TESORO GOLDEN SABRE

[Darko]

lf353

Thanks Max.
The local supplier offers only P version of LF353. My TGSL working unstable with good nuled coil and that was reason why I start thinking about P mark on this IC. Now, there's noting left form me to do but to change all of 100p, 15p and 10p caps with multilayer ones and we will see.. Can I do smething more to get better stabillity?
Best Regards

[simonbaker]

Thanks Max.
The local supplier offers only P version of LF353. My TGSL working unstable with good nuled coil and that was reason why I start thinking about P mark on this IC. Now, there's noting left form me to do but to change all of 100p, 15p and 10p caps with multilayer ones and we will see.. Can I do smething more to get better stabillity?
Best Regards

Some questions:

http://www.geotech1.com/forums/showp...9&postcount=31

-SB

[Max]

Thanks Max.
The local supplier offers only P version of LF353. My TGSL working unstable with good nuled coil and that was reason why I start thinking about P mark on this IC. Now, there's noting left form me to do but to change all of 100p, 15p and 10p caps with multilayer ones and we will see.. Can I do smething more to get better stabillity?
Best Regards

I suggest you recheck coil if much unstable.

If have TL062, change with something lower noise... even TL082 is better.

If lot of solder flux at soldering layer, remove with cotton + isoprophilic alcohol.

Use new potentiometers... avoid long wires and mechanical instability... things that move.

Kind regards,
Max

[Qiaozhi]

Can I do smething more to get better stabillity?
Best Regards

I suggest you recheck coil if much unstable.

If have TL062, change with something lower noise... even TL082 is better.

If lot of solder flux at soldering layer, remove with cotton + isoprophilic alcohol.

Use new potentiometers... avoid long wires and mechanical instability... things that move.

Kind regards,
Max

Are you using a plastic enclosure for your TGSL? If so, then line the inside of the box with aluminium foil and connect to the 0V rail.
If instead you're using a metal enclosure, also connect it to 0V.

[Darko]

Re

- TX – 5.87 mH 21,4 ohms ; RX 6.28 mH 22.3
- Tx freq 13.890
I will check rest of things tomorrow. I have several coils with different parimeters and all of them operate at some way. No one of them sealed with epoxy yet.
- Disc Pot is old. I will change this with new one. Firstly there was 22k pot and with no instabillity wen I put 100K detector go to be unstable.
- Aluminium enclosure
- All of parts have original values and LM308 is AN version. But maybe I make mistake there, when due to experiment reasons I was put LF353 and both of 308 in IC sockets.
Thank you guys. Tomorrow I will check voltages. I must go for now.
Best regards

[ivconic]

"....disc pot 22k..." ???!??

Darko your handmade obviously differs much from original (according to what you posted).
So....what do you expect? What kind of stabillity you expect?
It is pretty often and usuall to see here; "...i finished TGS/TGSL....and it is not stabille..." or " ....it can not reach 30cm on 1e coin..".
So...people; what do you expect? You are not respecting given datas, schematics, coil datas, proper way of wirements....etc..etc.... and still you expecting something and complaining?!
So...all what have been posted here on previous 150 pages worth NOTHING, cose you guys are not in a mood to read and obey? You have your own vision of TGS/TGSL? Wildly changing component values and making various unsuitable coils...? I dont understand you?
Dont complain and dont ask for help here. Or...ask...do whatever you want, it is your choice. I wish you luck.

[Darko]

Hi Ivconic

I don't use 22k pot intending to leave it there, but this is just fault. I'm not check pot value before solder it. I must say that TGSL was works wery stable until some time when start to give chaters. I try to back movie back to see what happens.
Neznam baš da napišem na engleskom. Od jednog trenutka je počela nestabilnost, možda kad sam postavio podnožja.Ne mogu da se setim šta sam radio pa je postao nestabilan. Imao sam odličnu detekciju i stabilnu ali sam hteo više i eto.
Mnogo je to dobra mašina i siguran sam da će da proradi opet kao što i treba. Hvala Ivice. Bez tebe ne bih stigao daleko od početka.

[ivconic]

I don't use 22k pot intending to leave it there, but this is just fault. I'm not check pot value before solder it. I must say that TGSL was works wery stable until some time when start to give chaters. I try to back movie back to see what happens.
Neznam baš da napišem na engleskom. Od jednog trenutka je počela nestabilnost, možda kad sam postavio podnožja.Ne mogu da se setim šta sam radio pa je postao nestabilan. Imao sam odličnu detekciju i stabilnu ali sam hteo više i eto.
Mnogo je to dobra mašina i siguran sam da će da proradi opet kao što i treba. Hvala Ivice. Bez tebe ne bih stigao daleko od početka.

Could be ic sockets (moisture and corrosion). Also could be minor drift at coil. And of course could be due some bad component...
Kad je jednom proradio - proradice opet.

[simonbaker]

I don't use 22k pot intending to leave it there, but this is just fault. I'm not check pot value before solder it. I must say that TGSL was works wery stable until some time when start to give chaters. I try to back movie back to see what happens.
Neznam baš da napišem na engleskom. Od jednog trenutka je počela nestabilnost, možda kad sam postavio podnožja.Ne mogu da se setim šta sam radio pa je postao nestabilan. Imao sam odličnu detekciju i stabilnu ali sam hteo više i eto.
Mnogo je to dobra mašina i siguran sam da će da proradi opet kao što i treba. Hvala Ivice. Bez tebe ne bih stigao daleko od početka.

Maybe batteries low????

Ivconic advice on mechanical stability == elec stability very true ( hardest challenge for me). Especially if it worked stable before.

Would still like to see oscilloscope waveforms for interest.

-SB

[ivconic]

Low batteries! Very good point! TGS/TGSL acts exactly as Darko described when batteries are low or bad.

[metaldetector107]

TGSL OO coil

Dear All
i need the data for deepest OO coil to use with my TGSL by Ivconic,
also any explanation about advantage and disadvantage of OO coil

so many thanks

[metaldetector107]

27cm DD coil

Dear All

please i need the Circumference of one turn of 27cm DD by Ivconic
cuz i need it to make circular then make it DD shape..
kind regaards

[simonbaker]

Dear All

please i need the Circumference of one turn of 27cm DD by Ivconic
cuz i need it to make circular then make it DD shape..
kind regaards

I'll try the math, I need the practice....

D shape is 1/2 of 27 cm diameter circle plus diameter, so equals 27 + pi*27/2. That should be about 69 cm circumference (had to look up spelling).

Circular equivalent is pi*diam = 69, so diam = pi / 69 = 22 cm.

I believe you need to make a circle of about 22 cm diameter, then reshape into D (maybe add a centimeter or two to work with).

Do it with string first to make sure!!!

Regards,

-SB

[metaldetector107]

TGSL coil

Dear Simon
so many thanks
but you know the diameter of Ivconic 27cm DD coil its not exactly 13.5cm
as Max mentioned it has 1cm extra for overlapping if look at pictures by Max at page 39... that is why im a bit confused..
any help warmly accepted

best regards

by the way where are Max and Ivco they dont reply i hope they are ok

[simonbaker]

Dear Simon
so many thanks
but you know the diameter of Ivconic 27cm DD coil its not exactly 13.5cm
as Max mentioned it has 1cm extra for overlapping if look at pictures by Max at page 39... that is why im a bit confused..
any help warmly accepted

best regards

by the way where are Max and Ivco they dont reply i hope they are ok

I can't be more exact than to say use your eyes and add a couple of centimeters to get that exact shape. My guess would be to add between 1 and 2 centimeters.

You can print out Max's photo to get proportions. Then draw 27 cm diameter circle on big paper. Cut in half. Then follow Max's photo to draw the extra part, scaling it by measuring photo and using calculator.

Put pins all around D shape and wrap string. Then measure the string. But I think 23 or 24 centimeter round coil quite adequate.

In reality, probably more important to get the inductance correct than the size and shape to the last millimeter. The inductance depends on turns, wire thickness, and how tightly you bind the coil when done. So it is tricky and better to wind a little extra and then remove the extra until correct.

I think Ivconic says 6.0 mH for TX and 6.5 mH for RX, but not sure.

I hope they give advice also, more experience with it.

Regards,

-SB