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Originally Posted by ivconic
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...
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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.