TESORO GOLDEN SABRE

[simonbaker]

Sorry.. I forgot to add a few details.. I am using .25mm wire (30 gauge I believe). No constraining at all. When I wind coils, I feed the wire through a small container filled with varnish. It is an old pill bottle with two pinholes. The wire goes in one pinhole and out the other so the wire goes on the form "stickey". Let the wire dry for a while. Then just remove the top and gently work the coil off the form. That's it! I usually put a few extra turns on the coils so I can just peel off a layer or two to tune it. Usually, inductance is dead on from coil to coil.

I tested the coil pictured above. No improvement over any other coil I have made. Just looks a lot nicer. Most coils I build, I can detect a 1e at 29 or 30mm. I'm going to build a second circuit board, a little different to see what difference it makes. The coils I have made have been "jumble" wound.. Not neat layers, but they come out with a square cross section.
I was always wondering if layering would make any difference.

Don

Beautiful work...

How do you keep the varnish from building up on the form and also making the coil difficult to remove from the form?

Regards,

-SB

[dfbowers]

dfbowers.

I am happy to see my plan in the real, and to make you satisfied.
I would like to wish you good luck to the enclosure, and thanks the data about the inductancies. Are this data's after or before the constraining?

Sorry.. I forgot to add a few details.. I am using .25mm wire (30 gauge I believe). No constraining at all. When I wind coils, I feed the wire through a small container filled with varnish. It is an old pill bottle with two pinholes. The wire goes in one pinhole and out the other so the wire goes on the form "stickey". Let the wire dry for a while. Then just remove the top and gently work the coil off the form. That's it! I usually put a few extra turns on the coils so I can just peel off a layer or two to tune it. Usually, inductance is dead on from coil to coil.

I tested the coil pictured above. No improvement over any other coil I have made. Just looks a lot nicer. Most coils I build, I can detect a 1e at 29 or 30mm. I'm going to build a second circuit board, a little different to see what difference it makes. The coils I have made have been "jumble" wound.. Not neat layers, but they come out with a square cross section.
I was always wondering if layering would make any difference.

Don

[Dennis the Mennis]

Pip3c.

Nice! Your pattern makes very pretty coils using the "sandwich" method (no string). These required 110t for 6.5mH and 105 for 6.0mH, at least for my winder. Too bad I'm going to enclose them in epoxy!

Don

Hi Don ,

I'm curious :

What detection rate did you get on a 1- and a 2 euro coin with these coils if you already connected them ?
And what AWG did you use ?
When nulling the coils did you had to change the shape of the coil for the best results ?

btw great idea about the 'sandwich construction' !

I was experimenting with these 'construction' for a square coil with sequence in the layers:

the piece of paper was for the contrast, this way you can realy see the layer by layer build up









Only the space was a little too big , perhaps when it's smaller I get a perfect layer by layer and perhaps a small advantage is that these coil can be constrained .

So far it did not bring me any luck nor the desired detection

regards

Dennis the Mennis

[pip3c]

dfbowers.

I am happy to see my plan in the real, and to make you satisfied.
I would like to wish you good luck to the enclosure, and thanks the data about the inductancies. Are this data's after or before the constraining?

[dfbowers]

Hi fellows!

I want to build my own TGSL, following Ivconic's tutorial.
I am not sure about the dimension of the coil, so before I start, I share my coil's plan. It is designed with autocad, and this is a printable pdf version in 1:1. Please comment it! If it is (or will be) a good construction feel free to use it, it is my gift.

Pip3c.

Nice! Your pattern makes very pretty coils using the "sandwich" method (no string). These required 110t for 6.5mH and 105 for 6.0mH, at least for my winder. Too bad I'm going to enclose them in epoxy!

Don

[sevar12]

thanks everything is ok i forget Tx i have -6,5V

[Dennis the Mennis]

Hi every body i bild one TGS but i dont where is this -6,25V before 1n4148 and 470 k i have 0,74 v what is wrong

Hi Sevar ,

Perhaps you mean this point ? :

If so , this part is only for the positive voltage and the battery check .

Please note that for the negative voltage the Tx coil must be connected and you must have (Tx) oscillation , then the negative voltage is generated in this part :



regards ,

Dennis the Mennis

[Cyclonite]

Hi every body i bild one TGS but i dont where is this -6,25V before 1n4148 and 470 k i have 0,74 v what is wrong

Hi @sevar12,

Did you build the TGSL by using @Ivconic's PCB?, for C17 (a+b) or Bi-Pol is connected to -12 Volts.

Are you not you just measuring the DC Voltage drop over the 1N4148 (D9) ?

For more information concerning TGSL Tuning & troubleshooting, you may also want to read this thread:

TGSL Tuning & troubleshooting:

http://www.geotech1.com/forums/showthread.php?t=16122

Regards,

Robert

Attachment: Extraction of problem area referred to by @sevar12

[sevar12]

Hi every body i bild one TGS but i dont where is this -6,25V before 1n4148 and 470 k i have 0,74 v what is wrong

[meridas]

Reply

Hi fellows!

I want to build my own TGSL, following Ivconic's tutorial.
I am not sure about the dimension of the coil, so before I start, I share my coil's plan. It is designed with autocad, and this is a printable pdf version in 1:1. Please comment it! If it is (or will be) a good construction feel free to use it, it is my gift.

If this is ok, than thx your effort, I will use it sure.

[pip3c]

TGSL Coil dimension

Hi fellows!

I want to build my own TGSL, following Ivconic's tutorial.
I am not sure about the dimension of the coil, so before I start, I share my coil's plan. It is designed with autocad, and this is a printable pdf version in 1:1. Please comment it! If it is (or will be) a good construction feel free to use it, it is my gift.

[simonbaker]

24k resistors

There are two 24k resistors used in the TGSL schematic. One is in the TX oscillator, the other is a pull-up for the discrim comparator driving a JFet detector.

Can 22k or 27k resistors be used just as well? Why did Tesoro choose 24k? Especially for the pull-up?

-SB

[simonbaker]

schema,layout files

Qiaozhi -- it would seem that the original Sprint layout and schematic file (.sch ExpressSCH format) should be bundled in the TGS project files; they can be useful for mods.

[Qiaozhi]

Interesting however, is a small bug that does not allow an "8" to be proceeded by a ")"

Yes - I know about that one. The workaround is to simply to add a space between the "8" and the ")". The other solution is turn off support for smileys, and we don't want to do that.

[Qiaozhi]

Corrected one line.. U104 and U105 should be a TL071AN or LM308N.

Don

Replaced parts list with modified version ->

http://www.geotech1.com/forums/showthread.php?t=15710