Tesoro Eldorado on the bench

[Sacchetti]

dot forget make video

Ok but it is normal, about 28cm for every coin in air. Some coin a bit more.

I expected more and searched a way to get 40cm but without obtain this objective.
I am disappointed, a little frustrated.

[enjoykin4]

Tesoro Eldorado Super MOD by Игорь Барановский !!

Tesoro Eldorado Super MOD by Игорь Барановский !! Two Eldorados built and ready for gold prospecting All info search here:Металлоискатель "Tesoro Eldorado"http://vk.com/topic-33752123_28990794?offset=3200#/topic-33752123_28990794?offset=5840Regards !!enjoykin4

[Maurizio2]

Dear friends,
I took the EldoradoQT file again to do some simulations.
The first problem I had is that the potentiometer is missing in the standard LTspice library. So I replaced it with two resistors, setting one to the value of one ohm close to zero (R1) and the other (R21) to the maximum value of the potentiometer, alternating them in order to see in the simulation what happens at the minimum and maximum.
The second problem is that the zener 1N749 is missing in the library so I replaced it with a 1N750 which has the closest value.
Finally the third problem concerned the TIS75 FETs which are not there and I replaced them with 2N4393s.
To have everything visible on a single scale I put: K1 Ltx Lrx 6.3e-3 instead of 6.3e-5 (See Target Coupling in Image1).

However, from what I see there are no phase differences between TX and RX while in reality in Eldorado RX must be delayed by 20° compared to TX.
Does anyone know how to introduce this delay in LTspice?
See Image2.

With normal non-mineralized soil like where I come from, the GB is set more or less in the middle. By adjusting the GB to 50% (R9 = 50Kohm) I saw that the discrimination at idle is delayed compared to the GB by about 120° (Image3). While at most it touches 180° (Image 4 and Image5).

Can anyone tell me if I'm doing it wrong and if so, where?

[dbanner]

Maybe this can help

[Carl-NC]

However, from what I see there are no phase differences between TX and RX while in reality in Eldorado RX must be delayed by 20° compared to TX.
Does anyone know how to introduce this delay in LTspice?

You can add some capacitance in parallel with R26 to delay the RX signal. At 10kHz, 58pF will give 20°.

[Maurizio2]

Maybe this can help

Hi Dbanner!
Thank you, very much.
Please can you add also the 1N749 zener diode library? Because I get this error:

[Maurizio2]

You can add some capacitance in parallel with R26 to delay the RX signal. At 10kHz, 58pF will give 20°.

Hi Carl!
Thank you.

This is a good work-around but I don't know if it is possible to calculate capacitance from degree...
However, also this solution is very interesting.

[dbanner]

Download expanded library here, it has diode 1N749

http://ltwiki.org/files/LargeCollection.zip

[Maurizio2]

Download expanded library here, it has diode 1N749

http://ltwiki.org/files/LargeCollection.zip

Great!

[Sean_Goddard]

If anyone ever decides to respray a "chocolate" Tesoro, the best match I have found is Mercedes "Erdbrun" (Earth brown).

[paku]

Tested Video Working Tesoro Eldorado By Ivconic
Thanks To Ivconic

Old Video ReUpload

[paku]

https://youtu.be/fIdnMSwfVNc?si=pAWRKnu4BFsS4Aem