TESORO GOLDEN SABRE

[amtech2005]

TESORO GOLDEN SABRE

SimonBaker , I will look for the dimenension's soon . And of course there are "Standard's" or Specifications to follow , PCB dimensions in relation to Integrated circuit size , so the holes line up correctly and the "through-hole" holes are drilled to proper size. "Through-Hole-Holes" ??.....Seriously , It is in the software , that is why we take it for granted , and do not really worry about it. I am just so very happy that 95% of all the projects on the Geotech Forum are "Through Hole Projects" and not "SMT"-Surface Mount. But you know that is going to change someday .... maybe soon , when Multiple "Pic Chips" and "DSP" microprocessors are required for Pulse Induction with Discrimination , and when "Ground Imaging Devices " are DESIGNED and BUILT right here on this Geotech Forum !!!!! Look how we have advanced here in just a few years .......Thanks...........Eugene

[Max]

Hi Max , I read your response , Thank-You . Maybe at the Tesoro factory they just "Tightly wind 100 turns for the TX , measure the dc resistance and then "Tightly wind 110 turns for the RX , measure the dc resistance , Glue it , throw it on the truck , and someone "SCREAMS".... "SHIP-IT"......I know they have Factory Specifications , that are very strict +, - 1% maybe ???? Maybe not a Self-Resonance like you said , but definitely a milli-henry value that must be very strict. I am researching everything again on coils to learn all I can , and also to re-fresh my memory , because I plan to post the "Final Tesoro Golden Sabre Lite-1265". Search-Coil information Later !!!!........Eugene

Hi,
some are very strict... some instead are weak about inductance matching... I think depends on construction... if you always use about 100turns of same wire, same way it's very probable you'll get about same inductance.

This doesn't mean you look for a particular inductance but that you end up with that value always cause you made all coils the same way.

I think their major concern is nulling and phase shift, cause inductance value depends on how many turns they put in former, always same number.

Kind regards,
Max

[maxbiri]

Hi Max

I presume that data about lobo's tx and rx are reversed, not sure of course.

Bye Max

[Max]

Hi Max

I presume that data about lobo's tx and rx are reversed, not sure of course.

Bye Max

Hi,
I think they are eaxct , instead.

The table is from this page, I think all measures made by Carl years ago:

http://geotech.thunting.com/cgi-bin/...oils/index.dat

PS: Lobo's coils are different from TGS and BandidoII

Kind regards,
Max

[maxbiri]

Hi Max

If data are correct i'm doing big mistake in my lobo project.
At this point i need understanding better the coil for lobo before going on with project.

Bye Max

[ivconic]

Testing in 2 phases

1. Phase;
TGSL testing Disc behavior...


http://www.youtube.com/watch?v=lI_U-0lzmp8

[ivconic]

Testing TGSL in 2 phases...

2. Phase, Air test with 2cm silver coin.. (41 to 46cm clear detection, Disc Mode)...

http://www.youtube.com/watch?v=CxUOcCQBqU4

[Esteban]

2. Phase, Air test with 2cm silver coin.. (41 to 46cm clear detection, Disc Mode)...

http://www.youtube.com/watch?v=CxUOcCQBqU4

Ivconic, very good! Wich is the detection depth is normal soil, not very mineralized?

Regards

Esteban

[eclipse]

Great, Ivconic this is remarcable detection and discrimiantion abilities.
Not to mention the head is not "lift me if you can" - 15" and up dia.
Who cares it's an "old" project??

[Max]

Great, Ivconic this is remarcable detection and discrimiantion abilities.
Not to mention the head is not "lift me if you can" - 15" and up dia.
Who cares it's an "old" project??

Hi,
it's not anymore an old project now... it's a renewed one. People here started making mods and tuning on TGS about 1 year ago... and now we see really good results... we saw also before but todays results are related to the lot of work made in tweaking TGS, that's a good MD upgraded for more impressive results at now.

The coil play a very important role, but also do other components... preamp... lm308 etc it's the balance that make devices more and more stable and thus sensitive to far targets.

The disc is also perfect and iron masking was not a big problem even before, I tested similar way with hammers and got good results on my TGS.

The fact is that such kind of MD is really the answer for many searchplaces where you need disc and a good depth.

And all using just an 11'' coil!

Kind regards,
Max

[ivconic]

A friend came to me yesterday to check his new detector CZ7 Pro. I did not intended to shot these clips. Yet after few beers (i am not allowed to drink due recent operation...yet i did it!?) spontaneously we decided to shot clip about TGSL behavior. As you see, all was done pretty "fly"....

TGSL was in Disc mode all the time. Sensitivity was adjusted at "7" (0-10).
Disc pot was at "2" (0-10)...
Audio is loud due "delay" mode i integrated in already made device. I put small "piggy" pcb inside. Coin was 2cm diamm. very thin silver coin.
Actually i swept with it up and down from 41 to 46cm away from coil, so distance is not really important and pretty accurate. I wanted only to show detection over 40cm..hell, it worked even better!
Stabillity is great! Neither one false signal! No chatters...nothing, just clear detection.
Ruller on clip is 50cm long with 1cm blank,extra space from both sides...
Coil is 27cm..
Tested on soil few days ago, but not on this coin (friend brought it yesterday)... 2.5cm old bronze coin cleary detectable at 34cm burried in ground. (Esteban's question)..

So..very nice.
Yet this latest mod, "delay" has some drawbacks; mostly i dont like constant lasting of audio. Man can not distinguish depth and size according to this audio. So i added a simple switch on box, to easilly switch between "delay" mode and "not delay mode". In "not delay mode" TGSL works ordinary with variable lasting and strenght. As coin moved away from coil, audio starts to decay and last shortly, man can easilly distinguish distance and size of detected item.
So operator now can use switch and choose one of 2 working audio modes. Depends of working conditions and demands.
Also VOL. pot. added to adjust loudness, cose now, with latest mod, audio is pretty loud (as on clip)...

Must also say that latest mode "improved" depth!? In "not delay mode" same silver coin detection is bairly audible at 40cm distance, and with "delay mode ON" as you can see and hear on clip, it is very loud and clear up to 46cm!!!
So..this,latest mode is worth of try for sure!

Regards!

[Max]

A friend came to me yesterday to check his new detector CZ7 Pro. I did not intended to shot these clips. Yet after few beers (i am not allowed to drink due recent operation...yet i did it!?) spontaneously we decided to shot clip about TGSL behavior. As you see, all was done pretty "fly"....

TGSL was in Disc mode all the time. Sensitivity was adjusted at "7" (0-10).
Disc pot was at "2" (0-10)...
Audio is loud due "delay" mode i integrated in already made device. I put small "piggy" pcb inside. Coin was 2cm diamm. very thin silver coin.
Actually i swept with it up and down from 41 to 46cm away from coil, so distance is not really important and pretty accurate. I wanted only to show detection over 40cm..hell, it worked even better!
Stabillity is great! Neither one false signal! No chatters...nothing, just clear detection.
Ruller on clip is 50cm long with 1cm blank,extra space from both sides...
Coil is 27cm..
Tested on soil few days ago, but not on this coin (friend brought it yesterday)... 2.5cm old bronze coin cleary detectable at 34cm burried in ground. (Esteban's question)..

So..very nice.
Yet this latest mod, "delay" has some drawbacks; mostly i dont like constant lasting of audio. Man can not distinguish depth and size according to this audio. So i added a simple switch on box, to easilly switch between "delay" mode and "not delay mode". In "not delay mode" TGSL works ordinary with variable lasting and strenght. As coin moved away from coil, audio starts to decay and last shortly, man can easilly distinguish distance and size of detected item.
So operator now can use switch and choose one of 2 working audio modes. Depends of working conditions and demands.
Also VOL. pot. added to adjust loudness, cose now, with latest mod, audio is pretty loud (as on clip)...

Must also say that latest mode "improved" depth!? In "not delay mode" same silver coin detection is bairly audible at 40cm distance, and with "delay mode ON" as you can see and hear on clip, it is very loud and clear up to 46cm!!!
So..this,latest mode is worth of try for sure!

Regards!

Hi Ivconic,
I think you made really good job there... the mod seems work as expected. I mean I expected this delay disturbs both pinpointing and operator "reading" of intensity of signal... but it's really good about catching small , weak peaks over the noise floor... like deep coins signals ARE on TGS.
So you made it!

The 2 modes option is everything needed... a switch... and you have one of the most powerful and reliable VLFs around! You can search with monostable ON ...then when approaching a target you switch off it and listen to signal strenght! That's the right way! That's what I'll do sooner or later on mine too!

So... distance improvement is real when considering that weak signals give too short peaks at headphone too! The mod is working and GOOD , and that's enjoyable for real.

Kind regards,
Max

[ivconic]

"..You can search with monostable ON ...then when approaching a target you switch off it and listen to signal strenght!.."

Exactly Max! This was exactly what i imagined at the first place! You understand it excellent!

[eclipse]

Where should be the SW placed, parallel to 1M trimmer?
The idea of volume control is also nice, 470R in series of the speaker will it be good for that job? Also can I ommit the LED in the monostable block, i think flashing diode will annoy me.

[simonbaker]

Also VOL. pot. added to adjust loudness, cose now, with latest mod, audio is pretty loud (as on clip)...

Do you have a headphone jack installed? If not, how much trouble to use with headphones? Can you just replace the speaker with headphones? Will it save batteries?