Voodoo Main Discussion

[MartyJ1963]

@aa1ww,,,Very nicely put,,and and that's what I love about this forum - We're all here wth the same hobby/Interests and goals in mind,,,George has been kind enough (again) to gift all the Geotech members with another excellent project so we should build it as he designed and visualized it first, before any Mods/alterations etc,,I've learnt a lot already about this project just by being a part of this thread and I have a lot of respect for each person involved in building it/sharing their mistakes and successes/sharing ther experiences and knowledge. We all learn faster, and easier by being considerate and sharing. Thanks, Marty.

[SilverSurfer17]

I looked up info on the microchip the highest its been ran is over 80khz with 6 volts and 9600 baud rate when you find a good run chip but according to everyone in here it does nothing of any good to overclock i was hoping to speed up the what i guess is called flyback so i could move faster with the detector like ive seen some mounted to the back of four wheelers so i guess ill have to build it and figure it all out myself i just got my box of parts from Digikey and my Bose Headphones i scored for $14 bucks just waiting on my pickit and board ����

[ivconic]

30 from 33 pages of this topic has nothing to do with the subject.
So few of us invested money, time and energy in book and making voodoo and so much of just everybody comes here and talks the most idiotic talk.
Meantime... admins are occupied with rolling thumbs and sitting near the chimney... probably waiting Santa to do their job.
Usually a piece of coal is only reward for such behavior.
Good old times.
Hopefully this year will never repeat again.

[ivconic]

Projects like this one should be in closed and limited forums, only one who bought a book to be able to join.
In the past Carl did something similar. At the time we didn't have particular project to focus on.
Now is perfect time to do something like that.
I am terrified to recognize amount of pure Communism present at admins and their strange ways of running a forum.
Letting idiots to take over the topic and change it's course so easy, without slightest resistance.
Carl are you alive? Are you still among us? What's got into you man?
Do something!

[Qiaozhi]

In all my time of chip burning this is the only time I can recall even hearing about the pickit 5 v problem, I use both PICkit2 and PICkit3, but I always remove the chip from the pcb and never had a problem, just set to 5 v and burn.

That's because you always remove the chip from the PCB.

[ivconic]

That's because you always remove the chip from the PCB.

Nobody with a clue upon that yet?
...
Explanation is quite simple, not all motherboards provides the same USB voltage.
USB voltage can vary from motherboard to motherboard.
Therefore the differences.
Also there is possibility of the differences in various Pickit versions and is it genuine or Chinese copy.
Simple gadget for simple truth:

https://www.aliexpress.com/item/32825823421.html

PIC18F4520 itself will not make any problems in supplying voltage range 2-5.5V.
High/Low programming voltage auto detection feature too.
So; PIC is not causing this problem obviously, Pickit most probably not... only answer left is motherboard voltage for USB.
I am glad Surfdetector made that video and showed how to make it work, it is valuable info for us non-PIC users.

[surfdetector]

I am glad Surfdetector made that video and showed how to make it work, it is valuable info for us non-PIC users.

It was my pleasure

[aa1ww]

Marty, Thanks. Coincidentally my copy of the book arrived today.
ivconic, sorry. I will be read-only in this thread until I build a Voodoo.
Qiaohzi/George, please add me to the list of those expressing thanks for your efforts and willingness to share with respect to both the The Voodoo Project and IMTD (I meant ITMD).
Best Wishes,
aa1ww

[ivconic]

Marty, Thanks. Coincidentally my copy of the book arrived today.
ivconic, sorry. I will be read-only in this thread until I build a Voodoo.
Qiaohzi/George, please add me to the list of those expressing thanks for your efforts and willingness to share with respect to both the The Voodoo Project and IMTD.
Best Wishes,
aa1ww

Actually... i was not referring my remarks to your appearance here.

[Qiaozhi]

Marty, Thanks. Coincidentally my copy of the book arrived today.
ivconic, sorry. I will be read-only in this thread until I build a Voodoo.
Qiaohzi/George, please add me to the list of those expressing thanks for your efforts and willingness to share with respect to both the The Voodoo Project and IMTD.
Best Wishes,
aa1ww

[SilverSurfer17]

Does this guy complain about everything ? Cheer up biddy life is to short to be so salty all the time also its not good for your health

[lamoiz]

hi, not had a lot of time to work at the moment but, I did work a little bit anyway .. So, question, in your opinion ... who is the winner in the photo ?? I have the answer!
for information, all tested with the same capacity of 21.6nf, and make all the same values or almost. the DD tx = 370uh Rd 550r RX = 11.11mh. Omega TX = 355uh Rd = 400r RX 10.96mh, and superD TX 389uh Rd 550r Rx 10.6mh (5.3 + 5.3) the idea of all this is to share the experience and value if one shape is better than another.
they are also made with the same wires of Litz 175/46 on the TX and 0.18mm on the RX otherwise it does not make sense ...

[ivconic]

hi, not had a lot of time to work at the moment but, I did work a little bit anyway .. So, question, in your opinion ... who is the winner in the photo ?? I have the answer![ATTACH]54086[/ATTACH]
for information, all tested with the same capacity of 21.6nf, and make all the same values or almost. the DD tx = 370uh Rd 550r RX = 11.11mh. Omega TX = 355uh Rd = 400r RX 10.96mh, and superD TX 389uh Rd 550r Rx 10.6mh (5.3 + 5.3) the idea of all this is to share the experience and value if one shape is better than another.
they are also made with the same wires of Litz 175/46 on the TX and 0.18mm on the RX otherwise it does not make sense ...

Probably superD?
Can't do what you done because can't obtain litz wire.
Omega probably discriminates best but having lowest depths.
I tried DD and i am not satisfied.
I think the concentric coplanar coil will be the best choice for this detector.
Last night i dismantled White's Black Max 950 coil. Bad luck, i destroyed RX coil.
It was faulty already, cable breaks and once i opened it; i founded out that those two copper "rails" are also broken.
So it is not that much of a lost as it would be with some new coil.
But the way how White's coil was fine balanced with bucking coil and one lose turn over; makes me wonder about its usability in this project.
Since TX coil is in matter; bucking coil and lose turn will present a problem for PI TX.
Qiaozhi has positive experience with Troy coil, but that coil is fine balanced the same way as White's, having bucking coil and probably one or few lose turns over.
It will work alright in mixed mode as IB... but it shouldn't work alright in PI mode... at all.
Along with bucking coil it is closest to "8" coil type. I saw several previous attempts with such designs and i haven't see much of a performances so far.
This project needs its own coil design.
So you are closest to it with your attempts.
...
Would be interesting to see inner morphology of TDI coils...

[ivconic]

... other words... how to make concentric coplanar coil without bucking coil and lose turns?
I guess Eric has probably tried that in his rich long lasting career.
Simple two mono coils, slightly different diameters, no bucking coil.
Should work fine in PI mode. Questionable in IB mode.
...
I purposely am not mentioning ML coils. I opened all of those older series.
Without rich litz wire is pointless to make any attempts.
ML coils are working just fine though.
So maybe is good idea to try to obtain one of those.
...
Bottom line...
along with all opened issues by now; adding a coil "issue" makes this project totally abstract.
It is indeed interesting idea, interesting approach, no doubts about that.
But it has no bright future in diyers area.
Too many open issues to solve.
Alright, many will say it is doable, it is working already. Ok. But that's only in limits of theory and on the bench testings.
Even my deceased grandma can take soldering gun and solder all the components on pcb.
Also can eventually flash PIC.
Also can wound up some "coil".
But that's still too far away from serious proper use on the real soil, on the real sites.
Too many opened issues. Too many questions.
Patent office is pretty much fed up with such splendid ideas already.
Sour attitude from me?
I would say; realistic.
Let this be last bad thing that i "contributed" here with this outgoing horrible year.
God is my witness; i was indeed enthusiastic upon this.

[lamoiz]

Probably superD?
Can't do what you done because can't obtain litz wire.
Omega probably discriminates best but having lowest depths.
I tried DD and i am not satisfied.
I think the concentric coplanar coil will be the best choice for this detector.
Last night i dismantled White's Black Max 950 coil. Bad luck, i destroyed RX coil.
It was faulty already, cable breaks and once i opened it; i founded out that those two copper "rails" are also broken.
So it is not that much of a lost as it would be with some new coil.
But the way how White's coil was fine balanced with bucking coil and one lose turn over; makes me wonder about its usability in this project.
Since TX coil is in matter; bucking coil and lose turn will present a problem for PI TX.
Qiaozhi has positive experience with Troy coil, but that coil is fine balanced the same way as White's, having bucking coil and probably one or few lose turns over.
It will work alright in mixed mode as IB... but it shouldn't work alright in PI mode... at all.
Along with bucking coil it is closest to "8" coil type. I saw several previous attempts with such designs and i haven't see much of a performances so far.
This project needs its own coil design.
So you are closest to it with your attempts.
...
Would be interesting to see inner morphology of TDI coils...

well !! once again Ivica won! and once again I totally agree with you. on everything you just wrote. Totally. So the omega has a very good selectivity, and a good precision, the DD has a good detection distance, but is less sensitive on small objects, especially in Gold, 3grm at 15 cm .. in hybrid mode, but it measures 37cm diameter ... The best, distance / dimension ratio is the super D, the same mass of gold is detected at 20 cm, while its total width is 25 cm. For PI mode, the fastest is the DD, with 6.5us, then the super D with 8.5us, far behind the omega with 15us. like you, I think the solution is in a coplanar coil, in an rx / tx / rx- sandwich ... this subject is rather complex for the coil, beginners will have a hard time, and with a commercial coil I think the The results will be average. We will have to finish this bizarre year really quickly. Ivica, too bad we are not closer in distance, I think we will have shared a good drink together. Cheers, man.