TESORO GOLDEN SABRE

[mostafalesnar91]

why no one answer???

[Carl-NC]

Tesoro coils.

[ivconic]

Older series of Tesoro coils have very unique specifications, I don't know if anyone has ever made similar ones.
TX=5.7-6mH and RX=6-6.5mH, 18-22 ohms.
So the hobbyist is forced to self-build. Which is not a problem.
We have elaborated the production of such coils on several occasions at the forum.
I once gave a PDF somewhere with instructions. And later Don Bowers gave an even better and neater PDF with more complete instructions.
You just have to look for those files on the forum.

[surfdetector]

We have elaborated the production of such coils on several occasions at the forum.
I once gave a PDF somewhere with instructions. And later Don Bowers gave an even better and neater PDF with more complete instructions.
You just have to look for those files on the forum.

https://www.geotech1.com/forums/show...mplete-Details

[Bayu]

hello everyone, I hope you are always healthy. few days ago i have built TGSL EDU, all components as per directions on pcb board except bf245 replaced 2sk30a and lm 308 d replaced ua741. coil I use 23cm air test results are good, 2gram 18k ring detected 25-28cm, but there is one problem! when I test on high mineral soil / red soil, it always sounds even though there is no target. GB, SENS, have been set in such a way that they are still detected. any solution for my TGSL? thanks

[waltr]

hello everyone, I hope you are always healthy. few days ago i have built TGSL EDU, all components as per directions on pcb board except bf245 replaced 2sk30a and lm 308 d replaced ua741. coil I use 23cm air test results are good, 2gram 18k ring detected 25-28cm, but there is one problem! when I test on high mineral soil / red soil, it always sounds even though there is no target. GB, SENS, have been set in such a way that they are still detected. any solution for my TGSL? thanks

The GB adjustment pot is very touchy and may need to be tweaked a tiny bit. Do this on the red soil by pumping the coil up and down, closer to - farther from soil. Adjust GB until no response from bring it near the soil.

I had the same thing when I built the TGSL and GB needed a very small tweak.
Do recheck on a silver coin to ensure the GB isn't turned too far.

[kt315]

connect an o-scope to preamp output. bring the red soil above the coil, give us video what you see on a screen.

[Bayu]

connect an o-scope to preamp output. bring the red soil above the coil, give us video what you see on a screen.

this is a picture of the preamp lf353 pin 7. I used red bricks as an illustration of mineral soil, when I put the bricks on the coil, there was no change, which means the picture doesn't seem to change

[Bayu]

The GB adjustment pot is very touchy and may need to be tweaked a tiny bit. Do this on the red soil by pumping the coil up and down, closer to - farther from soil. Adjust GB until no response from bring it near the soil.

I had the same thing when I built the TGSL and GB needed a very small tweak.
Do recheck on a silver coin to ensure the GB isn't turned too far.

I've tried pumping above the ground, I set the GB from min to max but the ground is still detected. our land is like the land in australia, is there anything i should change on my machine?

[Carl-NC]

Does the strength of the ground response change as you vary the GB setting?

[waltr]

Also, does the GB timing to the FET gate on TR5 change when you turn the GB pot?
See the TGSL_101.pdf page 9.

[Bayu]

when at my desk, I illustrated the bricks as minerals, when I rotated the GB pot, slowly the bricks started not being detected until the brick detection disappeared, but after I tried it on the ground, the soil was still detected, when I pumped it above the ground and set the GB , didn't change much, only reduced a bit, and I tried moving the coil 15cm above the ground the result was pretty undetectable, but only metal in the game was detected.

[Bayu]

Also, does the GB timing to the FET gate on TR5 change when you turn the GB pot?
See the TGSL_101.pdf page 9.

I haven't tried it yet

[Carl-NC]

when at my desk, I illustrated the bricks as minerals, when I rotated the GB pot, slowly the bricks started not being detected until the brick detection disappeared, but after I tried it on the ground, the soil was still detected, when I pumped it above the ground and set the GB , didn't change much, only reduced a bit, and I tried moving the coil 15cm above the ground the result was pretty undetectable, but only metal in the game was detected.

It sounds like you don't have enough GB range. Try increasing C10 to, say, 220pF.

[Bayu]

It sounds like you don't have enough GB range. Try increasing C10 to, say, 220pF.

Thanks master i try it