TESORO GOLDEN SABRE

[ivconic]

Dont know how to null it without cable?
Even it was possible, later cable might distort balance in some (small) percentage...

[Fred]

Ok max, thanks,
I think making parts numbers on the ics would be goo, i can do that when i finish mine.

Ivconic, did you see my post about influnece of connecting cable AFTER nulling? what do you think about it?

So far the nulling i have done was at output of lf353 with scope and comparing phase with tx coil.its interesting to see that we can achieve almost same null voltage but with a slightly different phase between 2 coils.

Regards,
fred.

[ivconic]

Now i remember! I saw 3K9 on some schematic....
I might be check this..
Thanks!

[Max]

What's the story with 3K3 resistor there? It is marked blue. Why? I never modded it...

Hi,
in original PCB file was 3K9. If you use 3K9 you mod a bit disc section behaviour.

Anyway... no big changes. Try it.

Best regards,
Max

[ivconic]

What's the story with 3K3 resistor there? It is marked blue. Why? I never modded it...

[Max]

Max,
The value of the cap below the "new" 33k resistor is missing.
A good idea would be to put numbers on the Ic´s so it is much
easier to find them on the pcb.
Just an idea,if you want to improve even more your work

My detector is working very poorly,25cm max ,disc and notch working,sensitivity makes no much diference.Some oscillograms are not the same than posted by you, i have work to do to find the fault(s).The output tx coil and output of lf353 are ok thought,180º and looking good.

This is part of the fun...i guess.

regards,
Fred.

Hi,
yes... was old mistake... I missed that... thanks.

New revision.

Kind regards,
Max

PS: I think that for part numbers would be better if someone will provide e.g. the original layout file... cause would be a bad thing erasing too much stuff to make room for them. It's easy adding them by the layout program instead of using image manipulations prog.

[Max]

Max,
TLC2262 is much better than LF442 ?

Regards!

Hi,
is good to reduce noise from the notch section. For that purpose it's very good.

Best regards,
Max

[1843]

Max,
TLC2262 is much better than LF442 ?

Regards!

[Fred]

Max,
The value of the cap below the "new" 33k resistor is missing.
A good idea would be to put numbers on the Ic´s so it is much
easier to find them on the pcb.
Just an idea,if you want to improve even more your work

My detector is working very poorly,25cm max ,disc and notch working,sensitivity makes no much diference.Some oscillograms are not the same than posted by you, i have work to do to find the fault(s).The output tx coil and output of lf353 are ok thought,180º and looking good.

This is part of the fun...i guess.

regards,
Fred.

[Max]

Most of tributes should go to Kurtie100 who was first to post nice,working pcb here!
Before that, i was in troubles with Classic III. Since than i founed best suited project for me!

Hi,
yes, right... we have to send our tributes to him.

Now we have an happy detector to play with and that costs very few ... uses also relatively easy stuff, ics... apart really obsolete like LM308.

With mods and right coil it's now much much better than original I think.

With all my respect for white's and people having it... using etc...ClassicIII is a toy compared to an optimized TGS it stays in the middle of performances ! Very average one... and also troubles about schematics stuff... then you need a blue-max coil to get top performances... it's difficault making good coils for it... etc etc etc

I think that a very good one new candidate would be AnkerSS60 (or some its brothers) but with a mod related to GEB... cause without GEB it will be totally unuseful on real soil.

Of course... we can also play with mods on osc of TGS more and more... putting out 30Vpp or more... and see what happens!

Maybe it will beat also SS60 that way in air !

What do you think ?

Best regards,
Max

[Max]

This is ok except this one;

Hi,
yes... but this is actually optimization !
I don't use the 33K anymore...from first week after start-up maybe....don't remember. But maybe is better that people here start first with close to schematics stuff... then improving stuff is easy ...changing some resistors , caps... few stuff for big results.

I suggest people here start first with unoptimized TGS then go further for max performances... just to avoid problems appears too early in development... like the instability

Now I'm posting the PCB again removing the bad TL062 for the original LF442... (people that can find TLC2262 could use it... but this is optimization )

Best regards,
Max

[ivconic]

Most of tributes should go to Kurtie100 who was first to post nice,working pcb here!
Before that, i was in troubles with Classic III. Since than i founed best suited project for me!

[nelson]

Just to said hello and thanks to Ivconic, Max and all good guys, for enourmous support on getting a better TGS and TGSL.
I m not a master on electronics, but i love electronics. And everyday that i read this forum i learn more.
Best regards
Nelson

This is ok except this one;

[Fred]

Thanks for all that good info, particulary Max with the oscillograms , excellent work really usefull.
regards,
fred.

[ivconic]

This is ok except this one;