IGSL

[Amalio]

Sí, me gustaría opinión Ivconic aquí también. Les puedo decir que he probado extensamente la "hierba mojada" de configuración y que es la única manera de que yo llegue a construir otra bobina TGSL! Tengo completamente construido en el barrio de 10 o 11 bobinas de ahora. Ivconic ha construido probablemente puede más. Muy pronto en los puestos de TGSL, Ivconic se utiliza una configuración de puesta a tierra similar, pero más tarde cambió a la configuración en la parte superior, según la norma de Tesoro, por alguna razón. La gran diferencia es que U101a pin 6 no se conecta con el escudo en cualquier manera, yo estaba especulando que el ruido de la bobina en la hierba húmeda que venía de esa conexión. Desconexión de los que resuelve el problema sin crear otros problemas. Ver post # 39 http://www.geotech1.com/forums/showt...t=12692&page=2 Don

hello

I still not work with wet grass,dry TGSL work well for me.

consider his advice

Amalio

[ivconic]

Hi Ivconic,

sorry to bother you but I am at the exact position of starting to make the coils for the IGSL with TGSL coils. The Kit has been ordered from SilverDog and I am going to use the info's about windings and impedance's given in Don' Bowers excellent TGSL 101 Part 1, that is all on the following picture, I hope its readable:-
.....
Are those the correct details to use, or do you recommend any changes? See the first picture.

Also I plan to use the "wet Grass" connection diagram using a USB cable to the electronics, as shown in the second picture.....any comment there?

...

Andy

Maybe you don't know; but i've been absent from Geotech for longer period. I haven't followed TGSL related topics since than.
I did quite job on TGSL in the past.. and once when i was tired of it - i simply left others to continue.
So i am not really "updated" about new things that maybe occurred there... nor i am following those any more.
I don't know about Don' Bowers works nor i don't know about any "wet Grass"...whatever it may be!?
I said already all i wanted and had to say on TGSL subject in the past. I made 67 TGSL's so far. Enough is enough, you must admit that..

Everything related to TGSL - which i take AS RELEVANT (for my account); you may found here:

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

So... there you have all my answers related to TGSL and coil for it.
Also...since first IGSL version do share same coil with TGSL - all you need, relevant, is there...

Cheers!

[ivconic]

Yes, I would like Ivconic's opinion here as well. I can tell you that I have extensively tested the "wet grass" configuration and that is the only way that I will ever build another TGSL coil!! I have completely built in the neighborhood of 10 or 11 coils now. Ivconic has probably built may more. Very early on in the TGSL posts, Ivconic was using a similar grounding configuration, but then later changed it to the configuration at the top, per Tesoro's standard for some reason.

The big difference is that U101a pin 6 does not connect to the shield in any way, I was speculating that noise from the coil in wet grass was coming from that connection. Disconnecting it solves the problem without creating other issues.

See post # 39
http://www.geotech1.com/forums/showt...t=12692&page=2

Don

I really don't know what is all about... haven't followed.
Give me some time, i will try to catch up!

[ivconic]

Pardon my ignorance, I haven't used a scope lately, and I forgot a lot about Peak to peak, RMS, etc. But if I get a sinewave on TX where the amplitude goes above the zero line to 10V,- (two divisions x 5V per div.) then thats 20 volts peak to peak right? , Ivconics said he was getting 16 V peak to peak on tx after adjusting pot. Then my TX is working ok, that plus Ivconics said minelab coil is wired internally differently than TGSL coil which would probably explain poor performance on my IGSL with musketeer coil copy. No one else here seems to be having success duplicating musketeer coil. If thats the case I might as well just go ahead and change back to the old tried and true TGSL coil and osc.!

All the time i was trying to point you on fact that you are not using your scope properly!

Of course you have 20vpp! It can go even up to 22vpp.
Now; lower it a bit to "smooth" up that little "notch" on the top of sinus. Than you will have some 15-16vpp.. which is quite optimal for IGSL.
Musketeer coil is easy to make.
Problem is in internal wiring. It is not the same as in coils for TGSL.
I think i already explained that? Didn't i?
...
So, you just be patient and involve a bit more effort around that coil, i am sure you will have success later.

[ivconic]

hello

I still not work with wet grass,dry TGSL work well for me.

consider his advice

Amalio

Amalio,
No sé lo que están hablando?
Qué "wet grass" !?
Yo no hecho que "húmedo hierba"...
TGSL funciona bien para mí también, sin "seco o húmedo hierba" !
Ayayayay!
No te preocupes acerca de lo ellos que hablar..... "il grupo teórico" !

Aplausos !

[ivconic]

Ooooh! Der Fisherman, now i understand your question!
You posted picture in HUGE resolution, way out of visible area on my monitor!
I had to slide to right to see the rest of it!
...
I see...
now i know what is "wet grass"!!!

Well... i don't see nothing bad in that!
I can agree with "wet grass" kind of setup.
I used first method and so far hadn't problems.. but yes, you are right, it is possible unwanted "loops" to occur (i think this is relative/dependable on cable type you will use),
so it is probably better to wire it up like it was showed on "wet grass" setup...
Agree!

[ivconic]

But than again... USB cable !!?!?!?

I never ever used USB cable to connect coil with detector!?

Which idea it was!?

Of course "loops" will occur in such case!
USB cable is projected for connecting USB peripherals with PC AND NOT coils to detector!!!

That's why i had not any problems with Belden cable i used... and you have problems with USB!!
Now is all clear!

[ivconic]

For my TGSL coils (and one for IGSL) i used this one:

http://thelakes.ca/dt/2009-12-16-131...revisited.html

[Amalio]

Hello

TGSL only tested dry, not wet grass.

My TGSL video cable.

TGSL stable, not false signal,

so far two TGSL, same way of working

regards

[der_fisherman]

Your link does not work, can you correct the problem for us?

Thanks

Andy

[der_fisherman]

Maybe you don't know; but i've been absent from Geotech for longer period. I haven't followed TGSL related topics since than.
I did quite job on TGSL in the past.. and once when i was tired of it - i simply left others to continue.
So i am not really "updated" about new things that maybe occurred there... nor i am following those any more.
I don't know about Don' Bowers works nor i don't know about any "wet Grass"...whatever it may be!?
I said already all i wanted and had to say on TGSL subject in the past. I made 67 TGSL's so far. Enough is enough, you must admit that..

Everything related to TGSL - which i take AS RELEVANT (for my account); you may found here:

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

So... there you have all my answers related to TGSL and coil for it.
Also...since first IGSL version do share same coil with TGSL - all you need, relevant, is there...

Cheers!

Cheers Ivconic!!

I was just trying to be as exact as possible, I will build the Don B. version TGSL coil first as I have already made the former for that, I hope it works well for me!! Its slightly smaller than the version talked about in the other version 3.0 you mentioned.....

I am also going to try to build a more "flat" coil, to see if there are any improvements to be made in that direction. I will be posting the ideas behind the construction here shortly, once I have made the diagrams. the thoughts are based on some constructional details that appear to work well with Mono coil PI designs.....

You have built many, many versions of the metal detector, really fantastic....well done and thanks again for your words and confidences to us all....you are the best informed of us all in this respect.

I will post the final results for my IGSL MD with Don's TGSL search coil at some point in the future good or bad....but it will probably be a few months before I manage it......

Warmest regards and stay healthy

Andy

[der_fisherman]

TGSL "Wet Grass" Coil Connections and grounding

The wet grass connections I showed in a previous post, yesterday I think, are from Don and there is no more "loop" in the ground connections (which is generally bad in electronics as you probably well know), where the ground is only connected to one side of the search coil cable at the electronics end, not in the search coil head.

Don has also made a change to a connection to the electronics.....and he has tried both fixes (he probably made them!!).....

When you previously said build a TGSL coil, I thought you meant the TGSL 101.pdf construction details and that's where I saw the cable, grounding and shield connecting info's, both of them - the original TGSL and the "wet grass" version.....my mistake....

So if you are further interested to look at the wet grass connections idea, look at TGSL 101 part 1.pdf from Don....it makes sense for me personally to NOT have any ground loops.....having see the havoc it can bring with it when running long signal cables between digital equipment, I made a lot of money years ago with finding and fixing such problems.....

Have a great day and thanks again for everything.

regards

Andy

[ivconic]

Where can i find that "TGSL 101.pdf" ?

[Jerry]

Where can i find that "TGSL 101.pdf" ?

Check out post 4649 here : http://www.geotech1.com/forums/showt...101#post128960

Jerry

[der_fisherman]

TGSL 101.PDF

Where can i find that "TGSL 101.pdf" ?

I will re-post it here for you, both parts are very interesting and I also feel they belong to IGSL people as much as TGSL....its from Don.