TESORO GOLDEN SABRE

[Max]

Uh! I think that is way to much consumption!
With ordinary 8 ohms speaker /0.25W, my devices drains 25-30mA without sound and approx. 60mA with loud sound (full detection)....
Funny...same drains i measured yesterday on old&rusty Micronta 4003!
Regards Max!


P.S.
Yup! 105 and 100 and 107 and 102 are best numbers so far.....0.25mm/255x137

Hi,
I had hi consumption during tests using some lower impedance speakers 8 and also 4 ohm I've tested...

Some larger are pretty happy with lot of current drain: sound is loud sometimes but this require much current... and peaks lead to circuit instability if too high.

Sure I haven't that on my finished TGS but much less... and audio is not weak using the old 16ohm speaker of apple computer.

Also I use headphones and just during pinpoint sometimes I use internal speaker or when test on the bench, this both for saving batteries and to get better audio when there's noise etc or for weak signals that are subtle. I suggest everybody use headphones with TGS cause there are real advantages over any speaker employed.

Kind regards,
Max

[tiktak]

Hi,

Hi,
Max.
You mean green circle!Right?
I use only red lead of multimeter.Black is leaved a side.
And it shows 28,.. kHz.
Did you remember 2N2222?
Could this be the same?
Please check the numbers again!I see:11,4;12,5;12,75;13,35;13,7 and 1,6cm~!~~~
Thanks

[tiktak]

Hi

Hi

[ivconic]

...
I m a o't a here...

[Molzar]

Hi,
Max.
You mean green circle!Right?
I use only red lead of multimeter.Black is leaved a side.
And it shows 28,.. kHz.
Did you remember 2N2222?
Could this be the same?
Please check the numbers again!I see:11,4;12,5;12,75;13,35;13,7 and 1,6cm~!~~~
Thanks

tiktak,

Red lead from multimeter is to point Max shows is correct to measure Tx Freq, but you need also to connect black lead to ground (battery negative) on TGS pcb. This is basic measurement pricipal, measurement with reference to ground.

Molzar

[tiktak]

HI

Hi,
Molzar.
So this should be.
But I remember that I have asked someone and have remember as a basic principal that I should use only Red and just leve bleck a side.Its looked strange to me but.
Thanks.I will rechek soon.

[Max]

Hi,
Molzar.
So this should be.
But I remember that I have asked someone and have remember as a basic principal that I should use only Red and just leve bleck a side.Its looked strange to me but.
Thanks.I will rechek soon.

Hi,
Molzar told you... use that black wire... connect it to gnd and the red one to the collector of the PNP transistor at point #1.

You should read the right frequency.

Kind regards,
Max

[rdec4]

What is the best choice for TGSL and TGS: BF245B or TIS75?

[ivconic]

Most probably TIS75. But i never tried it cose couldn't find in local shops.

[Max]

What is the best choice for TGSL and TGS: BF245B or TIS75?

Hi,
I think it's really difficault question but best answer is maybe "do not change much"... I've tested all kind of BF245 on it and goes well any case... the TIS75 are very obsolete now so I would suggest you using newer stuff, really easy to find still today like BFs are.

Then you could try experiment different fets there like J107 too, but as I told you, there are not much differences if device works. If some parameter is too far from working (e.g. vgs value) it will just don't work or work totaly unstable... otherwise you'll have just small differences.

Differences are few cause there are other stuff that give much stronger effects than fets kind: fets there are employed in a way (sampler) you'll get spurious transients during commutation... and these effects are always there , no matter of fet kind you use... and they are heavy about stability in any case.

Then also you cannot say this is better than that ignoring which stuff is connected to which other... like ics you use there, sometimes device interactions are more relevant than single device choice, so you can consider any TGS you mount by hand different from the previous, unless you use some "factory" strategy for to reach a "standard"... all same lot for active components...1% maximum tolerance, all same PCB and cleaning procedures, SMT etc etc like Tesoro's factory do.

I will also say that even if you use all these care and smt strategy, hardly you'll get exactly same TGS clones... cause devices are really put to the limit of tweaking here and so hardly you'll get exactly same results from 2 units : this happens also with commercial units, it's not big news sometimes one works better than the other and goes deeper, that's why usually dealers leave users test detectors before buy. Experienced THs knows that could be some difference, in the same model/brand, due to manifacturing process so they wanna see with their eyes before buy. Slight differences, of course, but that could "make the difference" for an experienced TH.

Only brands that could give you strong warranty on e.g. performances are those who have very small production (few hundreds or thousand unit per year): they really tune to the limit and by hand/operator the single unit to match performances declared, and this happens both in the PI and VLF arena. These are really hi-end units and costs are very high too.
I think also some big brands switched to the "factory" strategy when numbers rised up a limit they cannot anymore match with "operator tuning" : that's why probably they produce today just average detectors and not anymore pearls.

Kind regards,
Max

[tiktak]

Hi,

Hi,
Max.
I am londering for thia audio mode for TGS.Did you try some?
This variant with LM388 looks cool.
But I cant find one.Yesterday I have saw LM380N which is also Audio Power Amplif 2,5w.Can I use the same circuit and just replace 388 with 380?
Thanks

[Max]

Hi,
Max.
I am londering for thia audio mode for TGS.Did you try some?
This variant with LM388 looks cool.
But I cant find one.Yesterday I have saw LM380N which is also Audio Power Amplif 2,5w.Can I use the same circuit and just replace 388 with 380?
Thanks

Hi,
lm388 is 1.5w but I think there ar eno problems using it instead of lm380...

problem of TGS audio are related not just to amplifiers ... it's all weak cause it's supposed you use it with phones mostly to save battery and got weak signals... or use the internal speaker that's probably enough for most of things outdoor.

Really... I don't like anymore LM380 idea for it and I'm looking at RH audio with lot of interest to see if I can adapt to tesoro's: I see it easy... but for now I'm ok with TGS and wanna see what we can do with RH before returning to TGS mods and upgrades. Probably I will test later on TGSL instead on my pole mounted TGS.

Kind regards,
Max

[Hardi]

Hi Max,
I'v just finished my First DD coil but i'm not sure about the it. 2cm coin could be detected at 25cm in air and 2.8cm at 30cm. What could be expected for the showing coins in the picture. Can you advise please.
Hardi

23.5 DD coil

[Max]

Hi Max,
I'v just finished my First DD coil but i'm not sure about the it. 2cm coin could be detected at 25cm in air and 2.8cm at 30cm. What could be expected for the showing coins in the picture. Can you advise please.
Hardi

23.5 DD coil

Hi,
it's not bad result for a smaller DD coil that standard Ivconic's design. I think there's room for some improvement on circuit an eventually nulling.

Have you nulled at 15mVpp or less ? What about wire, is 30AWG ?

I think you can experiment with some nF more or less at RX coil to see if get an increase in the range (probably you'll get that way).

What about disc ? Does it disc out iron completely in disc mode ?

Kind regards,
Max

[Shahab]

Hi Max,
I'v just finished my First DD coil but i'm not sure about the it. 2cm coin could be detected at 25cm in air and 2.8cm at 30cm. What could be expected for the showing coins in the picture. Can you advise please.
Hardi

23.5 DD coil

Hi
Excuse me for my question!
Where are you from?