TGSL beeping when touching

[Sacchetti]

Sacchetti Does it also sound if you gently touch the coil cable.

If so I think you are going to strip the board out of the metal case and test on the bench.

never found a reliable way to test the shield on the bench.

Shield fault tends to be more random chatter sometimes carries on for a few seconds after moving around the coil.

Ground loop problems tend to be more a single beep if touched.


Both can be quite bad in the house an not so bad out in the field.



My detector does not like my soldering iron or florescent lights on. I had a ground loop problem which affected my homemade coil but not a factory coil.


Trouble with these annoying stability problems you can chase yourself round and round in circles. If one coil work and another does not its easy to assume the coil is the fault which it might be. But not always.

Hi Koala,
I have bought another coil but a new one, same model 8"x9" from another internet seller.
I have checked on field the new one and the used one.
I do not have problem with the new one therefore the used one is faulty.

I payed using paypal therefore I open the procedure.

Thank you for your informations.

[Koala]

Glad you are sorted.

[Qiaozhi]

It's likely that the electrostatic shield has become detached within the coil shell. In your homemade coil, it's either the same problem or the cable shield is microphonic. Some screened leads will do that. It's advisable to use a coil cable with a braided shield, and not one where the screen is simply twisted around the inner core. Also, if you connect the "hot" wire to the shield, and the ground to the core by mistake, you'll get some weird results in the field.

[Sacchetti]

It's likely that the electrostatic shield has become detached within the coil shell. In your homemade coil, it's either the same problem or the cable shield is microphonic. Some screened leads will do that. It's advisable to use a coil cable with a braided shield, and not one where the screen is simply twisted around the inner core. Also, if you connect the "hot" wire to the shield, and the ground to the core by mistake, you'll get some weird results in the field.

Hi Qiaozhi!
I have explained I am using only original tessoro coil.
I am using one 11" Concentric used but perfectly working.
The one new original tessoro coil 9"x8" bought to compare with the used one 9"x8". This one is new and also working.
And the used one original tessoro coil 9"x8" bought in ebay but with this problem.
I bought a new one to compare, the last two coil are the same model therefore the used one has the internal coil shell detached. It is the only not working.
I never will buy other used coil in the future. I lost time and money for shipments.

Homemade is only Eldo detector but it is 100% working.

Thank you for your informations.

[Qiaozhi]

I have explained I am using only original tessoro coil.

OK I understand.
In post#14 you wrote: "No, it happen with the coil connected to my selfmade Eldorado (5 pin)."
I thought that meant a selfmade Eldorado coil, but (of course) you must be referring to the PCB.
Yes - it certainly sounds like the electrostatic shield has become detached in the coil shell.

[Koala]

Also, if you connect the "hot" wire to the shield, and the ground to the core by mistake, you'll get some weird results in the field.

Not quite sure what you mean by "hot" and "core" I get weird results in the house with homemade coils even though factory coils are fine. Trying to understand the correct way to wire the shield. Using good quality 4 core microphone wire with the braid for the shield.

[Sacchetti]

OK I understand.
In post#14 you wrote: "No, it happen with the coil connected to my selfmade Eldorado (5 pin)."
I thought that meant a selfmade Eldorado coil, but (of course) you must be referring to the PCB.
Yes - it certainly sounds like the electrostatic shield has become detached in the coil shell.

Yes, I confirm, I referring to PCB.

[Tibuck19]

I am also having a odd problem, My TGSL has and is working fine but lately its been chattier then normal after pulling the board out from the case , I notice if I touch one of the ground balance wire going to the Pot, I get a beep, Even the slightest touch makes it beep and stop when I release the wire. Any ideas ?

[Hyena]

No problem. Unless you are holding your detector by GB wires

Thats common behavior. And also reason why I make them as short as possible.

[Tibuck19]

No problem. Unless you are holding your detector by GB wires

Thats common behavior. And also reason why I make them as short as possible.

TFF, Well, I was using that wire as a handle, Now what i'm I going to use haha. shortly after posting, I replaced the wire with a shorter one, by sacrificing and old DVM lead, that completely solved the issue. Only reason why I was worried about it, was fear it was maybe causing some interference when detecting. Nonetheless good to know its a normal behavior.

[Hyena]

If they must be longer, use shielded cable. And I had also false signals when unshielded GB cables move inside housing freely. So I stick them to case with glue and have no problem after this.

chattier then normal after pulling the board out from the case
This is also common behavior for me, because I think my grounded case is shield against mains 230V. When I even open top cover, it becomes chattier immediately (inside house or anywhere near 230V or high voltage)...

I think your device works well. And it is good when it becomes chattier in mentioned conditions, because you know, that you are near max sensitivity. Without these problems I would be afraid that something is wrong and my machine is partly deaf