Tesoro Eldorado on the bench

[paku]

ivconic can you propose the best coil inductance and some detail operation for this eldorado
what is the diameter size for D coil
TX ? mH
RX ? mH
what is the copper coil size ?

[MaverickITA]

Use TIS75 or equivalent

what is replacement for BF245 ?

[paku]

Today I want share My Best coil I get
For Eldorado

Inductance
5.5mH
4.5mH

Fit on Bulgarian Coil housing

the best deep for 1 euro is 38cm

Best Regard, Paku

[paku]

i need ask what is voltage output
From Board
TX ?.V
RX ?.V
without coil

[reis_43]

hellp me please
What is the value of the number of pieces that give

[WM6]

How you think to build this, if you cannot read parts from schematic:

http://www.geotech1.com/forums/showt...3282#post83282

[reis_43]

sorry Unprocessed thats scheme...thanks WM6.

[WM6]

Wish you all success with this classic Tesoro VLF/IB diamond.

[paku]

dot forget make video

[Sacchetti]

Hi to all friends of this marvellous place!

I am a new user, an electronic hobbyest.
I have built Eldorado with success using the schematic and layout similar to the one present in this forum, thank you.
Sensibility? 1 Euro coin sound at about 25cm in air and undergound, it is enough for my experiments.

It works very well in normal and in discrimination mode but I have only one problem: I have bought an used coil.
This coil is an original tessoro 5 pin, concentric 8.5"x9.5".
The values about resistance and mH of TX and RX are as standard tessoro equal to the values showed in this web site and forum.
The problem is: I get a sound when I move the cable of the coil and as you know it is impossible to fix the cable perfectly.

My question is the following: this means the coil is broken or I have done something wrong in connection or something else?
Can I solve the problem? And if yes, what I must change to solve it?

I appreciate in advance your help, I hope quickly!
THANK YOU VERY MUCH.
Best regards, Sacchetti.

[Sacchetti]

Hi to all friends of this marvellous place!

I am a new user, an electronic hobbyest.
I have built Eldorado with success using the schematic and layout similar to the one present in this forum, thank you.
Sensibility? 1 Euro coin sound at about 25cm in air and undergound, it is enough for my experiments.

It works very well in normal and in discrimination mode but I have only one problem: I have bought an used coil.
This coil is an original tessoro 5 pin, concentric 8.5"x9.5".
The values about resistance and mH of TX and RX are as standard tessoro equal to the values showed in this web site and forum.
The problem is: I get a sound when I move the cable of the coil and as you know it is impossible to fix the cable perfectly.

My question is the following: this means the coil is broken or I have done something wrong in connection or something else?
Can I solve the problem? And if yes, what I must change to solve it?

I appreciate in advance your help, I hope quickly!
THANK YOU VERY MUCH.
Best regards, Sacchetti.

Another information:
I have already read this thread: http://www.geotech1.com/forums/showt...l+moving+cable
But I have a problem using an original tessoro coil.
Please, help me. Thanks to all.

[Sacchetti]

Yes, version 3 is better.

However take attention to have the coil always connected.
You can get a short circuit to 7808 regulator if you disconnect it while the circuit is powered!

And in every case this solution do not increase sensibility.

Hi!

How to select best mod for negative voltage of original Eldorado sheet?

I like ver 3 !!

are you?

[Sacchetti]

Another information:
I have already read this thread: http://www.geotech1.com/forums/showt...l+moving+cable
But I have a problem using an original tessoro coil.
Please, help me. Thanks to all.

I am trying to connect the coil to the circuit in a different way.
Stay tuned, I will inform you about what I get as result.

[Sacchetti]

I am trying to connect the coil to the circuit in a different way.
Stay tuned, I will inform you about what I get as result.

I have done many tests and checks but I do not found a way to solve the problem at the moment.
Moving the cable or touching the coil the MD sound.

Can be it is necessary to change the cable but it is not possible to do without damage the coil.

Looking the original tessoro manual I found this coil to be used in the photos.
Therefore this coil must work well with Eldo.
I do not understand where is the problem.

One way to solve it can be is to check the original PCB and look as are connected potenziometers, coil connector and all the rest.
Can be there are big differences between the original and the clone.
I am going to continue following this way but I can not remove my perplexity about the cable!

Tips?

[Sacchetti]

Hi,
I have solved the problem changing the coil.

However, Eldorado sometime produce a little sound in absence of target.
I have seen many video about TGSL that make the same.
I do not understand why and I did not found a way to eliminate this problem.
Do you have a proposition to solve it?

About the one I have built I am not satisfied at 50%.
The discrimination is enough for me but the main problem is how to get a better and clear sound when a little target is at 28cm or more.
I have seen some video of TGSL/IGSL with a perfect sound.
They are not the standard schematic but they was modified.
These modifications was already proposed from other users? Can I found them in some threads?
Sorry, it is impossible to read the entire forum, it take about one year.

I have tried to do some modifications to increase depth, after the simulation with LTspice.
The simulation are good but after in practice I did not get the result searched.
I have tryed to increase sensibility but without success. Nothing is changed.
These modifications was already proposed from other users? Can I found them in some threads?

I have read all the thread relative to "Tuning and troubleshooting of TGSL" and I have found in it many informations to tune the GB/DISC section.
Between TGSL and Eldo change frequency and other details but the schematic are very similar.
I found it a very nice thread.

I am going to sleep, sorry see you tomorrow.