoro.

Sorry to correct you on this Esteban, but actually only one person did this in the past when that challenge was up, around 2006 at Damasio's request. Since then I can safely say that this person no more watches this forum.
Actually neither this or any other forum.

Regards.

PS. How's the toroid experiments doing?

[Esteban]

Sorry to correct you on this Esteban, but actually only one person did this in the past when that challenge was up, around 2006 at Damasio's request. Since then I can safely say that this person no more watches this forum.
Actually neither this or any other forum.

Regards.

PS. How's the toroid experiments doing?

OK, thanks for clarify.

I'm preparing, have built aluminium loop where toroid is inserted. The magnetic PD is great, expect with this toroid can be better.

Regards

[ivconic]

OK, thanks for clarify.

I'm preparing, have built aluminium loop where toroid is inserted. The magnetic PD is great, expect with this toroid can be better.

Regards

What's that!? LRL based on TM808!?
White's must be informed about this!!!

[Esteban]

What's that!? LRL based on TM808!?
White's must be informed about this!!!

White's make a good job with this "shortcircuited" loop. The point failed is the Allen screw, that you must to press time by time for to mantain good contact. This bad contact lose a lot of sensibility. 0.01 ohm in screw is crucial here. Do you remember my tips about constructing it?

I think Tesoro, Garrett and other brands must be informed about your great industry, too... My industry is very poor... I'm only a hobbyist, but you're a professional in this matter.

Regards

[ivconic]

White's make a good job with this "shortcircuited" loop. The point failed is the Allen screw, that you must to press time by time for to mantain good contact. This bad contact lose a lot of sensibility. 0.01 ohm in screw is crucial here. Do you remember my tips about constructing it?

I think Tesoro, Garrett and other brands must be informed about your great industry, too... My industry is very poor... I'm only a hobbyist, but you're a professional in this matter.

Regards

My "great industry" is based on TGSL, Delta Pulse, SMW and few Zahori's. I sold 1 unit in 2 months - that's the rate of success! I am GIANT! They should fear!
Inform Garrett and Tesoro and you will kill them - by laughing them to death!

[ivconic]

"...The point failed is the Allen screw, that you must to press time by time for to mantain good contact. This bad contact lose a lot of sensibility. 0.01 ohm in screw is crucial here..."

BTW...did you knew you can weld Al? All you need is some stronger welder or at least 100W soldering iron. Use sharp knife to clean ends which are about to be soldered and apply melted rosin, than fast press tin with fervent soldering iron and heat the place good. Tin will form nice coat over Al surface and than you can easilly link those ends.
But all this you must do very fast because Al oxidate very fast in air.
Do few times and you will become an expert.
That's how i fixed few TM808's so far!
Also i fixed my Troy X3 shaft with same method, only welder was much stronger...

[Esteban]

My "great industry" is based on TGSL, Delta Pulse, SMW and few Zahori's. I sold 1 unit in 2 months - that's the rate of success! I am GIANT! They should fear!
Inform Garrett and Tesoro and you will kill them - by laughing them to death!

I remind that you're the constructor of (regarding your words): "far 30 of this", "far 30 of this other"... etc. So if only you sold 1 unit in 2 months, you have surplus in your garage... Or... all this is pure exagerations?

[Esteban]

"...The point failed is the Allen screw, that you must to press time by time for to mantain good contact. This bad contact lose a lot of sensibility. 0.01 ohm in screw is crucial here..."

BTW...did you knew you can weld Al? All you need is some stronger welder or at least 100W soldering iron. Use sharp knife to clean ends which are about to be soldered and apply melted rosin, than fast press tin with fervent soldering iron and heat the place good. Tin will form nice coat over Al surface and than you can easilly link those ends.
But all this you must do very fast because Al oxidate very fast in air.
Do few times and you will become an expert.
That's how i fixed few TM808's so far!
Also i fixed my Troy X3 shaft with same method, only welder was much stronger...

Thanks. I use the principle of White's... you know what for! So, I "invent" my own system...

[ivconic]

I remind that you're the constructor of (regarding your words): "far 30 of this", "far 30 of this other"... etc. So if only you sold 1 unit in 2 months, you have surplus in your garage... Or... all this is pure exagerations?

No, i made over 200 so far, 200 different (some of those never finished, some of those are not worth to mention). But, how many years passed? I was talking about selling "rate". I don't have surplus, pitty. Right now i have only one SMW and several different coils and nothing else...
Oh, i should be very lucky if i sold all those that i made. Maybe 30 i gave as present to some people... or exhchange for something else..
You know very well what i am talking about. I beleive you also had simillar situations.


Besides; not my guilt cose MD manufacturers seems not interested for such "small" markets as Serbia, so we here are faced to tough choice; to make our own detectors ...or to wait somebody from abroad to smuggle something (pretty rare case).
If major manufacturers were presented here officially with shops and customer service - i would never even try to make metal detector, instead i would buy one...much easier to me. But once i made my first good detector....everything started! Without my slitest intention to spend life like that...dealing with those. Now is to late to turn back... But remember; it was not my choice than!

[ivconic]

Thanks. I use the principle of White's... you know what for! So, I "invent" my own system...

Actually; i always wanted to read detailed technical explanation about TM808 design. Not manual, not review - but details about electronic stages, roles of each stage and idea of design itself.
I can not say that i don't know how 2 box supposed to work, i know some details of course. But i would like to see and read facts from designers. Pitty i never saw anything simillar. I like Payne's articles just because he talks pretty straightforward and it is easy to learn from him. I can say that also i liked Carl's articles on HH subject; also straightforward and understandable. Andy Flind also, Don Lancaster also. But majority of others are writing pretty general, hard to learn details.
So speaking of TM808...Esteban..you would be mostly on your own, when designing such coils..

I can point you on "Deep seeking metal locator" by Phil Wait and Roger Harrison, i beleive you already saw that project. There you can see pretty good explained coil & loop coupling, for such matters that you are planing to explore...

[WM6]

A

Actually; i always wanted to read detailed technical explanation about TM808 design.

The problem with these T/R searches is that you can not have anything metallic on you, otherwise you alone generate false signals. So a plastic digging tool or hunting for two.

[ivconic]

The problem with these T/R searches is that you can not have anything metallic on you, otherwise you alone generate false signals. So a plastic digging tool or hunting for two.

I am awared of that.
I am interested in precise explanations of it's working principles. Not generally explained, but in exact details. For example; i would like to know how they calculated coupling relation between Al loop and small coil inside it? What relation? What is resonance of Al loop? What happening if loop was with different sizes? What are merrits and what drawbacks from such coupling. Is loop size dependable on working frequency and how? How possibly that loop can be suitable for such low frequency? Is it the coupled coil the one which solving that issue?
Working frequency in relation to all of that? Etc..etc...

Wild guess: instead Al loop, why not use another coil coupled with existing one on ferrite rod? Depths will be lower but better directional sensitivity maybe achieved? Other type of coupling? Coil?

Following simiillar logic we can come to conclusion that any other nonmotion metal detector can also be easilly adapted to work as 2 box? Right or wrong?

[Esteban]

Actually; i always wanted to read detailed technical explanation about TM808 design. Not manual, not review - but details about electronic stages, roles of each stage and idea of design itself.
I can not say that i don't know how 2 box supposed to work, i know some details of course. But i would like to see and read facts from designers. Pitty i never saw anything simillar. I like Payne's articles just because he talks pretty straightforward and it is easy to learn from him. I can say that also i liked Carl's articles on HH subject; also straightforward and understandable. Andy Flind also, Don Lancaster also. But majority of others are writing pretty general, hard to learn details.
So speaking of TM808...Esteban..you would be mostly on your own, when designing such coils..

I can point you on "Deep seeking metal locator" by Phil Wait and Roger Harrison, i beleive you already saw that project. There you can see pretty good explained coil & loop coupling, for such matters that you are planing to explore...

I found very interesting the Phil Wait and Roger Harrison project. Tank capacitor, mechanical adjustment for zero, tune capacitor and other points are very delicate here. When persons construct it, they forget that is extremely important the final adjustment. Here the most failed.

Anout TM808, maybe in patent are explained function of each stage. We have schematics of this, also PCB in SMD version posted here few years ago... Now, somebody built it and wich performance present in comparisson the original? Hummm! Here is the problem. I used the original detector and the only big problem I found with it is the bad performance in terrain extremely wet... This detector is very sensitive. I remember I found with it copper mineral, green mineral.

[WM6]

. For example; i would like to know how they calculated coupling relation between Al loop and small coil inside it? What relation? What is resonance of Al loop? What happening if loop was with different sizes? What are merrits and what drawbacks from such coupling. Is loop size dependable on working frequency and how? How possibly that loop can be suitable for such low frequency? Is it the coupled coil the one which solving that issue?

What do you mean by "Al loop and small coil inside it"? Maybe schematic is some unclear regarding coils, but Al loop are not inductive coupled to "small coil" but electric connected by wire in one only coil. "Small coil" are secondary winding inside ferite potcore and form togheter with Al loop one coil which resonate down harmonic to primary (tunable) LC tank. So loop and "small coil" byself resonate out of TR frequency and are by this only slightly coupled which cause by near target escape from balanced (tuned) nulling at given resonance and by this tone in RX (like by un-nulled device).

[ivconic]

What do you mean by "Al loop and small coil inside it"? Maybe schematic is some unclear regarding coils, but Al loop are not inductive coupled to "small coil" but electric connected by wire in one only coil. "Small coil" are secondary winding inside ferite potcore and form togheter with Al loop one coil which resonate down harmonic to primary (tunable) LC tank. So loop and "small coil" byself resonate out of TR frequency and are by this only slightly coupled which cause by near target escape from balanced (tuned) nulling at given resonance and by this tone in RX (like by un-nulled device).

Is that was the case!? I mixed it up than! Had also another project on my mind. Never mind, my question is still there, only preformulated. Calculations..i am interesting to see what calculations were used there..