Voodoo Main Discussion

[Qiaozhi]

it going....[ATTACH]53782[/ATTACH]

[zakari]

hi all
lamois congratulate.
your perseverance is very good.
i am sure you and george and godigit1 will make the excellent loop for this detector.

best regard
zakari

[gurdal]

it going....[ATTACH]53782[/ATTACH]

very good

[lamoiz]

it going....

[godigit1]

Great job on the Coil Godigit! Looking forward to seeing your results. When you have time, could you give us a rundown on the build process of your new coil please? I'd like to have a go at it too,,,Thanks, Regards, Marty.

Hi Marty,
Thanks for posting your progress along the way between you and Lamoiz breaking the ground it makes this project easier.

Ill get some coil shots for you I had to play mechanic this weekend but I made a 18 inch dual field d to try on the minipulse.

Need to see if the coil works in practice, it looks good on the genny.

Best

[Qiaozhi]

I did not gave to much attention to this thread as i have other projects going but for sure caught my eye and in the future i will give a try. Congrats George for this big step and I'm sorry if my question was already asked.
What performance has this hybrid detector? PI depth/vlf depth, sensibility, discrimination at the lower limit for pi depth, reactivity (or target separation)and most important GB. Few words please. thanks

Discrimination is to the full depth of the PI. Iron does not break through after a certain depth like it [infamously] does with the old Fisher 1265/1266 detectors. Target separation is an area that received much attention during development, and Voodoo is designed to find non-ferrous targets hiding amongst ferrous trash.
Voodoo also handles moderately mineralized ground very well. There is no requirement to manually ground-balance, as explained in detail in the book.

I don't like to get into debates or arguments about depth comparisons as there are too many factors to take into account. There's also the issue of air tests versus in-ground tests that are not particularly relevant when comparing PIs with VLFs. As I said in a previous post, it's horses for courses.

[Qiaozhi]

R30 tp3 tp1..mini 1.6v .. impossible to zero, there's something I'm doing wrong ..

That's odd, because looking at your scope image of TP3 it already appears to be settling close to 0V.

[ionut_mtb]

I did not gave to much attention to this thread as i have other projects going but for sure caught my eye and in the future i will give a try. Congrats George for this big step and I'm sorry if my question was already asked.
What performance has this hybrid detector? PI depth/vlf depth, sensibility, discrimination at the lower limit for pi depth, reactivity (or target separation)and most important GB. Few words please. thanks

[lamoiz]

thank you very much George.

R30 tp3 tp1..mini 1.6v .. impossible to zero, there's something I'm doing wrong ..

[lamoiz]

Adjust R30 so that the signal at TP3 settles near 0V.
R22 is the gain adjustment for the DISC channel. Simply turn the preset to its lowest resistance setting for initial testing. The adjustment is provided in case you want to experiment with a higher gain setting. This preset is discussed on page 75.

thank you very much George.

[lamoiz]

Try rotating the coil around, vertical as well as horizontal. Apart from the interference it looks OK to me.

yes I do not know where the interference comes from, I am in the workshop, I do not know ..

[Qiaozhi]

good evening George,
Could you tell us more about the R30 and R22 trimmer, how to properly adjust R30 offset and how to properly adjust R22 ...? (with a screwdriver ... yes ...) where should we measure and how much?
thank you.

Adjust R30 so that the signal at TP3 settles near 0V.
R22 is the gain adjustment for the DISC channel. Simply turn the preset to its lowest resistance setting for initial testing. The adjustment is provided in case you want to experiment with a higher gain setting. This preset is discussed on page 75.

[lamoiz]

good evening George,
Could you tell us more about the R30 and R22 trimmer, how to properly adjust R30 offset and how to properly adjust R22 ...? (with a screwdriver ... yes ...) where should we measure and how much?
thank you.

[Qiaozhi]

les photos
[ATTACH]53769[/ATTACH][ATTACH]53770[/ATTACH][ATTACH]53771[/ATTACH][ATTACH]53772[/ATTACH]

Try rotating the coil around, vertical as well as horizontal. Apart from the interference it looks OK to me.

[lamoiz]

les photos