TL12000

[Asanka Sanjeewa]

Hi GeoMax
I don't have TL12000 Metal Detector. i made it as a my home made project. But it didn't work. no sound and pulse genarator and coil worked. Here the my PCB Photos

[Asanka Sanjeewa]

how it iron discrimination level, please watch these videos
https://www.youtube.com/watch?v=tkAyBmjUA04
https://www.youtube.com/watch?v=RDfZBu-GrEc&t=50s

[Asanka Sanjeewa]

Here the depth range for square coil
https://www.youtube.com/watch?v=XKzR...7ng5A&index=11

[GeoMax]

Hi Asanka Sanjeewa,

I had a look at the videos. It is strange (or a fake) the detector can detect a large piece of car brake from a far distance but an iron plier near not. That is strange. Are you sure that in all three videos the same detector circuit shows? Maybe they are fake videos like so many stuff on YouTube.
Based on the circuit it is not possible to discriminate like that. If you would study the Gold Scan 4 circuit, you would understand what we mean.

GeoMax

[pigeon]

Hi Asanka Sanjeewa,

I had a look at the videos. It is strange (or a fake) the detector can detect a large piece of car brake from a far distance but an iron plier near not. That is strange. Are you sure that in all three videos the same detector circuit shows? Maybe they are fake videos like so many stuff on YouTube.
Based on the circuit it is not possible to discriminate like that. If you would study the Gold Scan 4 circuit, you would understand what we mean.

GeoMax

yes it is a real video

[Qiaozhi]

We would need a complete correct schematic diagram to make a fair assessment of this design.
To paraphrase GeoMax: "The video cannot be taken at face value".

[pigeon]

We would need a complete correct schematic diagram to make a fair assessment of this design.
To paraphrase GeoMax: "The video cannot be taken at face value".

Hi friend

I have only this schematic

thank you

[GeoMax]

Hi,
the detector seen in the video shows some respectful good performance. No doubt about this. Further, the schematic looks also simple and interesting (to me). This is also the second schematic I have seen so far who uses a LF398 (Sample and Hold IC).
If you would replace the LF398 IC chip with an ordinary sample and hold circuit, than the circuit of the TL12000 contains almost the same circuit blocks like the ProScan or Sandbanks PI. There is also no differential amplifier to remove the EF ground signal like in the Mini Pulse, Surf Master or Barracuda etc. In order to have a true discrimination capability, you need at least 2 signal channels for high and low conductivity targets like seen in the Gold Scan 4 e.g. But in the TL12000 is only one channel seen. Therefore, the circuit of the TL12000 is not able to make a true discrimination of iron or distinguish between gold an iron targets.
@ Videos
In on Video you can hear no “beep” if an iron object (hammer / plier) in front of the coil is. However, in another video the same detector “beeps” if you place an old car brake in a distance of about 2 meter. If there is a true iron discrimination, the detector should not beep at all. That’s why I have doubts about the videos.

Anyway, it is definitely an interesting circuit and I will try it out to see its capability.
GeoMax

[Ruben2000]

Here a TL 12000 PDF of Mr. Mehdi's PCBPBC TL 12000.pdf

[pigeon]

1

[sbalio1]

this vedio is correct i
the pcb is correct the same problem is low sound . but you can solve it by add bd140 or /772.

[Asanka Sanjeewa]

මෙහෙදි මහතාගේ PCB හි TL 12000 PDF එකක්[ATTACH]57030[/ATTACH]

Dear my all friends
this pcb pattern is true, many home made producers got good results using this pcb pattern, here the evidence
https://www.youtube.com/shorts/lWv2CsdGNl0

https://www.youtube.com/shorts/-1AxUkCHLC0
https://www.youtube.com/watch?v=5cERLZtnut4
Here the my small help for this PCB PATTERN

Thank you my friend Ruban

[Asanka Sanjeewa]

[ඇමුණුම]57044[/ATTACH]
Here the my small help for this PCB pattern
Thank you

[Asanka Sanjeewa]

මෙම vedio එක හරි i
pcb එක හරි එකම ප්*රශ්නේ අඩු සද්දේ . නමුත් ඔබට එය bd140 හෝ /772 එකතු කිරීමෙන් විසඳිය හැක.

You are correct friend, If you want, you can use this pcb pattern, all are same

TL12000 BY EL SAADANI_035909.zip
This is true video of this pcb model useing made
https://www.youtube.com/watch?v=tkAyBmjUA04&t=28s

[pigeon]

the TL12000 is a detector of German origin but it has been modified or improved by the Iranians