TESORO GOLDEN SABRE

[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

[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

[erolunall]

DEar Max

470 ohm or 470K which is right?

Regards
Erol Ünal

[Max]

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


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]

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]

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]

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 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

[Geo]

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

Regards!

As i know this is a general problem (for all the VLF detectors)

[1843]

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

Regards!

[Geo]

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

[Fred]

Ha 1843, so you mean real disc .. well it works, but not so good with gold,and OK with copper.But as i told you i am not a reference here, just a newbie with bad coils...for sure others can answer you better than me.

Max,i have re-checked my wire diameter, it gives 0.29mm with varnish.
But i have found the problem:the zener diode i used was 5.6V! so i changed to a 5.1V (the lowest i have)and eliminated the 4148, and oscillator went to 16.3khz.
So now i have to rewind a new coil.
Thanks,
regards,
Fred

[Geo]

Hi,
try to reverse RX leads (if you can... I mean if there isn't some connection inside e.g. epoxy that make this last try impossible) and test again... sometimes it works... with a bit of luck.

If not... you need a right coil there at rx... so you need a new coil.

Use Ivconic's data:

TX 100 turns
RX 105 turns
wire 30AWG (0.25 without varnish)

and take a look at my drawings on wood. This is a great coil for TGS.

Standard Tesoro coils are about 5.75mH at TX and 6.2mH at RX... but you can just forget about standard params and use Ivconic's data...for the 10'' coil. They are really accurate.

Best regards,
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

[1843]

Thanks fred!

If you put a gold ring beside the pliers, can it detect the gold?