TGSL mode CMS

[bernte_one]

ok here some pictures

[zoomix]

Original coil for TGSL

Hello, I would like to know the original models coils that I can put on or TGSL IGSL.

I see that there are models and 14/19khz 10/12khz.Les detectors saber II and silver work 10 Khz. The geotechnical TGSL

I know have used a

What original Tesoro coil inductance has the 5.9 and 6.5 mh?

http://www.detecteursdemetaux.net/disques-tesoro, fr, 3.21. cfm

If you know, give me as much info on the model to avoid the error.

Thank you in advance for your answers.

[Firebox]

Hello,

i have the same question like @zoomix

Which original Tesoro coil fits on the TGSL SMD ???

regards

[bernte_one]

http://www.staffsmetaldetectors.co.uk/new_page_100.htm

[Firebox]

THANKS for the info @Bernte_one

[zoomix]

Hello,

I would like to make a récapilatif my tests smd TGSL.

My coils are made with 0.28mm and I precisely these values:
6.5mh and 6mH

The capacitor is 21.8nf TX and RX 16NF. I have a frequency 14.61khz

I had not yet oscilloscope and I am the nulling coils in AC voltmeter, I have the best result 450mv AC pin 7 of U101

I get the 32 cm and 1 euro 5centime

Potentiometer in the middle of the GB and I eliminate a ferrite toroid. (I do not have a cylinder)
With these results, the steel is discirminé with the potentiometer to the minimum. So I do not have control of the metal with the discirmination but aluminum rings and can be discirminer.

Today I had a two oscilloscope traces and I checked the phase in this configuration and I get + - 60 ° phase shift. (RX behind Tx)

So I tried to set at 20 ° and I get better at 28 ° which gives me 34mV AC on pin 7 of U101.

With this setting, the steel is discriminated with the potentiometer discir +-in the middle .. I think the result is better. I keep + - 30cm 1 euro and 5cent.

Here is a picture + - 28 °

a beginner question: The RX voltage is not symetric (-75 +130mv)

Do I have décallé track of RX to TX or focus on is what I have to align the 0V lines?

Also I noticed that I did not -5volts but -6.2volts?

I ask these questions because I'd like your advice before filling the coils.

For the moment these tests are done with the coils off lid but I think I can improve
the nulling with fit snugly in the receptacle coils.

Thank you for your advice

[hugo]

Hi Firebox,
According to your video, it seems that you have got the same detection issue as Ashefr10 and me.
Even if your detector range looks correct.
The sound is not as clean as it can be. The problem comes from the BF245.
I replaced them with two 2N3819. It's just like night and day. (Beware : The pinout is different)
The range increases from less than 20cm up to 35cm.
Please give a chance to these FET !
Keep us in touch.
Regards,
Hugo

[ashefr10]

hi, quite agree with Hugo apparently with some BF245 the result is poor. it is necessary to use another transistor as those cited by Hugo, personally I was recommended the J113 I ordered I will confirm the operation as soon as I receive them.

[Firebox]

Hi Firebox,
According to your video, it seems that you have got the same detection issue as Ashefr10 and me.
Even if your detector range looks correct.
The sound is not as clean as it can be. The problem comes from the BF245.
I replaced them with two 2N3819. It's just like night and day. (Beware : The pinout is different)
The range increases from less than 20cm up to 35cm.
Please give a chance to these FET !
Keep us in touch.
Regards,
Hugo

Hello Hugo,

can you show me the changes in the circuit layout !? maybe with the right pinout

regards

Firebox

[ashefr10]

HI firebox , here is the pinout of the different transistors used.

[ashefr10]

attention to those who have problem like me and Hugo, watch this link you will find that BF245C is available in several pinouts depending on the manufacturer. So it can cause a very bad operation of the detector such as a very poor sensitivity reduced to 20 cm see less depth of detection. So check out the pinout of your transistor. http://www.sonelec-musique.com/elect..._brochage.html

[paku]

the transistor you change is working

[hugo]

Hi Firebox,
ashefr10 is faster than me !
Regards,
Hugo

[ashefr10]

hello, I received my J113 transistors detector works well, it should just be careful to turn 180 degrees the pinout is not the same as the BF245.
So apparently the operation is similar with either 2N3819 or J113.

[zoomix]

Hello,

Here is finally the TGSL functioning properly. Very diffcult to achieve a proper coil.

Dicrimination works fine
impeccable GB

Test in air:
https://www.youtube.com/watch?v=Zu7G7DSoCXE

I am testing in the earth:

50cent euro is taken by TGSL at 20 cm and I compared with the Goldmaxx power who also takes limit.

I noticed that the TGSL must be swept slowly to make the target.

I would now improved sensitivity because I noticed the potentiometer varies very little

have you some tips to make measurements of sensitivity and improved?

Thanks