TESORO GOLDEN SABRE

[Max]

Hi all,
this message is for friends here that need revised schematic and first PCB differences map....so it's easy find the hot-spots there...cause there aren't component label but just values on that.

So I repost again cause now thread is really long and somehow confusing.

Use revised schematic values... and you'll be fine.

Kind regards,
Max

[Max]

Hi Max,

Does this metal detector have a real DISC on iron?

Regards!

Hi,
iron disc is perfect for all small-medium items.

E.g. in disc mode my unit cannot detect an hammer of 250g at 2cm... but just from less than 1cm to touching the coil bottom...that's cause of hi-distortion caused by hammer head...not cause of disc circuit problems.

With all small (but pure) iron items it's even better... nails etc reject all.

Problem is with larger iron (big plates, boards, poles...) that you can detect cause of same effect : distortion of field is too great.

Some plated iron stuff is always detected: e.g. zinc plated stuff... detection is about zinc layer not iron....and of course... alloys used e.g. in modern screws and the like.

So with pure iron disc is at top as you can gain with VLFs.

Best regards,
Max

[Max]

Hi Max. I have reversed the Rx leads without results. So then i checked the rx signal with Tx and i saw a phase difference. Did you checked the phase difference of Tx and Rx winds??? Is there any difference ???
When i will find free time i will make a new coil.
When i tried to null it i saw that the phase differs from -90 to +90 degrees. Maybe it is time to look it, not only signal null but zero phase shift. VLF detectors are more sensitive to phase shift than to signal null.
Regards

Hi,
yes right ... but I had no time for that... just used the Ivconic's data and nulled the usual way with scope: next time I'll pay more attention to that thing.

You are right... and that's why e.g. me and Ivconic suggested to use some particular "shape" of the central area of DD... it's all about phase there... we use that model and so we are near the good value!
Just using eyes to evaluate.

If you dismantle a coiltek coil you'll see something similar shape + other stuff... but think about orientation of that DD coils: it's all about phase.

We have to make some serious study on that sooner or later... to make repeatable all results on DD coils. Problem is that require enormous amount of time.

The Ivconic's strategy of nulling for best "sens" have much to do with this: means that you could sacrifice some mV nulling to get the right phase... so better detection of wanted things.

Best regards,
Max

[Max]

I want to wind the Rx coil with 0.2mm wire (0.22 with varnich).
Any comment ????
A friend gave me 3Kgr of wire 0.2mm so it is time to put it on the coil

Hi Geo,
don't waste your time. 0.2mm wire is not good for TGS TX... and also RX coil could be impossible to make one really good.

Good , easy values are from 0.25 to 0.3mm (without varnish).

Kind regards,
Max

[Max]

Is this IB like the sascho design(pulse IB disc)? Doesn't detect the color metals beside the ferrous metals I mean.

Regards!

Hi,
this is true... but then there aren't others points similar to TGS and Sasho's ones.

Gold and other "good" metals are detected good by it... only lack is on silver if you have wrong phase or bad geb settings...otherwise not.

Iron is fully disc out cause of the D90 disc circuit by Tesoro. D90 is no tollerant with iron !

Other models that have "extended disc" called ED120 or ED180. They will pick up IRON (and a lot) if you don't set them to 40% or 50% disc pot first. That's cause they are sold as more "general" disc detectors (think e.g. at bandidoII and lobo)... TGS has internal fixed geb trimpot: that say everything... ease of use but not for all soils... the primary target were gold nuggets in river sands or between rocks in medium soils. But of course... is good for many other things too if conditions aren't too worse!

The user of ED120 and ED180 detectors have the ability of setting the GEB multiturn pot... and same for DISC pot to find the "right spots"...... for various situations... but I think this is good just for very expert people... searching in very different kind of soils.
Lobo is a good example of that: complete machine, good for coins, relics, nuggets too... so everything and anywhere... but need experience... otherwise user will be overwelmed by its complexity.

I think that in 60-70% of soils TGS will perform better of many other detectors out there... even the thousand dollars ones.

Kind regards,
Max

[Max]

Hi,
this is first PCB with ALL values according with the revised schematic.


Kind regards,
Max

[erolunall]

DEar Max

470 ohm or 470K which is right?

Regards
Erol Ünal

[Max]

Is this IB like the sascho design(pulse IB disc)? Doesn't detect the color metals beside the ferrous metals I mean.

Regards!

Hi,
with small iron stuff... even hammer... is not a big problem having it near... the masking is much more difficault to avoid when you have e.g. a large iron item at few cms underground... then the small e.g. gold ring at 25 or more cms... in that case it's really easy miss the good target cause the iron stuff overload and out-balance the nulling.

So if good and bad objects are at about same depth... no problems...but if a big iron is much "over" the good thing I strongly think that any VLF will not detect the target.

That's why I'm so skeptic about all the iron masking advertising... my experience say that the local overload will cancel out any good and far influence.

Kind regards,
Max

[Max]

DEar Max

470 ohm or 470K which is right?

Regards
Erol Ünal

Hi,
470Kohm is right.

Thanks for noticed that. Here is correction.

Best regards,
Max

[ivconic]

This is ok except this one;

[Fred]

Thanks for all that good info, particulary Max with the oscillograms , excellent work really usefull.
regards,
fred.

[nelson]

Just to said hello and thanks to Ivconic, Max and all good guys, for enourmous support on getting a better TGS and TGSL.
I m not a master on electronics, but i love electronics. And everyday that i read this forum i learn more.
Best regards
Nelson

This is ok except this one;

[ivconic]

Most of tributes should go to Kurtie100 who was first to post nice,working pcb here!
Before that, i was in troubles with Classic III. Since than i founed best suited project for me!

[Max]

This is ok except this one;

Hi,
yes... but this is actually optimization !
I don't use the 33K anymore...from first week after start-up maybe....don't remember. But maybe is better that people here start first with close to schematics stuff... then improving stuff is easy ...changing some resistors , caps... few stuff for big results.

I suggest people here start first with unoptimized TGS then go further for max performances... just to avoid problems appears too early in development... like the instability

Now I'm posting the PCB again removing the bad TL062 for the original LF442... (people that can find TLC2262 could use it... but this is optimization )

Best regards,
Max

[Max]

Most of tributes should go to Kurtie100 who was first to post nice,working pcb here!
Before that, i was in troubles with Classic III. Since than i founed best suited project for me!

Hi,
yes, right... we have to send our tributes to him.

Now we have an happy detector to play with and that costs very few ... uses also relatively easy stuff, ics... apart really obsolete like LM308.

With mods and right coil it's now much much better than original I think.

With all my respect for white's and people having it... using etc...ClassicIII is a toy compared to an optimized TGS it stays in the middle of performances ! Very average one... and also troubles about schematics stuff... then you need a blue-max coil to get top performances... it's difficault making good coils for it... etc etc etc

I think that a very good one new candidate would be AnkerSS60 (or some its brothers) but with a mod related to GEB... cause without GEB it will be totally unuseful on real soil.

Of course... we can also play with mods on osc of TGS more and more... putting out 30Vpp or more... and see what happens!

Maybe it will beat also SS60 that way in air !

What do you think ?

Best regards,
Max