TESORO GOLDEN SABRE

[Fred]

Hi Fred,
I see... what about depth with coins ? What about coil ?
Max

Hi Max,
Depth or performance was not a concern , i used this coil to find a small aluminium gear,but i have just tried it with a 35mm coin, it is about 18cm.Coil is 20cm diameter.I have built this coil a long time ago for the Magnum.Its design is on the magnum schematic.At the time i undertood less than today, i made nulling etc as i could but never really used it, the magnum was working but it was too complicated with three 9v batteries and a lot of controls ...
Now i just needed a finished coil and used this one.I was surprised to see it works not so bad.I still have to 100% finish the DD one.
Just searching the small gear i have already found a big stainless-steel knife and a old lighter in my own place,so now i am addicted to it :-) .
Best regards,
Fred.

[Unregistered]

TGS..again!

Hi! MAX.

I dismantled my 28DD coils, because in exactly 0 nulling it is very sensitive at soft touches and selfoscilations too...then I fix the coils in other position... less sensitive...wich give me total silence... but the depth was very reduced. Why???


Regards,

DIRCEU

[Max]

Hi! MAX.

I dismantled my 28DD coils, because in exactly 0 nulling it is very sensitive at soft touches and selfoscilations too...then I fix the coils in other position... less sensitive...wich give me total silence... but the depth was very reduced. Why???


Regards,

DIRCEU

Hi,
depth reduction is due maybe to shape of flux lines that's now different but also about nulling voltage. When you null to zero the DD coils you get maximum balance between the TX and RX and then it's easy that even a small target will cause big variation in Rx voltage from zero point. When you have just partially balanced RX (nulled I mean) you get less relative variation cause your RX output has more voltage accross leads in absence of targets.

Less relative variation means the op. amps see a smaller "useful" signal (the one produced by targets only), thus you lose about SNR, then you lose sensitivity.

Kind regards,
Max

[Max]

Hi Max,
Depth or performance was not a concern , i used this coil to find a small aluminium gear,but i have just tried it with a 35mm coin, it is about 18cm.Coil is 20cm diameter.I have built this coil a long time ago for the Magnum.Its design is on the magnum schematic.At the time i undertood less than today, i made nulling etc as i could but never really used it, the magnum was working but it was too complicated with three 9v batteries and a lot of controls ...
Now i just needed a finished coil and used this one.I was surprised to see it works not so bad.I still have to 100% finish the DD one.
Just searching the small gear i have already found a big stainless-steel knife and a old lighter in my own place,so now i am addicted to it :-) .
Best regards,
Fred.

Hi,
I see. The Magnum is complicated right... even if it's still today an interesting project. I have to made some of these coils again now... for my TGS.... have to find some spare time !

Best regards,
Max

[tiktak]

Hi,

Hi,
Max.
I am going to test TGS under cleaned snow.To see the results.I am shore about one place that have to be cheked.
Anyway,I just finaly find LF442!!!!At last....TLC2262 is inposible to be found here.
I will notice if there is any differance.
My question were I null another coil but noticed that when I hold a coin in my hand the detection is 10cm.I think that with this coil/255X137/TGS will reach around 17-18 cm in ground.I need more.What you will advice me for DD 32 cm?How much turns?For TX and RX?I saw somewhere that Ivconic gives data I think TX=85 RX=90?
How is he buy the way?

Damn still cant reach your results.
Please send me your post address to my e-mail:[email protected]
I am building a new TGS and will be ready in a couple of days.I will send it to you so you could be finaly able to help me.I will be very greatefull and will send you a small surprize.
I plan to make one coil ready and wound another and finaly see what the hell is going on here.
Thanks
p.s.I am almost ready with the pcb for :
Metal detector with meter discriminating
Can you look at this scheme.
So I can ask you a couple of questions.

[Max]

Hi,
Max.
I am going to test TGS under cleaned snow.To see the results.I am shore about one place that have to be cheked.
Anyway,I just finaly find LF442!!!!At last....TLC2262 is inposible to be found here.
I will notice if there is any differance.
My question were I null another coil but noticed that when I hold a coin in my hand the detection is 10cm.I think that with this coil/255X137/TGS will reach around 17-18 cm in ground.I need more.What you will advice me for DD 32 cm?How much turns?For TX and RX?I saw somewhere that Ivconic gives data I think TX=85 RX=90?
How is he buy the way?

Damn still cant reach your results.
Please send me your post address to my e-mail:[email protected]
I am building a new TGS and will be ready in a couple of days.I will send it to you so you could be finaly able to help me.I will be very greatefull and will send you a small surprize.
I plan to make one coil ready and wound another and finaly see what the hell is going on here.
Thanks
p.s.I am almost ready with the pcb for :
Metal detector with meter discriminating
Can you look at this scheme.
So I can ask you a couple of questions.

Hi tiktak,
I have an email that use for MD stuff... that is [email protected] but don't have time to watch there so frequently than I prefer using the forum messages , also private messages I mean , to communicate with other guys here.

About TLC2262... don't worry... other things will be ok too: just avoid the bad tl062 and similar noisy parts that are no good for TGS (you can try using tl072 instead or also tl082 from STM there but not 062 ... too noisy things).

I don't know about Ivconic... I hope he's good.

Abou coil: I get with my 10'' coil (Ivconic's design I've made for TGS) good results on soil... e.g. 1 eur coin at 30-31 cms.

This result is just for a neutral or medium mineralized soil... not so mineralized one. In worse conditions detection is maximum 18-20cms cause of the strong signal from soil that mask good signals from targets.

Kind regards,
Max

[tiktak]

Hi

Hi,
I will try with this new PCB maybe it will be working better.Or maybe the reason is still my coil.
Have you made progress with 12 OO coil?I think that there should be extra capacitators at both windings...
p.s.did you null in DISC or in ALLM?Or there is no diferance?
I will make and another DD255X137.

[tiktak]

Hi

Hi,
And I think that TL072 is even better there.This LF442 make the sound different.But anyway I will test soon on good field.

[Fred]

New coil, incredible resuts.

Hi,
I have just tried my new DD coil, here are the results.
All tests where made in air, with a 1 dollar coin,38mm diameter.Coil is 20cm diameter

When at maximum,the "sens" pot is at 5 o´clock, here i get a few random beeps,i reduce it to 4 o´clock and it is perfect.
-With ground ballance pot a one side (no ground balance),all metal,i could detect the coin at more than 45cm!! With sens at max, barely detectable at almost 50cm. I had to fix the coin on a 1m plastic pipe to avoid detecting my hand.
-With GB properly set, all metal,38cm.
-"Disc" on , 27cm

Now i want to put the GB pot on the front , i let a space for this.
The TGS i really an excellent detector!

Thanks for all who helped here to build it , in particular Qiaozhi,Max,Ivconic Etc.
If i find a treasure i will let you know
No i am going to build to the next project, a PI.
Best regards to all! ,
Fred.

[ivconic]

Hi,

I have just tried my new DD coil, here are the results.
All tests where made in air, with a 1 dollar coin,38mm diameter.Coil is 20cm diameter

When at maximum,the "sens" pot is at 5 o´clock, here i get a few random beeps,i reduce it to 4 o´clock and it is perfect.
-With ground ballance pot a one side (no ground balance),all metal,i could detect the coin at more than 45cm!! With sens at max, barely detectable at almost 50cm. I had to fix the coin on a 1m plastic pipe to avoid detecting my hand.
-With GB properly set, all metal,38cm.
-"Disc" on , 27cm

Now i want to put the GB pot on the front , i let a space for this.
The TGS i really an excellent detector!

Thanks for all who helped here to build it , in particular Qiaozhi,Max,Ivconic Etc.
If i find a treasure i will let you know
No i am going to build to the next project, a PI.
Best regards to all! ,
Fred.

Nice to hear that, Fred! You don't need to put GEB on front panel, you only need to preset it right. Already explained on this thread. But i will suggest you to adjust it to point where is just about to reject ferrite rod.OK you can leave it to produce some mum "crack's" when ferrite rod is few mm's away from coil surface. You dont need to fully reject it. Sdjusted that way, GEB preset will suit your demands on most of types of terrains.
The rest you already experienced (as i see from your post) so no need for further comments. Again congratulation! You've made it right!

Other friends here; i am pretty good now, health problems solved.
Reason i am not showing oftenly here is that i have nothing new to offer. I lost continuity in my works due unexpected problems. Now i need some time to back to bussiness...

Interesting enough is Tesoro Royal Sabre. I was thinking to make it.
Generaly, it is the very same type of detector as Golden Sabre, only with some extra modes. I guess it will be easy to use same coils with it.
Those few Tesoro's designs are very good. Performances are indeed close to performances of newest,todays designs. Of course keep in mind that those are analogue, while newest detectors do involve some "digital" features.
As far as i am concerned, i am pretty satisfied with complete analogue design, as long as it suits my expectations on real field. No need to repeat that i already done a lot of "terrains" with this TGSL i already mad. Results were great (as i posted earlier). To much finds with it, so far. More than satisfied!

Fred, if you want to make really good PI tha i can suggest you to make Delta Pulse. I made over 20 of those so far. Indeed excellent PI design!
Friends,
very Best regards!

[Fred]

Hi Ivconic!

Glad you are back and well !!
Hope you will continue your experiences soon.

About the GEB: i wanted to put it in front panel because if i want to change coils i dont want to open case each time.It´s just one more pot in front, you did not find its necessary when you change coils?

I have right now a PCB etching for the XR71-same as DP, i am glad i have choosen the right one, it took me a few days
The PCB is one side, with pots on PCB, posted on DP thread , really nice work.Should be ready in 10 minutes

Best regards,
Fred.

[nakky]

Hi Ivconic, nice to hear you good now.To much finds, leave something for me please.Grt Nakky.

[ivconic]

Hi Ivconic!

Glad you are back and well !!
Hope you will continue your experiences soon.

About the GEB: i wanted to put it in front panel because if i want to change coils i dont want to open case each time.It´s just one more pot in front, you did not find its necessary when you change coils?

I have right now a PCB etching for the XR71-same as DP, i am glad i have choosen the right one, it took me a few days
The PCB is one side, with pots on PCB, posted on DP thread , really nice work.Should be ready in 10 minutes

Best regards,
Fred.

Yes, you are right there; no matter how much effort i put in making very same coils, i also noticed slice differences between them!? Phase angle must varry from one to another, further it just justify your claims - GEB trimm. must be readjusted a bit (even 1/10mm!) when changing coils. So it is not bad idea at all. But GEB trimm. lays in pretty "noisy" environment, so extra precautions must be taken when wiring it as pot. on fron panel. I still havent found proper way to wire up it there. Must find proper cables....
Yes, actually XR-71 and DP are exact same design. There are few minor changes...also applyable to both. I used 2 sided pcb, KT315 posted in tha past here, on this forum...
Regards!

[ivconic]

Hi Ivconic, nice to hear you good now.To much finds, leave something for me please.Grt Nakky.

Ehm, yes...those terrains are "exhausted" already!?

Last couple times i hardly founded few items....

It is time to "open some books" and explore deep history...looking for eventual new terrains.
Or to buy 4WD vehicle and go deeper in mountains...

Until spring, i have to think it over....

Regards Nakky!

[nakky]

Hi Ivconic,this is my car,it is winter now,time for explore in the books.Grt Nakky.