Tesoro Eldorado VDI

[dgm]

Hi I wanted to ask the Guru if it was possible to attach a VDI metal detectors Eldorado . Thank you

[Davor]

Tesoro adjusts phase at a switching level, so Disc channel phase is not fixed. Therefore you may use VDI, but the numbers shown on it will depend upon your Disc. adjustment.

[dgm]

Davor Grazie per la risposta, avrei bisogno di sapere dove collegare il VDI al circuito.

[Qiaozhi]

Davor Grazie per la risposta, avrei bisogno di sapere dove collegare il VDI al circuito.

Please read the forum rules -> Basic Rules of the Forums
and make your posts in English.

[dgm]

Davor Thanks for the answer , I would need to know where to connect the VDI to the circuit.

I apologize for the language.

[Davor]

Please attach a schematic that you follow - if you have a schematic at hand.

[dgm]

Tesoro Eldorado schematica

[Davor]

I'd put it like this

[dgm]

Thanks so much for your response.

[Davor]

No problem.
Have in mind that it will give meaningful reading only at a single position of discrimination potentiometer.
A VDI is reading an angle between two demodulated vectors. While GB is mostly the same for nearly all VLF detectors, at least on easy terrains, Tesoro shifts phase at the switching detector level. Fisher 1265 descendants do discrimination a bit differently. The discrimination phase there is fixed on the switching detectors, and it only gets shifted by addition of GB-ed demodulated signal in a baseband demodulated path. This variant gives more consistent and straightforward VDI solution, provided you take phases prior to the discrimination potentiometer.

What approach is better? I'd say both are basically the same in a classic VLF. The later approach is far better solution for a quadrature demodulation followed by a microcontroller, as the VLF frequency part is completely invariant for the low frequency processing.

Although I'm very happy with my IGSL, which is basically a Tesoro approach, I see many advantages of a Fisher 1265 approach.

[Oatz]

Man I would love a VDI on my Compadre. Hunt in all metal looking for small chains and micro jewelry while being able to see whats beeping would be great. And it has the fixed GB.