Tesoro Eldorado

[Qiaozhi]

Hello,

Now i thinking about, what battery type use for Eldorado.
And I think the best will be...

Cellphote battery

3,6v -> 12V

hmm, I have a BST-33 3,6V 750mAh Li-Poly battery for Sony Ericsson K510i.

I think about use a MC34063E DC-DC CONVERTER.

In Step-up configuration.

Maybe this will be work, battery like BST-33 cost in Poland about 5-15PLN (2-6$) per one.

My Eldorado eat some about 25mA

But I thinking about how much eat will power converter, to produce 12V and 80mA.

2-3 Cellphone batts in wallet and go hunting with Eldorado

Tesoro detectors will generally work for about 40 hours or more on a set of alkaline batteries. You can buy these by the bucket load, so it's not really worth messing about with rechargeables.

[remus_im]

I built the Eldorado, But Not the performance is the one you specified. Discrimination does not work. in all metal, detects a coin to 20 cm.
I want to rewind the coils, and will ask if you can use this type of cable, and connections shown in the schematic to connect the coils?
The detector is built after Ivconic scheme, thanks this way.

[remus_im]

I finished my Eldorado, it is very good, in All metal mod detects a 2 cm coin at 30 cm in ground, but its senzitive to potery and ceramics, , whi?
the coil is DD type, 28 cm.
sorry for my bad english.

[remus_im]

nobody knows anything about this?
its a VLF not PI, why ceramics is detected?

[Qiaozhi]

nobody knows anything about this?
its a VLF not PI, why ceramics is detected?

Have you set up the ground balance correctly?

[sadowski25PL]

Hello,

I have big problem with My eldorado...

Before I try another cable, I use a LIYCY 6x0,25 cable with copper shield.
On that cable in air test for 2cm coin I have some about 32cm, Discrimination works very good.
But when I try VGA cable from computer monitor...

Tx voltage fall down from 15V to 8,3V o.O
Receiver works fine, but Transmitter dead.
Max in airtest is 10cm for beer can ( full ).

Can you tell me where is the problem ?

[sadowski25PL]

Hello again,

Now, some updates about building My Tesoro Eldorado

First photos:

Eldorado No.1:




Eldorado No.2:




For coil I use a tensometric cable, HBM CABA2 with double shield ( main shield and pair shield).
In Eldorado No.1 use TL081
In Eldorado No.2 use LM308H

[arion]

Please help. How to prepare the coils? What are the correct parameters? What is the diameter of the coils? How to turns the transmitter and the receiver coil?
What is the inductance and resistance? Which is better, the DD or OO? Sorry for the bad English. Thank you.

[lanzi]

hi Ivconic.
I need your help for a very some question.
Please contact me
I am french and my name is florian
lanziflorian@yahoo.fr
Merci beaucoup

[kelt]

Hi ivconic, i almost finish my metal detector tesero eldorado made in you circuit and i ask you what capasitor you put on pin 8 lm308

[ivconic]

Hi ivconic, i almost finish my metal detector tesero eldorado made in you circuit and i ask you what capasitor you put on pin 8 lm308

Oh it's been long time ago, i can't be sure. I am listing now my files to check.
There are two pcb's i done. At first one i put 100pf and on second one seems i omit capacitor?
LM308 usually need external compensation and usually it is 100pf.
But right now i am not sure to tell you why there is no cap at all at my second pcb!??

[ivconic]

Here are both pcb versions i done than.
Both are working good (as i recall).

[emoxristov]

how can I replace 2N2907

[Davor]

Easy. Use just about any PNP small transistor. BC327 is a better choice.

[emoxristov]

Friends analogue TIS 75 ??