Tesoro Eldorado

[aft_72005]

Hi AndyF
This PCB very good designed.
Are you test it?
Best regards.

[Andy_F]

PCB variant.

[ivconic]

Cant say. Havent made coil for it yet. It works...and now waiting in line for coil to make. I do have more important job to do these days.

[WM6]

Thanks Foma!

Hi ivconic, what is state of the art by Eldorado. Better than TGS or not?

[WM6]

The Capacitors 0,047 and 0,033 such as beside BANDIDO.
Consequently worker frequency as beside BANDIDO is equal 10 kHz.
My ELDORADO has a frequency 10,5kHz. The Spool CONCENTRIC.

The Amount whorl is specified aproximately.

Hi FOMA are you made this as elliptical or as circular coil?

Thanks

[ivconic]

Thanks Foma!

[FOMA]

HI IVCONIC.

I have done such spool.I used the wire 0.25mm..
I have not 1 EURO. I have a coin 10 Eurocent.
Sensitivity in mode DISK.=25cm.
Sensitivity in mode ALL MET (AUTOTONE)=30cm.
All measurements conducted in apartment. Here much hindrances and if use the mode ALL MET without mode AUTOTONE, that detector is agitated. And aloud sounds.
Spool CONCENTRIC possible to do and so:

http://thunting.com/geotech/forums/showthread.php?t=10558&goto=nextnewest

[ivconic]

Thanks Foma!
Can you make my life even more easier and tell me have you tried this coil?
What is wire gauge here?
Last, you can tell me air distances for 1e coin and simillar.
I do have now wires 0.3mm and 0.25mm available at the moment.
Yes, 20cm diameter search head is more interesting for me than any larger.
I do prefer small diamm. search coils due many reasons.
Regards!

[FOMA]

The Capacitors 0,047 and 0,033 such as beside BANDIDO.
Consequently worker frequency as beside BANDIDO is equal 10 kHz.
My ELDORADO has a frequency 10,5kHz. The Spool CONCENTRIC.

The Amount whorl is specified aproximately.

[ivconic]

Oh yes...i used brand new TL062's (just got those) instead LF442 (couldnt obtain those). I think those are good substitutions so no need to look for LF442 at all. TL062 works very good in many different designs...

[ivconic]

Problem solved, Eldorado is working. I made trivial mistake reversing FET's. Primary i designed pcb for BF245's and later used J107's...
I checked everything again and again...damn! Finally today i spoted this stupid mistake!
So pcb is accurate! No mistakes. Schematic also, except few details, 15pf must be instead 150pf and 100k instead 10k like Foma posted. I would like to add that 100pf on pin 8. of LM308 will close external compensation and LM308 will work less erratically, almost calm 100%. So i predicted it on pcb and retreived it on its place. It is working fine.
I used TGS coil with Eldorado and have feeling it is not the best solution. It is working descent but not that good as TGS. 1 Euro coin detecting bairly at 15-18cm.Silver fork at 25-28cm, iron piece 4x4cm at 35cm in All Metal mode.
I noticed really good discrimination, maybe a bit better than on TGS.
Al Metal mode is very interesting here, full no motion feature! I like it! Other hand, Disc mode is not full no motion, yet bit better (wider) audio than on TGS. If i can only achieve same depths on coins as with TGS..
I think TGS coil can serve here only in testing purposes, for real performances original Eldorado coil must be made separatelly.
So...c'mon again here; let's conclude few important facts:
-Real original Eldorado frequency,
-Any possible Eldorado coil datas,
-To choose between better design: DD coil or concentric coil?

So far i made only DD coils for tesoro, actually never tried any of c.c. coil.
I guess it is time to try to make some proper c.c. coil ....

[aft_72005]

Hi FOMA
Thank you.
Regards.

[FOMA]

Hi aft 72005.
Horakteristiki my ELDORADO are befitted this data

[aft_72005]

Hi FOMA
Also I interest to know about your experience with eldorado.
How distance can detect coin with 2cm diameter in air ?
Regards.

[FOMA]

Elidoado I have did here is so.