Voodoo Main Discussion

[lamoiz]

thank you very much George.

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

[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

[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.

[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.

[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

[lamoiz]

it going....

[gurdal]

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

very good

[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

[Qiaozhi]

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

[asolone]

can you show some video of this metal detector in operation? I'm very curious

[MartinB]

Hi lamoiz
I am also making this coil when time allows. Interesting to note that you have stepped the TX coil upwards. Is there a particular reason for this?

[lamoiz]

Hi lamoiz
I am also making this coil when time allows. Interesting to note that you have stepped the TX coil upwards. Is there a particular reason for this?

you are an observer! this is just for the shape and stiffness. this also affects the inductance, but very little. what are the dimensions of your coil?

[godigit1]

you are an observer! this is just for the shape and stiffness. this also affects the inductance, but very little. what are the dimensions of your coil?

H Lamoiz,

Very clean coil ! Beautiful!

Curious what are the values of your coil?
And what is its speed when you get a chance to scope it?
Thanks

[lamoiz]

H Lamoiz,

Very clean coil ! Beautiful!

Curious what are the values of your coil?
And what is its speed when you get a chance to scope it?
Thanks

hi Godigit, the TX coil is 430uh, and its damping resistance @ 650r. wire 0.8 silicone. The two RX are respectively 5.5 mh or a series total close to 11mh ... wire 0.18; all tuned with a capa 21.6 nf (@ 20 ?) .. the purpose being to have a frequency of 10.5 khz, (10.32, to be precise)

[lamoiz]

in parallel with this coil construction, i made a large omega with oval center, the tx and rx values are close to this one, but the difference is the use of litz wire for tx.