TESORO GOLDEN SABRE

[SWL]

I connected the coil to the second TGSL board. The signal is clear. This means that either the LF is bad, or minus is weak. I decided to postpone the project until better times.I'd rather do something else

[mostafalesnar91]

my tgsl test video with 5.5 inch loop!!!!
https://m.youtube.com/watch?v=I0vJhNWY2kE

In this video, 10 cm must be added to each item, so when a coin is sensed at 15 cm in this video, it is actually sensed at 25 cm, because this video was taken in a city and a place where 10 cm reduces the result of metal sensation. But somewhere outside the city, 10 cm is added to my test result

[surfdetector]

In this video, 10 cm must be added to each item, so when a coin is sensed at 15 cm in this video, it is actually sensed at 25 cm, because this video was taken in a city and a place where 10 cm reduces the result of metal sensation. But somewhere outside the city, 10 cm is added to my test result

Mostafa it would have been interesting to see you doing the coil nulling.

[mostafalesnar91]

Mostafa it would have been interesting to see you doing the coil nulling.

thanks!!!

[mostafalesnar91]

TGSL with a maximum sense of 70 cm for big things is no different with a pin pointer. In fact, it is very weak.
Does anyone know a vlf metal detector that has a maximum sensitivity of more than one meter ??
What is the maximum sense of IGSL and King Cobra ??

[kt315]

try to understand this thread https://www.geotech1.com/forums/show...831-Cache-Test
before to ask 'more than one meter'.

[surfdetector]

thanks!!!

What I meant is you did not show the coil nulling

[mostafalesnar91]

try to understand this thread https://www.geotech1.com/forums/show...831-Cache-Test
before to ask 'more than one meter'.

The halo effect is not a new topic for me, my friend !!!
In fact, everyone knows that the metal detector senses a little more metal than air due to the oxidation of the metal in the soil and the formation of the halo effect over the years !!!
Now my question is what is the maximum sense of KING COBRA and IGSL and........just in the air and not on the ground ??

[mostafalesnar91]

What I meant is you did not show the coil nulling

google translate is very weak!!!
I did this with a multimeter, move the RX on the TX slowly and reach zero millivolts in AC mode !!!!
Of course, in this method, the angle between RX and TX is not observed, so the amount of sense is slightly reduced!!!!!!!!!!!!!!!!!

[folharin]

the tgsl I made here in Brazil more than ten pieces ...

[folharin]

I last tried aluminum yoke coils for 14 and 20 inch tube televisions ... which worked very well ... so the coil is not as critical

[folharin]

a bobina de desmagnetiza?

[cristiano.sar]

Hi friends,

I just want to share my almost finished TGSL with you.
It is working (detecting) but I need to adjust and finish the coils (shielding, etc...)
By the measurements of my multimeter, the TX coil is oscillating at about 17.6khz and the ideal is about 14.5.
Here is a simple demo of it detecting a brass pestle (from a mortar):

and a picture:

Thanks all that helped me by answer my doubts.

[cristiano.sar]

After building new coils, now I have better results, although, not perfect yet.
My inductance meter (gm328a) sometimes measures the inductance, sometimes not (I think I need to buy a better one) and also need to buy an oscilloscope.
Anyway, measuring the frequencies (connected to the TX pins), I got the values of 15.6 for TX and 14.3 for RX and below is a video of some detection distances for some coins (a portuguese "20 centavos", a french 5 Francs, a quarter dollar and finally a brazilian "40 reis"), for all of them I get a distance about 20cm (more or less) so I thing is still a poor detection compared to others I have seen of detecting a coin at about 30cm.

Here is how I'm securing the coils in place (to prevent deformation) while testing:


Well, I think the next step is to buy better testing tools like a better inductance meter and an oscilloscope.

[Ruben2000]

After building new coils, now I have better results, although, not perfect yet.
My inductance meter (gm328a) sometimes measures the inductance, sometimes not (I think I need to buy a better one) and also need to buy an oscilloscope.
Anyway, measuring the frequencies (connected to the TX pins), I got the values of 15.6 for TX and 14.3 for RX and below is a video of some detection distances for some coins (a portuguese "20 centavos", a french 5 Francs, a quarter dollar and finally a brazilian "40 reis"), for all of them I get a distance about 20cm (more or less) so I thing is still a poor detection compared to others I have seen of detecting a coin at about 30cm.

Here is how I'm securing the coils in place (to prevent deformation) while testing:
[ATTACH]56049[/ATTACH]

Well, I think the next step is to buy better testing tools like a better inductance meter and an oscilloscope.

Here I send you a link so that you can build this inductance meter. I have built it and it is very accurate. So that you are not using threads in the spools, use super glue or fast glue to hold the wires together, it will be easier and less time will take you.
https://youtu.be/hMa-AWyuxaA