Voodoo Main Discussion

[MartinB]

Yes . 3 superimposed coils Rx- / Tx / Rx +. I made one for the test. But not had good functioning. failed to make the Rx "invisible" on the oscilloscope. If anyone here knows this method, I'm very happy if he explains how to do it, or what I've done wrong ... but for voodoo it would be a good idea.

Could you post a photograph of what you are seeing on your scope?

[SilverSurfer17]

I didn't know carbon fiber was conductive i know it uses some kind of 2 part epoxy ill have to check it i was going to make a form get it all tuned then wrap it with brown paper bag painted with that guitar paint then wrap something to insulate it then wrap it in carbon fiber then epoxy it all in place where its tuned i can make a extra leg for extra bucking coil wires im still kinda unsure on the bucking coil if thats a separate coil or is that extended of the outer loop i think its outer and its using the bucking coil to help the inner pickup the signal the diagram im looking at uses three different colors for coils it also says keep extra wire because you will have to add a few turns to the inner coil because the bucking coil will change it after the bucking coil is added

[dfbowers]

Yeah a 10 inch is to big i stretched it already from 7 because i know 10 is suppose to be a perfect size but for where im gonna be using it thats to big and yes ive seen some spools made out of foam can these Coils be covered with carbon fiber or does the carbon affect the coil ?

10 inch makes pinpointing tough.. plus you get to the point of diminishing returns on size vs depth and weight. I Donno about carbon fiber but since its conductive there might be trouble.
Also the open center coil introduces a new challenge in that you have limited area to make a fine tuning loop at the end of the bucking coil. I have been just doubling back through one of the spokes when the coil gets to a null.

[SilverSurfer17]

Yeah a 10 inch is to big i stretched it already from 7 because i know 10 is suppose to be a perfect size but for where im gonna be using it thats to big and yes ive seen some spools made out of foam can these Coils be covered with carbon fiber or does the carbon affect the coil ?

[dfbowers]

He makes them. All you need to do is contact him.

I dont think Hayes is in business anymore.
I can send 10 inch shells to anyone who might want one. I have not made any covers yet and mine are meant to be epoxy filled as they are only 1/16 ABS. Tabs are 17mm made for Whites lower rods. If there is enough interest I can make an 8 inch Black or white.
One essential thing I ran into is spool is needed for the RX as it becomes a handful to wind a bucking coil without one. I may be able to provide parts for a spool too..

[SilverSurfer17]

When you enter radius into the cc do you minus the thickness of the coil like if the radius is 4 inches for a 8 inch coil do you use 4 inches or like 3 1/2 in the cc to account for the thickness of the coil because i noticed George used a 3 inch for his 7 inch instead of 3 1/2 diameter or was it so it fit correctly in the shell he had ?

[SilverSurfer17]

Where the coil mounts to the pole is called the yoke ? https://www.seriousdetecting.com/pro...tor-8013-0044/

[SilverSurfer17]

Yeah i just looked him up then realized who he was after seeing his pic by any chance do you know anywhere that sells the plastic piece that goes in the poles for the coils ive been keeping a eye out at detector sites and haven't come by one ?

[surfdetector]

The only concentric shell i could find was all closed in and one hole in the center and i wanted a open one like in the picture ill have to figure out how to hunt him down on here lol

He makes them. All you need to do is contact him.

[SilverSurfer17]

The only concentric shell i could find was all closed in and one hole in the center and i wanted a open one like in the picture ill have to figure out how to hunt him down on here lol

[surfdetector]

Anybody know where you can find these shells this is the only one i could find and all the links don't work https://picclick.com/8-Metal-Detecto...776327553.html [ATTACH]54257[/ATTACH] thanks for any help

dfbowers (member here) produces very good quality shells.

[SilverSurfer17]

Anybody know where you can find these shells this is the only one i could find and all the links don't work https://picclick.com/8-Metal-Detecto...776327553.html thanks for any help

[ivconic]

when i print coil former i do it from two pieces, and after i glue together with superglue. In this way i don?t need to scrap the overhang support structure, which i find annoying and the surface of the part is not smooth. Also i keep the layers thickness about 1.5mm resulting in less weight(anyway this willbe covered in epoxy). Coil housing is from BG, i did not print them yet.
Thank you all for your involvment.

Yes sometimes i do the same. Magnetometer enclosure i did from several pieces and glued together.
...
This turned out surprisingly well, it took me half an hour to remove supports though:

[lamoiz]

Which/what coil are you calling "pancake" ?

Yes . 3 superimposed coils Rx- / Tx / Rx +. I made one for the test. But not had good functioning. failed to make the Rx "invisible" on the oscilloscope. If anyone here knows this method, I'm very happy if he explains how to do it, or what I've done wrong ... but for voodoo it would be a good idea.

[ionut_mtb]

I haven't tried such coil so far.
Balancing seems too complicated for me.
Even "CC" coil is too complicated to balance... in these conditions.
Truth is; the other day i prepared former for CC coil.
I had enclosure from before, i only 3D printed former for RX and former for bucking coil.
Enclosure is big enough to fit 25-27cm TX coil.
And dimensions of RX and bucking former are on the pics:

when i print coil former i do it from two pieces, and after i glue together with superglue. In this way i don’t need to scrap the overhang support structure, which i find annoying and the surface of the part is not smooth. Also i keep the layers thickness about 1.5mm resulting in less weight(anyway this willbe covered in epoxy). Coil housing is from BG, i did not print them yet.

Thank you all for your involvment.